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INDEX BY VALVE MODEL NUMBER 

® 

HYDRAFORCE 

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Housings 

& Accessories 

Technical 

Reference Info. 

Note: For your convenience, PDF catalog page files for individual products 

can be found in the folder named “Pags-pdf” which is located at the root directory 

level (topmost level) of this CD. Files are grouped in subfolders representing the 

sections of the catalog. File names are based on the catalog page numbers.

COILS AND ELECTRONIC CONTROLS 

Standard Coils and Proportional Valve Coils 

WHY HYDRAFORCE STANDARD COILS OUTPERFORM COMPETITIVE UNITS 

High Quality Materials 

HydraForce coils are made with 

high quality, Class H magnetwire 

and insulation materials. 

More Ampere Turns 

More copper wire turns deliver more 

magnetic flux per current input. 

Rugged Casing 

Coils are housed in a durable 30% 

glass-filled thermoplastic casing, 

providing a rigid base for coil 

terminations. 

Superior Frame Density 

Thick iron surrounds the 

copper winding, increasing 

the coil’s flux density and 

therefore its power as an 

electromagnet. 

Multiple Termination 

Options 

HydraForce offers many 

standard types of electrical 

connections, and will 

consider OEM requests 

for special terminations. 

DC Windings 

All windings are DC. AC service coils 

are internally full-wave-rectified, so 

cartridges are voltage-interchangeable 

and do not exhibit AC “buzz” or suffer 

burn-out due to partial armature shift. 

HydraForce DC coils are UL Listed 

under File #AU2326. 

Custom Coils 

HydraForce can provide windings 

precisely-tailored for special OEM 

applications. Some of the common 

windings are listed on the following 

page; consult the factory if these do 

not meet your requirements. 

Heat Rise 

Rather than using heat sinks or 

external cooling methods, 

HydraForce uses larger coils for 

lower heat rise, stronger electromagnetic 

force and longer coil life. 

HydraForce coils can be operated 

continuously at ambient temperatures 

to 100°C without challenging 

the coil’s insulation system. 

Note: Some coils may differ in construction from this illustration. 

3.200.1

COMMON WINDING SPECIFICATIONS 

® 



Volts 

6* 

10 

12 

20* 

24 

30* 

36 

48 

72* 

110 

24 

115 

230 

08, 80 Size Coil Data 

(14.7 Watts) 

Resistance 

(DC) @ 20°C 

Ohms 

*Special Order Coils 

DC Service 

2.46 

6.8 

9.8 

27.2 

39.3 

61.4 

88.3 

156.6 

352.4 

823.1 

AC Service 

31.2 

765.5 

3035.0 

Initial 

Current Draw 

Amps 

2.44 

1.47 

1.22 

0.74 

0.61 

0.49 

0.41 

0.31 

0.20 

0.13 

0.61 

0.13 

0.06 

10, 38, 58, 12, 52, 16, 56 Size 

Coil Data (20 Watts) 

Volts 

6* 

10 

12 

20* 

24 

30* 

36 

48 

72* 

110 

24 

115 

230 

Resistance 

(DC) @ 20°C 

Ohms 

DC Service 

1.8 

4.8 

7.2 

19.0 

28.8 

43.2 

64.8 

110.2 

249.8 

605.0 

AC Service 

23.6 

568.0 

2304.0 

*Special Order Coils 

Initial 

Current Draw 

Amps 

3.33 

2.08 

1.67 

1.05 

0.83 

0.69 

0.56 

0.44 

0.29 

0.18 

0.83 

0.17 

0.09 

Volts 

12 

24 

Volts 

10 

12 

20 

24 

70 Size Coil Data 

Proportional Coil Data 

Resistance 

(DC) @ 20°C 

Ohms 

5.0 

20.0 

Nominal I-Max. 

Current Draw 

Amps 

1.50 

0.75 

EHPR Coil Data 

Proportional Coil Data 

Resistance 

(DC) @ 20°C 

Ohms 

3.1 

5.4 

12.5 

21.7 

Nominal I-Max. 

Current Draw 

Amps 

1.50 

1.20 

0.75 

0.60 

COIL INFORMATION 

• AC service coils are internally rectified, and can be used in 50 

or 60 cycle (Hz) lines. 

• Special voltages and terminations are available for OEM 

applications; consult factory. 

• Coil should always be installed with lettering facing up. 

• Standard coils are not hermetically sealed. For applications 

requiring water or weather resistant coils, see pages 

8.250.1-2 and pages 3.400.1-6 

• AC voltage service with transient surges over 1000 volts may 

require that a varistor be placed in parallel at the coil. 

Voltage Varistor Part No. Joule Rating Required 

GE: V150LA10A 

115 Siemens: S10R150 45 minimum 

or equivalent 

GE: V250LA40A 

230 Siemens: S20R250 130 minimum 

or equivalent 

COIL ACCESSORIES 

Coil Ground Strap 

for DS Coils 

P/N 6502200 

DIN 43650 

1/2" Conduit to Connector 

P/N 6110001 

DIN 43650 

Cable Gland PG 9 

(7 mm nominal cable diameter) 

P/N 6110002 

or Cable Gland PG 11 

(9 mm nominal cable diameter) 

P/N 6110005 

3.200.2



SERIES 08, 80, 88, 98 COIL INFORMATION 

S 

Dual Spades 

SAE J858a 

L 

Dual Leads 

18 Gauge 

Optional 36-inch leads 

available. Consult factory. 

P 

1/2" Conduit & 

18 Gauge Leads 

Part Number Suffix 

Voltage S L P 

10 VDC 

12 VDC 

24 VDC 

36 VDC 

48 VDC 

6301010 

6301012 

6301024 

6301036 

6301048 

6302010 

6302012 

6302024 

6302036 

6302048 

6305012 

6305024 

110 VDC 

*24 VAC 

*115 VAC 

*230 VAC 

6315024 

6315115 

6315230 

*Rectified 

3.200.3

SERIES 08, 80, 88, 98 COIL INFORMATION 

® 



1.43 

36.3 

G 

DIN 43650 

Connector 

W 

Dual 18 Gauge Leads with 

Weather Pack ® Connector 

For use with Packard part no. 12015792 

male plug 

K 

Kostal 

Connector 

DK Coils; U.K. 

availability only. 

DR 

Integral Deutsch 

Connector 

DR Models without Diode 

DR/D Models with Diode 

DR/Z Models with Zener Diode 


Voltage 

10 VDC 

12 VDC 

24 VDC 

36 VDC 

48 VDC 

110 VDC 

*24 VAC 

*115 VAC 

*230 VAC 

*Rectified 

G 

6306012 

6306024 

6306036 

6306048 

6306110 

6316024 

6316115 

6316230 

W 

6309410 

6309412 

6309424 

6309436 

6309448 

K 

6348812 

6348824 

DR DR/D DR/Z 

4301512 4301872 4301852 

4301524 4301874 4301854 

3.200.4



SERIES 10, 12, 16, 38, 58 COIL INFORMATION 

S 

Dual Spades 

SAE J858a 

L 

Dual Leads 

18 Gauge 



P 

1/2" Conduit & 

18 Gauge Leads 


Voltage S L P 

10 VDC 

12 VDC 

24 VDC 

36 VDC 

48 VDC 

6351010 

6351012 

6351024 

6351036 

6351048 

6352010 

6352012 

6352024 

6352036 

6352048 

6355012 

6355024 

110 VDC 

*24 VAC 

*115 VAC 

*230 VAC 

6365024 

6365115 

6365230 

*Rectified 

3.200.5

SERIES 10, 12, 16, 38, 58 COIL INFORMATION 

® 



1.76 

44.6 

G 

DIN 43650 

Connector 

W 




male plug 

DR 

Integral Deutsch 

Connector 

DR Models without Diode 

DR/D Models with Diode 

DR/Z Models with Zener Diode 

Voltage 

10 VDC 

12 VDC 

24 VDC 

36 VDC 

48 VDC 

110 VDC 

*24 VAC 

*115 VAC 

*230 VAC 

*Rectified 

G 

6356012 

6356024 

6356036 

6356048 

6356110 

6366024 

6366115 

6366230 


W DR DR/D DR/Z 

6359410 

6359412 

6359424 

6359436 

6359448 

4301612 

4301624 

4301892 

4301894 

4301862 

4301864 

3.200.6


Proportional Valve Coils 

SIZE 70 COIL INFORMATION 

S 

Dual Spades 

SAE J858a 

L 

Dual Leads 

18 Gauge 

G 

DIN 43650 

Connector 

Voltage 

12 VDC 

24 VDC 


S L G 

6507112 6507212 6507612 

6507124 6507224 6507624 

3.200.7

® 


Proportional Valve Coils 

SERIES EHPR08 COIL INFORMATION 

1.19 

30.2 

0.78 

19.9 

18.00 

457.2 

0.78 

19.9 

1.45 

36.8 

0.98 

24.9 

0.78 

19.9 

9.5 

241.3 

1.23 

31.2 

DIA. 

1.53 

38.9 

.050 

12.7 

INCH 

MILLIMETRE 

S 

Dual Spades 

SAE J858a 

L 

Dual Leads 

18 Gauge 



G 

DIN 43650 

Connector 

W 




male plug 

Voltage 

12 VDC 

24 VDC 


S L G W 

6451112 6451212 6451612 6451512 

6451124 6451224 6451624 6451524 

3.200.8


Standard Coil Weather-Proofing (obsolete Jan.1, 2002) 

INTRODUCTION 

For SV Series valves, the standard coil weather-proofing 

method described here is being replaced by the new 

Series E Water/Weather Resistant Coils described on 

pages 3.400.1-7. However, the new Series E Coils are not 

currently available for most PV, TS or ZL Series Proportional 

valves (consult factory). The older method of 

weather-proofing described on these pages will continue 

to be available as service parts and for use on existing 

applications where coil performance or space limitations 

require it. 

Standard HydraForce coils are encapsulated and weatherresistant, 

having been successfully applied in many mobile 

and industrial installations where the coil is exposed. However, 

these coils are not hermetically sealed against moisture 

under all conditions. 

Standard HydraForce coils must be protected if both of the 

following conditions apply: 

• The coil is run continuously, causing heating of the materials 

and resultant separation of the plastic and metal parts in cooldown 

contraction. 

• Under the above if water is present and can pool at the top 

or bottom metal washer surface. 

Application experience indicates that higher voltage coils are 

more susceptible to damage from water due to thin wire 

diameters. Extra care should be given to specification for AC 

service applications. 

WEATHER-PROOFING METHOD 

All electrical devices are sensitive to water intrusion and must 

be insulated against contact if moisture is present. This is 

done by creating a barrier or blocking means to prevent 

intimate contact of the water and copper. 

The HydraForce weather-proofing system described here 

uses external fluorocarbon O-rings positioned and retained at 

potential entry points on the coil. Various sizes and types of 

solenoid cartridges require different installation methods as 

illustrated on the opposite page. Some of these are retrofitable, 

while others are not. See the table below. 

Model Group 

PV7x-xx 

SL08-22 

SL38/58-22 

SV08-20, 22, 24, 25, 26, 30, 31, 33, 

40, 41, 42, 44, 45, 46 

SV08-21, 23 

SV08-47A, 47C, 47D 

SV10-20, 22, 24, 25, 31, 33, 34, 

40, 41, 42, 43, 44, 45 

SV10-21, 23 

SV10-47A, 47B, 47C, 47D 

SV38/58-26 

SV58-20, 22, 24, 25, 30, 40, 41, 42, 44 

SV58-21, 23 

SV12-20, 22 

SV12-21, 23 

SV16-20, 22 

SV16-21, 23 

Armature 

Type 

Proportional 

Pull 

Pull 

Pull 

Push 

Push/Pull 

Pull 

Push 

Push/Pull 

Pull 

Pull 

Push 

Pull 

Push 

Pull 

Push 

Installation 

Type 

E/H 

A 

A 

A 

B 

C/D 

A/F 

B/G 

C/D 

NOTE: Torque weather-proofing nuts to 0.07–0.10 Nm (7–10 ft. lbs.) max. 

A/F 

A/F 

B 

A 

B 

A 

B 

Field 

Conversion 

Yes/All 

No 

Yes 

No 

No 

Yes/All 

No 

No 

No 

No 

No 

No 

Yes/All 

Yes/All 

Yes/All 

Yes/All 

Service 

Kit P/N 

6260145 

6260100 

6260130 

6260100 

6260105 

C-6260111 

D-6260106 

A-6260130 

F-6260110 

B-6260135 

G-6260115 

C-6260140 

D-TBD 

A-6260130 

F-6260110 

A-6260130 

F-6260110 

6260135 

6260130 

6260135 

6260130 

6260135 

3.250.1

® 


Standard Coil Weather-Proofing (obsolete Jan.1, 2002) 

A 

SVxx 

Pull-Type 

B 

SVxx 

Push-Type 

C 

SVxx-47 

Push/Pull-Type 

D 

SVxx-47 with Push/Pull 

Manual Override 

E 

PV7x 

Proportional 

H 

PV7x - Proportional 

w/Manual Override 

3.250.2


Series E Environmental Coils 

NEW SERIES E WATER-RESISTANT/WEATHER-RESISTANT SOLENOID VALVE COILS 

New Series E coils are the latest innovation in coil technology 

from Hydraforce. They are designed to meet the demanding 

requirements of mobile and industrial applications where 

weather resistance is required. Models with Deutsch and 

Metri-Pack ® integral connectors meet or exceed all IP69K 

standards for weather resistance, offering superior reliability 

under the most demanding conditions. Series E coils have 

passed what is known in the construction, agricultural and 

mobile equipment markets as the “thermal shock dunk test.” 

Series E coils feature a new coil winding technology that is 

perfect-wound and fully encapsulated. Deutsch and Metri- 

Pack ® connectors are molded into the coil encapsulation, 

assuring IP69K weather resistance. An external metal shell 

serves as the element to concentrate the magnetic flux for the 

coil winding and also functions as a rugged container for the 

coil. No O-rings or waterproofing kits are required. 

Models are available to fit most standard 08, 10, 12, and 16 

size valves. In most applications, these coils can be used to 

retrofit HydraForce valves already in field operation and will 

offer superior weather resistance. 

Thermal Shock Dunk Test Rated 

Series E coils with Deutsch and 

Metri-Pack ® connectors have 

passed what is known in the 

construction, agricultural and 

mobile equipment markets as 

the “Thermal Shock Dunk Test.” 

(See page 3.400.7 for a 

description of this test.) 

Easy Installation 

No O-rings, external 

sealing, or waterproofing 

kits required. 

IP69K Rated 

with Integral Connectors 

Deutsch, and Metri-Pack ® 

connector options are rated for 

IP69K. DIN, dual lead wire and 

dual spade connections are rated 

for IP65. (See page 3.400.7 for a 

description of ratings.) 

Fully Encapsulated 

Windings 

Perfect wound coils are fully 

encapsulated for zero leak 

paths when ordered with 

integral connector options. 

Field Retrofit-able 

In most cases, Series E 

coils can be used to 

replace existing coils on 

HydraForce valves 

already in operation. 

Rugged Metal Shell 

The rugged external metal shell 

provides exceptional protection 

against physical damage, 

ensuring durability under harsh 

operating conditions. 

High Temperature Operation 

Class H magnetwire and insulation 

materials allow high temperature 

operation and ensure long life under 

demanding conditions. Continuousduty 

operation up to 70°C and 115% 

of nominal voltage. 

Note: Some coils may differ in construction from this illustration. 

3.400.1

® 



08-SIZE SERIES E COILS 

1.40 

35.6 

Dual Coil for SV08-47 Valves 

1.43 

36.3 


1.41 

DIA. 

35.8 

1.41 

DIA. 

35.8 

1.43 

36.3 

2.92 

74.2 

1.43 

36.3 

2.92 

74.2 

INCH 

MILLIMETRE 

INCH 

MILLIMETRE 

EY 

IP69K Rated Coil 

Thermal Shock Dunk Test Rated Coil 

Metri-Pack ® 150 Connector 

(Mating Connector: Delphi Packard No. 12052641) 

ER 



Deutsch DT04-2P Connector 

(Mating Connector: Deutsch No. DT06-2S) 

EY Coil 

Part No. 

4300112 

4300124 

ER Coil 

Part No. 

4300312 

4300324 

Operating 

Voltage 

12 VDC 

24 VDC 

Resistance 

at 20°C 

8.6 ohms 

35.0 ohms 

Initial 

Current Draw 

1.4 amps 

0.7 amps 

Power 

16.8 watts 

16.8 watts 

Coil 

Weight 

136 g. (4.8 oz.) 

136 g. (4.8 oz.) 

Please note: Electrical specifications for Series E coils differ from those for standard HydraForce coils. 

(Refer to page 3.200.1 for standard coil specifications.) 

% OF RATED VOLTAGE 

120 

110 

100 

90 

80 

70 

60 

50 

CONTINUOUS DUTY OPERATING RANGE 

Minimum Voltage at the Coil Required for Pull-In 

32 cSt/150 ssu oil at 40°C 

Operating Range 

-40 -30 -20 -10 0 10 20 30 40 50 

AMBIENT TEMPERATURE (°C) 

60 70 

Retrofit Ordering Notes for 08-Size Coils 

Series E 08-size coils will fit all 08-size HydraForce valves except 

for the following models: SV07-xx, SV08-xxW (valves ordered 

originally with waterproof adapter), SF08-xx, SV80-xx, SV98-xx, 

TS08-xx, TS80-xx, TS98-xx, or any PV, ZL or EHPR series valves. 

Series E 08-size coils are slightly larger in diameter than 

standard HydraForce 08-size coils (0.11" larger), therefore they may 

not be suitable for retrofit applications or existing manifold designs 

where coil clearance is tight. For all retrofit applications, the coil nut 

(top nut) must be ordered separately. For retrofit applications on 

SV08-47 dual coil valves, a spacer is also required and must be 

ordered separately. Refer to page 3.400.6 for all retrofit applications. 

3.400.2



10-SIZE SERIES E COILS (Also for use on 12-Size Poppet Valves and 16-Size Poppet Valves) 

1.62 

41.1 


1.65 

41.9 


1.84 

DIA. 

46.7 

1.84 

DIA. 

46.7 

1.96 

49.9 

1.96 

49.9 

3.98 

101.1 

3.98 

101.1 

INCH 

MILLIMETRE 

INCH 

MILLIMETRE 

EY 





ER 



Deutsch DT04-2P Connector 

(Mating Connector: Deutsch No. DT06-2S) 

EY Coil 

Part No. 

4300212 

4300224 

ER Coil 

Part No. 

4300412 

4300424 

Operating 

Voltage 

12 VDC 

24 VDC 

Resistance 

at 20°C 

5.9 ohms 

24.0 ohms 

Initial 

Current Draw 

2.0 amps 

1.0 amps 

Power 

24 watts 

24 watts 

Coil 

Weight 

408 g. (14.4 oz.) 

408 g. (14.4 oz.) 

Please note: Electrical specifications for Series E coils differ from those for standard HydraForce coils. 

(Refer to page 3.200.1 for standard coil specifications.) 


120 

110 

100 

90 

80 

70 

60 

50 





-40 -30 -20 -10 0 10 20 30 40 50 


60 70 


Series E 10-size coils will fit all 10-size HydraForce valves as well 

as SV38-xx, SV58-xx, TS38-xx, TS10-xx, TS12-xx models. They 

can also be used with all of the following 12 and 16 size poppet 

valves: SV12-20, SV12-21, SV12-22, SV12-23, SV16-20, SV16-21, 

SV16-22, and SV16-23. Series E coils cannot be used with PV, 

ZL or EHPR series valves. 

Series E 10-size coils are slightly larger in diameter than 

standard HydraForce 10-size coils (0.11" larger), therefore they may 

not be suitable for retrofit applications or existing manifold designs 

where coil clearance is tight. For all retrofit applications, the coil nut 

(top nut) must be ordered separately. For retrofit applications on 

SV10-47 dual coil valves, a spacer is also required and must be 

ordered separately. Refer to page 3.400.6 for all retrofit applications. 

3.400.3

® 



12-SIZE SERIES E COILS (For 12 Size Spool Valves Only) 

1.77 

44.9 

1.81 

46.0 

2.19 

55.6 

INCH 

MILLIMETRE 

2.19 

55.6 

3.03 

76.8 

3.03 

76.8 

EY 





EG 

IP65 Rated Coil 

DIN 43650 Connector 

EY Coil 

Part No. 

EG Coil 

Part No. 

Operating 

Voltage 

Resistance 

at 20°C 

Initial 

Current Draw 

Power 

Coil 

Weight 

6964012 

6956012 

12 VDC 

4.3 ohms 

2.8 amps 

33.6 watts 

1 kg. (2.2 lbs.) 

6964024 

6956024 

24 VDC 

17.5 ohms 

1.4 amps 

33.6 watts 

1 kg. (2.2 lbs.) 

6964036 

6956036 

36 VDC 

34.8 ohms 

1.0 amps 

36.0 watts 

1 kg. (2.2 lbs.) 

6964048 

6956048 

48 VDC 

67.0 ohms 

0.7 amps 

33.6 watts 

1 kg. (2.2 lbs.) 


120 

110 

100 

90 

80 

70 

60 

50 





-40 -30 -20 -10 0 10 20 30 40 50 


60 70 


Series E 12-size coils are designed for use on 12-size spool 

valves only. These models are: SV12-24, SV12-25, SV12-3x, 

and SV12-4x. 

Series E 12-size coils cannot be used with the following 

12 and 16 size poppet valves: SV12-20, SV12-21, SV12-22, 

SV12-23, SV16-20, SV16-21, SV16-22, and SV16-23. These 

valves use the Series E 10-size coils. 

Series E coils cannot be used with PV, ZL or EHPR series 

valves. 

3.400.4



12-SIZE SERIES E COILS (For 12 Size Spool Valves Only) 

1.79 

45.6 

1.66 

42.2 

7.84 

199.1 

1.66 

42.2 

2.19 

55.6 

2.19 

55.6 

INCH 

MILLIMETRE 

2.19 

55.6 

Approx. 

Lead Length: 

16.34 

415 

3.03 

76.8 

3.03 

76.8 

3.03 

76.8 

ES 


Dual Spades SAE J858a 

EW 


Dual 18 Gauge Leads 

with Weather-Pack ® Connector 


EL 


Dual Leads – 18 Gauge 

ES Coil 

Part No. 

6851012 

EW Coil 

Part No. 

6853012 

EL Coil 

Part No. 

6852012 

Operating 

Voltage 

12 VDC 

Resistance 

at 20°C 

4.3 ohms 

Initial 

Current Draw 

2.8 amps 

Power 

33.6 watts 

Coil 

Weight 

1 kg. (2.2 lbs.) 

6851024 

6853024 

6852024 

24 VDC 

17.5 ohms 

1.4 amps 

33.6 watts 

1 kg. (2.2 lbs.) 

6851036 

6853036 

6852036 

36 VDC 

34.8 ohms 

1.0 amps 

36.0 watts 

1 kg. (2.2 lbs.) 

6851048 

6853048 

6852048 

48 VDC 

67.0 ohms 

0.7 amps 

33.6 watts 

1 kg. (2.2 lbs.) 


120 

110 

100 

90 

80 

70 

60 

50 





-40 -30 -20 -10 0 10 20 30 40 50 


60 70 


Series E 12-size coils are designed for use on 12-size spool 

valves only. These models are: SV12-24, SV12-25, SV12-3x, 

and SV12-4x. 

Series E 12-size coils cannot be used with the following 

12 and 16 size poppet valves: SV12-20, SV12-21, SV12-22, 

SV12-23, SV16-20, SV16-21, SV16-22, and SV16-23. These 

valves use the Series E 10-size coils. 

Series E coils cannot be used with PV, ZL or EHPR series 

valves. 

3.400.5

SERIES E COIL NUTS & SPACERS 

When ordering Series E coils for retrofit applications, the coil nut (top nut) must be ordered separately, based on 

the specific model of the valve to be retrofitted. Additionally, valves with dual coils (SV08-47 and SV10-47 models) 

require a spacer to be installed between the two coils. The spacer must also be ordered separately. 

® 



(For Valves with Manual Override, see page 3.400.7 for Coil Nut Information) 

1" HEX 1" HEX 1" HEX 1-1/4" 

HEX 

Coil Nut Part No. 

4502960 

For the following valves: 


4514800 



4503610 



7085180 

For the following 

12 size spool valves only: 

SL08-22 

SV08-20 

SV08-22 

SV08-24 

SV08-25 

SV08-26 

SV08-3x 

SV08-4x 

SV10-20 

SV10-22 

SV10-24 

SV10-25 

SV10-3x 

SV10-4x 

SV12-20 

SV12-22 

SV16-20 

SV16-22 

SV38-20 

SV38-22 

SV38-24 

SV38-25 

SV38-26 

SV38-3x 

SV38-4x 

SV58-20 

SV58-22 

SV58-24 

SV58-25 

SV58-26 

SV58-3x 

SV58-4x 

SV08-21 

SV08-23 

TS08-20 

TS98-3x 

TS80-30 

SV10-21 

SV10-23 

SV12-21 

SV12-23 

SV16-21 

SV16-23 

SV38-21 

SV38-23 

SV38-28 

SV38-38 

SV12-24 

SV12-25 

SV12-3x 

SV12-4x 

Spacers for Dual-Coil Valves: 

SV08-47 and SV10-47 

(to be installed between the two coils) 

1" HEX 1" HEX 

For SV08-47: 

Spacer Part No: 

4514810 

For SV10-47: 

Spacer Part No: 

4514130 

1.410 Dia. 1.836 Dia. 


4519810 


TS10-27 

TS12-27 

TS38-21 


4526330 


TS10-26 

TS12-26 

TS10-36 

TS38-20 

3.400.6



SERIES E COIL NUTS FOR VALVES WITH MANUAL OVERRIDE 

When ordering Series E coils for retrofit applications on valves with manual override, the coil nut (top nut) 

must be ordered separately, based on the specific model of the valve to be retrofitted. Additionally, valves 

with dual coils (SV08-47xM and SV10-47xM models) require a spacer to be installed between the two coils. 

The spacer must also be ordered separately. See page 3.400.6 for spacer information. 

1" HEX 1" HEX 1" HEX 


4526260 



4528150 



4527160 


SV08-20M 

SV08-22M 

SV08-24M 

SV08-25M 

SV08-26M 

SV08-3xM 

*SV08-4xM 

SV10-20M 

SV10-22M 

SV10-24M 

SV10-25M 

SV10-3xM 

*SV10-4xM 

SV12-20M 

SV12-22M 

SV16-20M 

SV16-22M 

SV38-20M 

SV38-22M 

SV38-24M 

SV38-25M 

SV38-26M 

SV38-3xM 

SV38-4xM 

SV58-20M 

SV58-22M 

SV58-24M 

SV58-25M 

SV58-26M 

SV58-3xM 

SV58-4xM 

SV08-47xM 

SV10-47xM 

*For SV08-47xM valves, use Coil Nut 4528150 

For SV10-47xM valves, use Coil Nut 4527160 

DESCRIPTION OF SERIES E COIL RATINGS 

IP69K: Coils with Metri-Pack ® connectors (EY option) 

Coils with Deutsch DT04-2P connectors (ER option) 

The coil is protected against intrusion of dust and high pressure 

water wash at 1450 psi (100 bar) with the source located 4 to 6 

inches (100 to 150 mm) from the coil. 

IP65: Coils with DIN 43650 connectors (EG option) 

Coils with Dual Spade connectors (ES option) 

Coils with Dual Lead Wires (EL option), and Coils with 

Leads and Weather-Pack ® Connector (EW option) 

The coil is protected against intrusion of dust and can withstand 

low-pressure water spray from a distance of 10 feet (3 meters). 

Thermal Shock Immersion Test: 

Coils with Metri-Pack ® connectors (EY option) 

Coils with Deutsch DT04-2P connectors (ER option) 

Known in the construction, agricultural and mobile equipment 

industries as a “thermal shock dunk test,” the coil is heated for 2 

hours at 105°C, then immediately immersed into 0°C water for 2 

hours. No water intrusion into the coil is allowed. This test is 

repeated for a total of five trials. The coil is then tested for 

operational standards. 

Metri-Pack ® and Weather-Pack ® are registered trademarks 

of Delphi Packard Electric Systems 

3.400.7

® 


Intro. to Electro-Hydraulic Control Technology 

ELECTRO-HYDRAULIC CONTROL 

Electronic Control 

Electronic control in mobile equipment can consist of the 

following: 

Inputs: Inputs can be defined as the user interface, and can 

consist of joysticks, potentiometers, an operator panel, or other 

input device. 

Controller or PLC: This is the brains of the electronic control. 

It processes the inputs and converts them into a defined output 

to the hydraulic system. The controller also can have the ability 

to receive feedback inputs from machine sensors and attenuate 

its outputs accordingly. The controller can be factoryprogrammed 

or have the ability to be user programmable to 

meet the specific needs of the application. 

Outputs: Outputs can be on/off voltage signals or proportional 

PWM signals to control the hydraulic valving. 

Communications: The controller can have the ability to 

engage in two-way communications with a bus system. 

Feedback Inputs: Can consist of pressure transducers, 

temperature sensors, flow sensors, velocity sensors or RPM 

sensors. When feedbacks are used the system is described as 

“closed loop.” 

Digital 

Digital signals vary in discrete steps or increments. A digital 

signal is normally in the form of a series of pulses that rapidly 

change from one distinct, fixed voltage level to another. 

A clock that displays the time in actual numerals that change in 

one-numeral increments is an example of a digital device. 

Accuracy in a digital device is generally higher than in an 

analog device. In digital systems, physical variables are 

represented by numerical values using the binary (base 2) 

number system. 

Electronic Control Platforms 

Some of the different forms that mobile electronics can take 

are described in the chart below. There is an increasing 

complexity and cost as the controllers move from singlefunction 

analog controls to complete complex digital control 

systems. 

Digital vehicle controllers offer a high level of sophistication by 

executing a programmed sequence of functions that constantly 

control all motion parameters. 

PLC—Programmable Logic Controller 

PLC’s were developed to replace the older “sequential relay 

circuits,” that were used for machine control. The PLC works 

by measuring its inputs and depending on their state, switching 

its outputs on or off. The user enters setup instructions, usually 

via software, that will produce the desired results. Because 

many of the controller’s functions are user programmable, a 

PLC has the versatility to be field-modified for changing 

applications or conditions. 

Some PLC’s have the capability to convert analog inputs, 

process them digitally, and produce analog outputs. PLC’s that 

do not have built-in converters require separate analog-todigital 

converters to convert the input. 

Analog 

An analog signal is an AC or DC voltage or current that varies 

smoothly and continuously. In an analog system, a physical 

variable is represented by a proportional voltage that varies in 

correspondence with the physical variable. Electronic circuits 

that process analog signals are called linear circuits. 

An example of an analog device is a traditional-style clock that 

has hour and minute sweep hands that rotate around the dial. 

It is very difficult to get a highly accurate time reading with this 

type of clock. The precision of the dial calibration is a limiting 

factor. 

Increasing Complexity and Value 

Electronic Control Technology Platforms 

for the Mobile Equipment Market 

Vehicle Control Systems 

Vehicle Control Subsystems 

Transmission Controller 

Digital Control Products 

Microprocessor 

PID Controller 

Motor Controller 

Closed Loop 

Flow Controller 

Fan Drive 

(with Sensor Input) 

On/Off 

Functions 

Digital Signal 

Processor (DSP) 

Pump Controller 

Analog Control Products 

Proportional 

Valve Controllers 

Soft Shift 

Soft Shift/Hold 

Low Cost Fan Drive 

Converter 

Controller 

with Position 

Feedback 

(Servo 

Mechanism) 

3.500.1


Proportional Valve Controller—DIN Coil Mount— 

GENERAL SPECIFICATIONS 

Plug Housing: Polyamide 

Plug Lid: Polycarbonate 

Weight: 30 g (1.06 oz.) without cable 

Connections: Mounted cable 

with unterminated wires provided; 

Length: approximately 2 meters (79") 

Note: The standard version of this 

controller is not UL Listed, but with 

the substitution of an alternate cable, 

it could be UL Listed. Consult factory. 

DESCRIPTION 0–5 VDC, 10K Pot or 0–20 mA Input 

A convenient, plug-mounted control amplifier for controlling HydraForce proportional 

valves that have solenoids with DIN 43650A/ISO 4400 electrical connectors. 

OPERATION 

This control module utilizes high frequency switching (PWM) to supply a proportional 

valve solenoid with a proportional control signal. The input signal to this controller can 

be from a 10K potentiometer, 0–5 VDC, 0–20 mA, or from other pre-set levels. 

FEATURES 

• Mounts directly to solenoid coils with DIN 43650A connectors. 

• IP65 weather resistant when used with base gasket (supplied). 

• Adjustments accessible with a removable cover. 

• One unit covers supply voltages from 9 to 32 VDC. 

• No internal fuses; circuit limits current electronically. 

• Short circuit proof and reverse polarity protected. 

• Connector can be disconnected from coil when powered. 

• Maximum current adjustment does not affect minimum current setting. 

• Independent ramp adjustments and internal supply for potentiometer. 

• Dither frequency and amplitude are adjustable for maximum valve performance. 

RATINGS 

Supply Voltage: 9–32 VDC (UL and cUL approval is for 9–28 VDC operation only) 

Coil rating must be matched with supply voltage: RCOIL ≤ (VSUPPLY – 1.5 V) / I-Max. 

Control Input Signal Options: 10K external potentiometer (accepts 5K to 50K pots), 

or 0–5 VDC signal, or 0–20 mA current signal (see connection diagrams) 

Input Resistance: Voltage Control: 125K Ohms; Current Control: 50K Ohms 

Output Current: up to 2000 mA (see ordering info.) 

Minimum Current Range: 0–500 mA (adjustable; see ordering info.) 

Maximum Current Range: 600–2000 mA (adjustable; see ordering info) 

Ramp Up and/or Down: 0.01–5.0 seconds (independently adjustable) 

Dither Frequency: 70–350 Hz (adjustable) 

Dither Amplitude: 0–10% of maximum current (adjustable) 

Operating Conditions: –20° to 85°C; 0 to 85% relative humidity 

Environmental Protection: IP65 with cover and base gasket installed 

SCHEMATIC 

V PS 

(9-32 VDC) 

+ 

– 

POWER 

GND 

ACTIVE 

REVERSE POLARITY 

PROTECTION 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

STEP-UP 

DC/DC 

CONVERTER 

+12 V 

–12 V 

POTENTIOMETER INPUT 

+5 V 

REFERENCE 

VOLTAGE IN 

(0-5 VDC) 

CURRENT IN 

(0-20 mA) 

SIGNAL GND 

VOLTAGE 

REFERENCE 

GENERATOR 

RAMP UP 

DITHER 

GENERATOR 

RAMP DOWN 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 

DITHER FREQUENCY 

R D 

R DITHER 

I-MAX. 

R MAX. 

DITHER 

AMPLITUDE 

I-MIN. 

+5 V 

+5 V 

R M 

R MIN. 

R DA 

ERROR 

AMPLIFIER 

+ 

– 

VOLTAGE 

TO 

HIGH FREQUENCY 

PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

S 1 

SOLENOID 

OUTPUT 

S 2 

3.510.1

® 


0–5 VDC, 10K Pot or 0–20 mA Input 

DIMENSIONS 

(+) Power Supply 

Red 

(–) Power Supply 

Black 

0–20 mA Input 

Blue 

Potentiometer Power White 

0–5 VDC Input 

Green 

Input Ground 

Brown 

ADJUSTMENTS DETAIL 

APPROX. 

79 

2 M 

3.36 

85 

Adjustments 

Under Cover. 

See Detail. 

1.34 

34 

Falling 

Ramp 

Dither 

Amplitude 

Rising 

Ramp 


Frequency 

1.50 

38 

Minimum 

Current 

Maximum 

Current 

INCH 

MILLIMETRE 

M3 

1.34 

34 

.22 

5.5 

CONNECTIONS 

For Complete Set-Up Instructions, see page 3.560.1 

For Either 0–20 mA or 0–5 VDC Control: 

Turn ramp screws fully counterclockwise to eliminate ramping. 

Use I-Min. screw to set minimum speed with minimum control input. 

Use I-Max. screw to set maximum speed with 100% of control input. 

10K Potentiometer (Pot.) Control 

0 to 20 mA Control 

0 to 5 VDC Control 

Supplied by User 

Wire Color 


Wire Color 


Wire Color 

(+) Power 

Red 

(+) Power 

Red 

(+) Power 

Red 

(–) Power 

Black 

(–) Power 

Black 

(–) Power 

Black 

Not Used 

Blue 

(+) 0–20mA 

Blue 

Not Used 

Blue 

(+) Pot. 

White 

Not Used 

White 

Not Used 

White 

10K Pot. 

Green 

Not Used 

Green 

(+) 0–5V 

Green 

(–) Pot. 

Brown 

(–) 0–20mA 

Brown 

(–) 0–5V 

Brown 

TO ORDER 

Part Number Output I-Min. Setting I-Max. Setting Cable Length 

7114950 2000 mA Max. 0 to 500 mA 600 to 2000 mA 2 meters 





3.510.2














DESCRIPTION 0–10 VDC Input 



OPERATION 



be from a 0–10 VDC source. 

FEATURES 







• Can be disconnected from coil when powered. 




RATINGS 



Control Input Signal: 0–10 VDC 

Input Resistance: 125K Ohms 



Maximum Current Range: 600–2000 mA (adjustable; see ordering info.) 






SCHEMATIC 

V PS + 

(9-32 VDC) 

– 

POWER 

GND 

ACTIVE 


PROTECTION 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

STEP-UP 

DC/DC 

CONVERTER 

+12 V 

–12 V 

NOT USED 

+5 V 

RAMP UP 

RAMP DOWN 

+5 V 

VOLTAGE IN 

(0-10 VDC) 

NOT USED 

SIGNAL GND 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 


R D 

R DITHER 

DITHER 

GENERATOR 

I-MAX. 

R MAX. 

DITHER 

AMPLITUDE 

I-MIN. 

R M 

R MIN. 

R DA 

ERROR 

AMPLIFIER 

+ 

– 

VOLTAGE 

TO 


PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

S 1 

SOLENOID 

OUTPUT 

S 2 

3.511.1

® 



DIMENSIONS 


Red 


Black 

Not Used 

Blue 

Not Used 

White 


Green 

Input Ground 

Brown 


APPROX. 

79 

2 M 

3.36 

85 

Adjustments 

Under Cover. 

See Detail. 

1.34 

34 

Falling 

Ramp 


Amplitude 

Rising 

Ramp 


Frequency 

1.50 

38 

Minimum 

Current 

Maximum 

Current 

INCH 

MILLIMETRE 

M3 

1.34 

34 

.22 

5.5 

CONNECTIONS 


Basic Setup: 






(+) Power 

(–) Power 

Not Used 

Not Used 

(+) 0–10V 

(–) 0–10V 

Wire Color 

Red 

Black 

Blue 

White 

Green 

Brown 

TO ORDER 







3.511.2














DESCRIPTION 4–20 mA Input 



OPERATION 


valve solenoid with a proportional control signal. This controller will accept a 4–20 mA 

input signal from a programmable logic controller (PLC) or other control systems. 

FEATURES 









• Independent ramp adjustments. 


RATINGS 



Control Input Signal Options: 4–20 mA current signal 

Input Resistance: 50 Ohms 









SCHEMATIC 

V PS + 

(9-32 VDC) 

– 

POWER 

GND 

ACTIVE 


PROTECTION 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

STEP-UP 

DC/DC 

CONVERTER 

+12 V 

–12 V 

+5 V 

RAMP UP 

RAMP DOWN 

+5 V 

CURRENT LOOP TRANSMITTER 

CURRENT IN 

(4-20 mA) 

SIGNAL GND 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 


R D 

R DITHER 

DITHER 

GENERATOR 

I-MAX. 

R MAX. 

DITHER 

AMPLITUDE 

I-MIN. 

R M 

R MIN. 

R DA 

ERROR 

AMPLIFIER 

+ 

– 

VOLTAGE 

TO 


PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

S 1 

SOLENOID 

OUTPUT 

S 2 

3.512.1

® 



DIMENSIONS 



(+) 4-20 mA Input 

Signal Ground 

Red 

Black 

White 

Green 

Adjustments 

Under Cover. 

See Detail. 

1.34 

34 


APPROX. 

79 

2 M 

3.36 

85 

Ramp 

Down 


Amplitude 

Ramp Up 


Frequency 

1.50 

38 

Minimum 

Current 

Maximum 

Current 

INCH 

MILLIMETRE 

M3 

1.34 

34 

.22 

5.5 

CONNECTIONS 


Basic Setup: 






(+) Power 

(–) Power 

(+) 4–20mA 

(–) 4–20mA 

Wire Color 

Red 

Black 

White 

Green 

TO ORDER 







3.512.2














DESCRIPTION 10K Pot or 0–5 VDC Input—Economy Version 



OPERATION 



be from a 10K potentiometer or a 0–5 VDC source. This economy version has no 

ramp adjustments. Dither frequency and amplitude are factory pre-set. 

FEATURES 









• Internal supply for potentiometer. 

RATINGS 

Supply Voltage: 9–32 VDC 



or 0–5 VDC current signal (see connection diagrams) 



Minimum Current Range: 0–500 mA (adjustable) 

Maximum Current Range: 600–2000 mA (adjustable) 

Internal Supply for Setpoint Potentiometer: +5VDC 

Dither Frequency: 200 Hz (±10% of full scale) Preset at Factory 

Dither Amplitude: 5% Preset at Factory 



SCHEMATIC 

V PS + 

(9-32 VDC) 

– 

POWER 

GND 

ACTIVE 


PROTECTION 


+5 V 

REFERENCE 

VOLTAGE IN 

(0-5 VDC) 

SIGNAL GND 

VOLTAGE 

REFERENCE 

GENERATOR 

DITHER 

GENERATOR 

R D 

LOW DROP OUT 

(LDO) VOLTAGE 

REGULATOR 

I-MIN. 

R M 

ERROR 

R IN R AMPLIFIER 

MIN. 

+ 

– 

I-MAX. 

R MAX. 

+5V 

VOLTAGE 

TO 


PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

S 1 

SOLENOID 

OUTPUT 

S 2 

3.513.1

10K Pot or 0–5 VDC Input—Economy Version 

DIMENSIONS 

® 



Red 


Black 

Potentiometer Power White 


Green 

Input Ground 

Brown 


APPROX. 

79 

2 M 

3.36 

85 

Adjustments 

Under Cover. 

See Detail. 

1.34 

34 

Minimum 

Current 

1.50 

38 

Maximum 

Current 

INCH 

MILLIMETRE 

M3 

1.34 

34 

.22 

5.5 

CONNECTIONS 




Wire Color 

(+) Power 

Red 

(–) Power 

Black 

(+) Pot. 

White 

10K Pot. 

Green 

(–) Pot. 

Brown 



(+) Power 

(–) Power 

Not Used 

(+) 0–5V 

(–) 0–5V 

Wire Color 

Red 

Black 

White 

Green 

Brown 

TO ORDER 


4000172 2000 mA 0 to 500 mA 600 to 2000 mA 2 meters 

3.513.2










DESCRIPTION Soft Shift—12 or 24 VDC Input 

A convenient, plug-mounted controller for HydraForce proportional valves that have 

solenoids with DIN 43650A/ISO 4400 electrical connectors. 

OPERATION 

This controller uses the power supply voltage as the control signal. It has an adjustable 

increasing ramp and an adjustable I-Max. setting. When power is applied to this 

controller, its output ramps up to maximum current in a time period that is adjustable 

within a factory set range. The ramp adjustment allows the user to define the length of 

time required for the hydraulic valve to reach its maximum output. When electrical 

power is removed, the output of this controller immediately falls to zero. 

FEATURES 






• Short circuit proof. 

RATINGS 



Output Current: 2 Amps Max. 

Ramp Adjustment: 0.01 to 5 seconds 

I-Max. Adjustment: 600–2000 mA 

Dither Frequency: 225 Hz ±10% (fixed) 

Dither Amplitude: 10% of rated maximum (fixed) 



SCHEMATIC 

24 V PS + 

(9-32 VDC) 

– 

TRANSIENT 

PROTECTION 

D 1 


PROTECTION 

7.5 V (LDO) 

LOW DROP OUT 

REGULATOR 

D 2 

I-MAX. 

WAVEFORM 

GENERATOR 

ERROR 

AMPLIFIER 

+ 

– 


PWM 

MODULATOR 

S 1 

RAMP 

TIME 

POWER 

UP 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

POWER 

OUTPUT 

STAGE 

SOLENOID 

OUTPUT 

S 2 

3.514.1

® 


Soft Shift—12 or 24 VDC Input 

DIMENSIONS 

(+) 12 or 24 VDC Power 

Red 

Adjustments 

Under Cover. 

See Detail. 

1.34 

34 

(–) 12 or 24 VDC Power 

Black 


APPROX. 

79 

2 M 

3.36 

85 

Rising 

Ramp 

1.50 

38 

Maximum 

Current 

INCH 

MILLIMETRE 

M3 

1.34 

34 

.22 

5.5 

Adjustments: 

Ramp: 0.01 to 5 seconds; Single Turn Potentiometer; CW to increase delay 

I-Max.: 600 to 2000 mA; Single Turn Potentiometer; CW to increase I-Max. 

TO ORDER 

Part Number I-Max. Setting Adjustable Ramp Time Cable Length 

4000072 600 to 2000 mA 0.01 to 5 seconds 2 meters 

3.514.2


Proportional Valve Controller—PCB Only— 


Weight: 25 g (0.88 oz.) 

Connections: Screw terminals 

for 16–30 AWG wire 

UL and cUL Listed: 

UL508 

CSA C22.2 No. 14-M91 


A printed circuit board-style (PCB) control amplifier for controlling HydraForce 

proportional valves. Remote mounting in a protected enclosure is required. 

OPERATION 




FEATURES 

• Adjustments and connections clearly labeled. 

• LED indication of output power level, input level and power on/off. 







• Filter eliminates electrical noise. 


RATINGS 





Input Resistance: Voltage: 250K Ohms; Current: 33 Ohms 







Dither Waveform: Triangular 


SCHEMATIC 


V PS + 

(9-32 VDC) 

– 

+5 V 

REFERENCE 

VOLTAGE IN 

(0-5 VDC) 

CURRENT IN 

(0-20 mA) 

SIGNAL GND 

POWER 

GND 

ACTIVE 


PROTECTION 

VOLTAGE 

REFERENCE 

GENERATOR 

RAMP UP 

DITHER 

GENERATOR 

RAMP DOWN 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 


R D 

R DITHER 

I-MAX. 

DITHER 

AMPLITUDE 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

R MAX. 

I-MIN. 

+5 V 

+5 V 

R M 

R MIN. 

R DA 

STEP-UP 

DC/DC 

CONVERTER 

ERROR 

AMPLIFIER 

+ 

– 

+12 V 

–12 V 

VOLTAGE 

TO 


PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

INPUT, OUTPUT 

AND 

POWER SUPPLY 

INDICATORS 

LOW 

PASS 

FILTER 

C F 

S 1 

SOLENOID 

OUTPUT 

S 2 

ENABLE 

3.520.1

® 



DIMENSIONS 

2.50 

63.5 

2.10 

53.3 

INCH 

MILLIMETRE 

2.50 

63.5 

2.10 

53.3 

Setscrew 

Adjustments 

Span 

I-Max. 

Zero 

I-Min. 


Frequency 

TP9 

R50 

R32 

TP1 

TP8 

TP7 

Input Level LED 

Brightness increases as 

input signal increases. 

TP10 

L3 

R46 

TP6 

Ramp Up 

(Rising Edge) 

R49 

R48 

Ramp Down 

(Falling Edge) 

Dither Level 

(Amplitude) 

R31 

TP5 

L2 

L1 

Power 

Okay LED 

TP3 

POW+ 

POW– 

TP4 

+5V REF 

V IN 

TP2 AGND 

I IN 

ENABLE 

FGND 

SOL– 

SOL+ 

Output Level LED 


output amperage increases. 

Screw Terminal Connections 


(+) Power 

(–) Power 

+5V Reference 

Voltage In 

Analog Ground 

Current In 

Enable 

Frame Ground 

(–) Solenoid 

(+) Solenoid 

Mounting Holes (4) 

0.156 (3.90) Dia. 

for #6 size screws 

(not supplied) 

Note: When Enable is 

connected to (+) Power 

or left open, the unit is 

enabled. When Enable 

is connected to (–) Power, 

the unit will be disabled. 

CONNECTIONS 


For Either 0–20 mA or 0–5 VDC Control: Turn ramp screws fully counterclockwise 

to eliminate ramping. Use I-Min. screw to set minimum speed with minimum control 

input. Use I-Max. screw to set maximum speed with 100% of control input. 





Screw Terminal 





(+) Power 

(+) Power 

(+) Power 

(+) Power 

(+) Power 

(+) Power 

(–) Power 

(–) Power 

(–) Power 

(–) Power 

(–) Power 

(–) Power 

(+) Pot. 

(+) 5V Reference 

Not Used 


Not Used 


10K Pot. 

Voltage In 

Not Used 

Voltage In 

(+) 0–5V 

Voltage In 

(–) Pot. 

Analog Gnd. 

(–) 0–20mA 

Analog Gnd. 

(–) 0–5V 

Analog Gnd. 

Not Used 

Current In 

(+) 0–20mA 

Current In 

Not Used 

Current In 

Enable 

Enable 

Enable 

Enable 

Enable 

Enable 

Frame Gnd. 

Frame Gnd. 

Frame Gnd. 

Frame Gnd. 

Frame Gnd. 

Frame Gnd. 

(–) Coil 


(–) Coil 


(–) Coil 


(+) Coil 

(+) Solenoid 

(+) Coil 

(+) Solenoid 

(+) Coil 

(+) Solenoid 

TO ORDER 

Part Number Output I-Min. Setting I-Max. Setting 

4000046 2000 mA Max. 0 to 500 mA 600 to 2000 mA 





3.520.2




Weight: 25 g (0.88 oz.) 




UL508 

CSA C22.2 No. 14-M91 




OPERATION 




FEATURES 











RATINGS 









Dither Frequency: 70–350 Hz (±10%) 




SCHEMATIC 

V PS + 

(9-32 VDC) 

– 

NOT USED 

POWER 

GND 

ACTIVE 


PROTECTION 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

+5 V 

STEP-UP 

DC/DC 

CONVERTER 

+12 V 

–12 V 

INPUT, OUTPUT 

AND 

POWER SUPPLY 

INDICATORS 

RAMP UP 

RAMP DOWN 

+5 V 

VOLTAGE IN 

(0-10 VDC) 

NOT USED 

ANALOG GND 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 


R D 

R DITHER 

DITHER 

GENERATOR 

I-MAX. 

R MAX. 

DITHER 

AMPLITUDE 

I-MIN. 

R M 

R MIN. 

R DA 

ERROR 

AMPLIFIER 

+ 

– 

VOLTAGE 

TO 


PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

LOW 

PASS 

FILTER 

C F 

S 1 

SOLENOID 

OUTPUT 

S 2 

ENABLE 

3.521.1

® 



DIMENSIONS 

2.50 

63.5 

2.10 

53.3 

INCH 

MILLIMETRE 

2.50 

63.5 

2.10 

53.3 

Setscrew 

Adjustments 

Span 

I-Max. 

Zero 

I-Min. 


Frequency 

TP9 

R50 

R32 

TP1 

TP8 

TP7 




TP10 

L3 

R46 

TP6 

Ramp Up 

(Rising Edge) 

R49 

R48 

Ramp Down 



(Amplitude) 

R31 

TP5 

L2 

L1 

Power 

Okay LED 

TP3 

POW+ 

POW– 

TP4 

+5V REF 

V IN 

TP2 AGND 

I IN 

ENABLE 

FGND 

SOL– 

SOL+ 






(+) Power 

(–) Power 

Not Used 

Voltage In 

Analog Ground 

Not Used 

Enable 

Frame Ground 


(+) Solenoid 


0.156 (3.90) Dia. 









CONNECTIONS 


Basic Setup: Controller is shipped with ramp trim pots fully counterclockwise to 

eliminate ramping. Use I-Min. screw to set minimum speed with minimum control 




(+) Power 

(–) Power 

Not Used 

(+) 0–10V 

(–) 0–10V 

Not Used 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 


(+) Power 

(–) Power 


Voltage In 

Analog Gnd. 

Current In 

Enable 

Frame Gnd. 


(+) Solenoid 

TO ORDER 



3.521.2




Weight: 25 g (0.88 oz.) 




UL508 

CSA C22.2 No. 14-M91 


A printed circuit board-style (PCB) control amplifier for HydraForce proportional 

valves. Remote mounting in a protected enclosure is required. This model is designed 

for circuits with long wire runs or where electrical interference is a problem. 

OPERATION 

This control module supplies a proportional valve solenoid with a proportional control 

signal. The input signal to this controller can be from a 4–20 mA source. 

FEATURES 








• Current sensing circuit maintains output current regardless of changes in input 

voltage or coil resistance. 

• Filter eliminates electrical noise; Independent ramp adjustments. 


RATINGS 



Control Input Signal: 4–20 mA current signal (see connection diagram) 

Input Resistance: 33 Ohms 









SCHEMATIC 

V PS + 

(9-32 VDC) 

– 

NOT USED 

POWER 

GND 

ACTIVE 


PROTECTION 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

+5 V 

STEP-UP 

DC/DC 

CONVERTER 

+12 V 

–12 V 

INPUT, OUTPUT 

AND 

POWER SUPPLY 

INDICATORS 

RAMP UP 

RAMP DOWN 

+5 V 


NOT USED 

CURRENT IN 

(4-20 mA) 

ANALOG GND 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 


R D 

R DITHER 

DITHER 

GENERATOR 

I-MAX. 

R MAX. 

DITHER 

AMPLITUDE 

I-MIN. 

R M 

R MIN. 

R DA 

ERROR 

AMPLIFIER 

+ 

– 

VOLTAGE 

TO 


PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

LOW 

PASS 

FILTER 

C F 

S 1 

SOLENOID 

OUTPUT 

S 2 

ENABLE 

3.522.1

® 



DIMENSIONS 

2.50 

63.5 

2.10 

53.3 

INCH 

MILLIMETRE 

2.50 

63.5 

2.10 

53.3 

Setscrew 

Adjustments 

Span 

I-Max. 

Zero 

I-Min. 


Frequency 

TP9 

R50 

R32 

TP1 

TP8 

TP7 




TP10 

L3 

R46 

TP6 

Ramp Up 

(Rising Edge) 

R49 

R48 

Ramp Down 



(Amplitude) 

R31 

TP5 

L2 

L1 

Power 

Okay LED 

TP3 

POW+ 

POW– 

TP4 

+5V REF 

V IN 

TP2 AGND 

I IN 

ENABLE 

FGND 

SOL– 

SOL+ 






(+) Power 

(–) Power 

Not Used 

Not Used 

Analog Ground 

Current In 

Enable 

Frame Ground 


(+) Solenoid 


0.156 (3.90) Dia. 









CONNECTIONS 


Basic Setup: Turn ramp screws fully counterclockwise to eliminate ramping. 





(+) Power 

(–) Power 

Not Used 

Not Used 

(–) 4–20mA 

(+) 4–20mA 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 


(+) Power 

(–) Power 


Voltage In 

Analog Gnd. 

Current In 

Enable 

Frame Gnd. 


(+) Solenoid 

TO ORDER 



3.522.2




Weight: 25 g (0.88 oz.) 



DESCRIPTION PWM (Pulse Train) Input 



OPERATION 


signal. The input signal to this controller can be from a PWM (pulse train) source. 

FEATURES 













RATINGS 



Control Input Signal: 250 to 5000 Hz PWM (pulse train); 5% to 95% duty cycle; 

Low < 1.5 volts; High > 3.5 volts; 50 volts maximum 










SCHEMATIC 

24 V PS + 

(9-32 VDC) 

– 

POWER 

GND 

ACTIVE 


PROTECTION 

CONTROL 

SECTION 

POWER SUPPLY 

& REFERENCE 

+10 V 

–10 V 

+5 V REF. 


R 1 R 2 

DITHER 

GENERATOR 

R8 

R9 

–7.5 V 

R7 

I-MIN. 

HIGH 

FREQUENCY 

PWM 

OUTPUT 

STAGE 

S 1 

SOLENOID 

OUTPUT 

S 2 

0–2.0 AMPS 

OUT 

RAMP 

UP 

RAMP 

DOWN 

R5 

ERROR 

AMPLIFIER 

+ 

– 

PWM INPUT 

PWM GND 

+ 

– 

INPUT SIGNAL 

NORMALIZATION 

AND PWM TO 

VOLTAGE 

CONVERSION 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 

I-MAX. 

R3 

R4 

R 6 R 10 

DITHER 

LEVEL 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

ENABLE 

3.525.1

® 


PWM (Pulse Train) Input 

DIMENSIONS 

2.50 

63.5 

2.10 

53.3 

INCH 

MILLIMETRE 

2.50 

63.5 

2.10 

53.3 

Setscrew 

Adjustments 

Span 

I-Max. 

Zero 

I-Min. 


Frequency 

TP9 

R50 

R32 

TP1 

TP8 

TP7 




TP10 

L3 

R46 

TP6 

Ramp Up 

(Rising Edge) 

R49 

R48 

Ramp Down 



(Amplitude) 

R31 

TP5 

L2 

L1 

Power 

Okay LED 

TP3 

POW+ 

POW– 

TP4 

+5V REF 

V IN 

TP2 AGND 

I IN 

ENABLE 

FGND 

SOL– 

SOL+ 






(+) Power 

(–) Power 

Not Used 

Not Used 

PWM Ground 

PWM In 

Enable 

Frame Ground 


(+) Solenoid 


0.156 (3.90) Dia. 









CONNECTIONS 





PWM (Pulse Train) Control 


(+) Power 

(–) Power 

Not Used 

Not Used 

Ground 

PWM Input 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 


(+) Power 

(–) Power 


Voltage In 

PWM Gnd. 

Current In 

Enable 

Frame Gnd. 


(+) Solenoid 

TO ORDER 



3.525.2


Proportional Valve Controller—Metal Housing— 


Metal Housing: Conformal coated; 

IP67 rated 

Weight: Metal Box without cable: 

400 g (14.1 oz.) 



Length: See ordering info. 


UL508 

CSA C22.2 No. 14-M91 

CE: EN 50081-2, EN50082-2 


A metal box-style control amplifier for controlling HydraForce proportional valves. 

The metal housing is IP67 rated. Remote mounting is required. 

OPERATION 




FEATURES 

• Adjustments accessible under removable cover. 










RATINGS 





Input Resistance: Voltage: 250K Ohms; Current: 33 Ohms 









SCHEMATIC 


V PS + 

(9-32 VDC) 

– 

+5 V 

REFERENCE 

VOLTAGE IN 

(0-5 VDC) 

CURRENT IN 

(0-20 mA) 

SIGNAL GND 

POWER 

GND 

ACTIVE 


PROTECTION 

VOLTAGE 

REFERENCE 

GENERATOR 

RAMP UP 

DITHER 

GENERATOR 

RAMP DOWN 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 


R D 

R DITHER 

I-MAX. 

DITHER 

AMPLITUDE 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

R MAX. 

I-MIN. 

+5 V 

+5 V 

R M 

R MIN. 

R DA 

STEP-UP 

DC/DC 

CONVERTER 

ERROR 

AMPLIFIER 

+ 

– 

+12 V 

–12 V 

VOLTAGE 

TO 


PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

INPUT, OUTPUT 

AND 

POWER SUPPLY 

INDICATORS 

LOW 

PASS 

FILTER 

C F 

S 1 

SOLENOID 

OUTPUT 

S 2 

ENABLE 

3.530.1

® 



DIMENSIONS 

For PCB (circuit board) only, 

refer to page 3.520.1 

4.50 

114.3 

4.00 

101.6 

(+) Power Supply Red 

(–) Power Supply Black 

5V Ref. 

Yellow/Red Stripe 

(+) 0–5V 

Yellow 

(–) V or mA Yellow/Black Stripe 

(+) 0–20 mA Yellow/Blue Stripe 

Enable 

Purple 

Frame Ground 

Shield 

(–) Coil 

Orange/Black Stripe 

(+) Coil 

Orange/Red Stripe 

Note: When Enable is connected 

to (+) Power or left open, the 

unit is enabled. When Enable 




0.250 (6.35) Dia. 

Cable Length 

See Ordering Info. 

INCH 

MILLIMETRE 

3.69 

93.7 

2.50 

63.5 

2.00 3.13 

50.8 79.4 

1.10 

27.9 

CONNECTIONS 



(+) Power 

(–) Power 

10K Pot. 

(+) Pot. 

(–) Pot. 

Not Used 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 


Wire Color 

Red 

Black 


Yellow 

Yellow/Black Stripe 

Yellow/Blue Stripe 

Purple 

Shield 



For Either 0–20 mA or 0–5 VDC Control: Turn ramp screws fully counterclockwise 

to eliminate ramping. Use I-Min. screw to set minimum speed with minimum control 




(+) Power 

(–) Power 

Not Used 

Not Used 

(–) 0–20mA 

(+) 0–20mA 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 

Wire Color 

Red 

Black 


Yellow 



Purple 

Shield 





(+) Power 

(–) Power 

Not Used 

(+) 0–5V 

(–) 0–5V 

Not Used 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 

Wire Color 

Red 

Black 


Yellow 



Purple 

Shield 



TO ORDER 

Part Number 

Part Number 

with 1.5 meter cable with 3 meter cable Output I-Min. Setting I-Max. Setting 

4000049 4000050 2000 mA Max. 0 to 500 mA 600 to 2000 mA 





3.530.2





IP67 rated 


400 g (14.1 oz.) 



Length: Approx. 1.5 meters (59") 


UL508 

CSA C22.2 No. 14-M91 

CE: EN 50081-2, EN50082-2 




OPERATION 




FEATURES 











RATINGS 













SCHEMATIC 

V PS + 

(9-32 VDC) 

– 

NOT USED 

POWER 

GND 

ACTIVE 


PROTECTION 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

+5 V 

STEP-UP 

DC/DC 

CONVERTER 

+12 V 

–12 V 

INPUT, OUTPUT 

AND 

POWER SUPPLY 

INDICATORS 

RAMP UP 

RAMP DOWN 

+5 V 

VOLTAGE IN 

(0-10 VDC) 

NOT USED 

ANALOG GND 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 


R D 

R DITHER 

DITHER 

GENERATOR 

I-MAX. 

R MAX. 

DITHER 

AMPLITUDE 

I-MIN. 

R M 

R MIN. 

R DA 

ERROR 

AMPLIFIER 

+ 

– 

VOLTAGE 

TO 


PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

LOW 

PASS 

FILTER 

C F 

S 1 

SOLENOID 

OUTPUT 

S 2 

ENABLE 

3.531.1

® 



DIMENSIONS 



4.50 

114.3 

4.00 

101.6 


Red 


Not Used 

(+) 0–10V 

(–) 0–10V 

Not Used 

Black 


Yellow 




0.250 (6.35) Dia. 

2.50 

63.5 

2.00 3.13 

50.8 79.4 

Enable 

Frame Ground 

(–) Coil 

(+) Coil 

Purple 

Shield 








Approx. 

59 

1.5 M 

INCH 

MILLIMETRE 

3.69 

93.7 

1.10 

27.9 

CONNECTIONS 


Basic Setup: Controller is shipped with ramp trim pots fully counterclockwise to 

eliminate ramping. Use I-Min. screw to set minimum speed with minimum control 




(+) Power 

(–) Power 

Not Used 

(+) 0–10V 

(–) 0–10V 

Not Used 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 

Wire Color 

Red 

Black 


Yellow 



Purple 

Shield 



TO ORDER 







3.531.2





IP67 rated 


400 g (14.1 oz.) 





UL508 

CSA C22.2 No. 14-M91 

CE: EN 50081-2, EN50082-2 



The metal housing is IP67 rated. Remote mounting is required. This model is 

designed for circuits with long wire runs or where electrical interference is a problem. 

OPERATION 


signal. The input signal to this controller can be from a 4–20 mA source. 

FEATURES 








• Current sensing circuit maintains output current regardless of changes in output 


• Filter eliminates electrical noise; Independent ramp adjustments. 


RATINGS 



Control Input Signal Options: 4–20 mA current signal (see connection diagram) 










SCHEMATIC 

V PS + 

(9-32 VDC) 

– 

NOT USED 

POWER 

GND 

ACTIVE 


PROTECTION 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

+5 V 

STEP-UP 

DC/DC 

CONVERTER 

+12 V 

–12 V 

INPUT, OUTPUT 

AND 

POWER SUPPLY 

INDICATORS 

RAMP UP 

RAMP DOWN 

+5 V 


NOT USED 

CURRENT IN 

(4-20 mA) 

ANALOG GND 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 


R D 

R DITHER 

DITHER 

GENERATOR 

I-MAX. 

R MAX. 

DITHER 

AMPLITUDE 

I-MIN. 

R M 

R MIN. 

R DA 

ERROR 

AMPLIFIER 

+ 

– 

VOLTAGE 

TO 


PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

LOW 

PASS 

FILTER 

C F 

S 1 

SOLENOID 

OUTPUT 

S 2 

ENABLE 

3.532.1

® 



DIMENSIONS 



4.50 

114.3 

4.00 

101.6 


Red 


Not Used 

Not Used 

(–) 4-20 mA 

(+) 4–20 mA 

Black 


Yellow 




0.250 (6.35) Dia. 

2.50 

63.5 

2.00 3.13 

50.8 79.4 

Enable 

Frame Ground 

(–) Coil 

(+) Coil 

Purple 

Shield 








Approx. 

59 

1.5 M 

INCH 

MILLIMETRE 

3.69 

93.7 

1.10 

27.9 

CONNECTIONS 







(+) Power 

(–) Power 

Not Used 

Not Used 

(–) 4–20mA 

(+) 4–20mA 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 

Wire Color 

Red 

Black 


Yellow 



Purple 

Shield 



TO ORDER 







3.532.2





IP67 rated 


400 g (14.1 oz.) 




CE Documented 

DESCRIPTION PWM (Pulse Train) Input 



OPERATION 


signal. The input signal to this controller can be from a PWM (pulse train) source. 

FEATURES 













RATINGS 



Control Input Signal: 250 to 5000 Hz PWM (pulse train); 5% to 95% duty cycle; 

Low < 1.5 volts; High > 3.5 volts; 50 volts maximum 










SCHEMATIC 

+ 

24 V PS 

(9-32 VDC) 

– 

POWER 

GND 

ACTIVE 


PROTECTION 

CONTROL 

SECTION 

POWER SUPPLY 

& REFERENCE 

+10 V 

–10 V 

+5 V REF. 


R 1 R 2 

DITHER 

GENERATOR 

R8 

R9 

–7.5 V 

R7 

I-MIN. 

HIGH 

FREQUENCY 

PWM 

OUTPUT 

STAGE 

S 1 

SOLENOID 

OUTPUT 

S 2 

0–2.0 AMPS 

OUT 

RAMP 

UP 

RAMP 

DOWN 

R5 

ERROR 

AMPLIFIER 

+ 

– 

PWM INPUT 

PWM GND 

+ 

– 

INPUT SIGNAL 

NORMALIZATION 

AND PWM TO 

VOLTAGE 

CONVERSION 

INDEPENDENT 

RAMP CONTROL 

FUNCTION 

I-MAX. 

R3 

R4 

R 6 R 10 

DITHER 

LEVEL 

CURRENT 

SENSING AND 

SHORT CIRCUIT 

PROTECTION 

ENABLE 

3.535.1

® 


PWM (Pulse Train) Input 

DIMENSIONS 



4.50 

114.3 

4.00 

101.6 


Red 


Not Used 

Not Used 

PWM Gnd. 

PWM In 

Black 


Yellow 




0.250 (6.35) Dia. 

2.50 

63.5 

2.00 3.13 

50.8 79.4 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 

Purple 

Shield 








Approx. 

59 

1.5 M 

INCH 

MILLIMETRE 

3.69 

93.7 

1.10 

27.9 

CONNECTIONS 





PWM (Pulse Train) Control 


(+) Power 

(–) Power 

Not Used 

Not Used 

PWM Gnd. 

PWM In 

Enable 

Frame Gnd. 

(–) Coil 

(+) Coil 

Wire Color 

Red 

Black 


Yellow 



Purple 

Shield 



TO ORDER 



3.535.2




Metal Housing: Conformal coated 

Exterior; Potted Interior; IP65 rated 

Weight: 0.58 kg (1.28 lbs.) 

Connections: Flat, tab-style (22); mates 

with 0.25 inch female tab connector: 

Keystone part no. 4470; also accepts 

16–20 AWG wire. 

DESCRIPTION Dual Solenoid Multifunction Valve Driver 


The metal housing is potted and is IP65 rated. Remote mounting is required. This 

controller has seven outputs that provide accurate control of hydraulic proportional 

and directional valves for a variety of hydraulic functions. 

OPERATION 

This controller will accept inputs from a joystick potentiometer with or without center 

tap, from a standard potentiometer, or from commonly available control signals such 

as 0–5 VDC, ±5 VDC, 0–10 VDC, 0–20 mA, and ±20 mA. It is designed for circuits 

using dual solenoid proportional four-way valves, single solenoid proportional flow 

and pressure controls, single or dual solenoid on/off valves, or half-speed functions. 

FEATURES 

• Adjustments easily accessible and clearly labeled. 

• High-efficiency PWM with superimposed dither. 



voltage and coil resistance. 

• High/Low range input provides reduced output for training or operation of equipment 

in tight spaces. 



• User selectable Deadband Jump. 

• Adjustable Min. and Max. current. 

• Pump Enable output active only when joystick is active. 

• Asymmetrical or symmetrical ramps—user selectable using Dip Switch 2 

• Center Null feature accommodates joystick or potentiometer centering errors. 

RATINGS 



Control Input Signal Options: User selectable using Dip Switch 1: 

Voltage Inputs: 0–5 VDC (2.5 VDC=0); 0–10 VDC (5 VDC=0); ±5 VDC (0 VDC=0); 

±10 VDC (0 VDC=0) 

Current Inputs: 0–20 mA (10 mA=0); ±20 mA (0 mA=0) 

Joystick Potentiometer Input: 10K potentiometer recommended; 5K to 50K pots 

can be used; The potentiometer connection provides a 5.0 VDC bias voltage 

as well as a 2.5 VDC center tap driving voltage. A remote joystick 

potentiometer with or without center tap can be used. 

Low Range Input (I-Max/2): Full speed unconnected; 50% speed activated by 

applying 9–32 VDC through an external switch. 

Input Resistance: Voltage Mode: 500K Ohms; Current Mode: 250 Ohms 


Minimum Current Range: 0–300 mA (adjustable) or 0–2000 mA (adjustable) 

depending on model selected (see ordering info.) 

Maximum Current Range: 0–300 mA (adjustable) or 0–2000 mA (adjustable) 

depending on model selected (see ordering info.) 

Ramp Up and/or Down: 0.01–5.0 seconds (independently adjustable 

using Dip Switch 2) 





3.540.1

Dual Solenoid Multifunction Valve Driver 

SCHEMATIC 

® 


V PS + 

(9-32 VDC) 

– 

REFERENCE 

+2.5 V 

+5 V 

+10 V 

VOLTAGE OR 

CURRENT IN 

DISABLE 

I-MAX/2 

POWER 

GND 

SIGNAL 

GND 

ACTIVE 


PROTECTION 

PROTECTED 

REFERENCE 

VOLTAGE GENERATOR 

PROTECTED 

INPUT RANGE 

SELECTION 

A 

UP 

DITHER 

LEVEL 

DITHER 

FREQUENCY 

A 

DOWN 

B B 

UP DOWN 

SYMMETRICAL OR 

NON-SYMMETRICAL 

RAMP GENERATOR 

DITHER 

GENERATOR 

DISABLE OR MASTER/SLAVE CONTROL 

I-MAX/2 (LOW RANGE INPUT) 

+5 V 

STEP-DOWN 

CONVERTER 

V PS TO 5.5 V 

Ap Ap Bp Bp 

I-MIN I-MAX I-MIN I-MAX 

SIGNAL PROCESSING 

DEADBAND AND 

CHANNEL SEPARATION 

STEP-UP 

DC/DC 

CONVERTER 

ERROR 

AMPLIFIER 

+ 

– 

+12 V 

–12 V 

VOLTAGE TO 

HIGH 

FREQUENCY 

PWM 

CONVERTER 

CURRENT 

SENSING AND 

SHORT 

CIRCUIT 

PROTECTION 

SHORT CIRCUIT 

PROTECTED 

DIGITAL 

OUTPUTS 

LOW 

PASS 

FILTER 

C F 

+ 

Ad – 

+ 

– 

Bd 

+ 

– 

ABd 

+ 

– 

Cd 

Bp 

Ap 

SOLENOID A 

SOLENOID B 

PROPORTIONAL OUTPUTS 

DIMENSIONS 

3.88 

98.4 

1.17 

29.7 

+ 

GND 

POWER 

9...32V 

SW1 SETTINGS 

SW2 SETTINGS 

5 SELECTS I or V INPUT SYM RAMPS 

1–ON ±10V 

SOL A: 1–ON 2–OFF 

2–ON ±5V or ±20mA 

SOL B: 3–ON 4–OFF 

NON-SYM RAMPS 

3–ON 0–10V 

SOL A: 1–OFF 2–ON 

4–ON 0–5V or 0–20mA SOL B: 3–OFF 4–ON 

5–ON=I OFF=V 

JOYSTICK DEADBAND 

5–ON=NO DEADBAND 

5–OFF=DEADBAND 

DUAL SOLENOID DRIVER 

P/N: 40XXXXX 

SAH 

SAL 

SBH 

SBL 

4.88 

123.8 

DITHER DITHER 

LEVEL FREQUENCY 

SGND 

IN 

DISABLE 

I-MIN-A I-MAX-A I-MIN-B I-MAX-B 

PROPORTIONAL 

OUTPUT 

Ad+ 

Ad– 

Bd+ 

4.28 

108.7 

5.38 

136.8 

I-MAX/2 

A-UP A-DOWN B-UP B-DOWN 

Bd– 

SGND 

ABd+ 

+10V REF 

ABd– 

+2.5V REF 

Cd+ 

+5V REF 

Cd– 

INPUT 

ON 

OFF 

ON 

1 2 3 4 5 

ON 

1 2 3 4 5 

ON 

OFF 

DIGITAL 

OUTPUT 

1 2 3 4 5 1 2 3 4 5 

SWITCH 1 SWITCH 2 

2.75 

69.9 


0.25 (6.35) Dia. 

0.80 

20.3 

0.05 

1.3 

INCH 

MILLIMETRE 

3.540.2



CONNECTIONS/ADJUSTMENTS 



Adjustments 

CW to Increase 

DITHER 

LEVEL 

0–10% 

or rated 

I-Max. 

DITHER 

FREQUENCY 

70–350 Hz 

Power Input 

+9–32 VDC 

Ground 

Control Inputs 

+ 

GND 

POWER 

9...32V 

SW1 SETTINGS 

SW2 SETTINGS 

5 SELECTS I or V INPUT SYM RAMPS 

1–ON ±10V 

SOL A: 1–ON 2–OFF 

2–ON ±5V or ±20mA 

SOL B: 3–ON 4–OFF 

NON-SYM RAMPS 

3–ON 0–10V 

SOL A: 1–OFF 2–ON 

4–ON 0–5V or 0–20mA SOL B: 3–OFF 4–ON 

5–ON=I OFF=V 


5–ON=NO DEADBAND 

5–OFF=DEADBAND 

DITHER 

LEVEL 

DITHER 

FREQUENCY 

DUAL SOLENOID DRIVER 

P/N: 40XXXXX 

SAH 

SAL 

SBH 

SBL 

PROPORTIONAL 

OUTPUT 

Proportional 

Outputs 

Solenoid Ap (High) 

Solenoid Ap (Low) 

Solenoid Bp (High) 

Solenoid Bp (Low) 

Digital Outputs 

Signal 

In 

SGND 

IN 

Ad+ 

Ad– 

Ad+ 

Ad– 

Disable 

I-Max/2 

Signal 

+10V Ref. 

+2.5V Ref. 

DISABLE 


I-MAX/2 A-UP A-DOWN B-UP B-DOWN 

SGND 

+10V REF 

+2.5V REF 

Bd+ 

Bd– 

ABd+ 

ABd– 

Cd+ 

Bd+ 

Bd– 

ABd+ Pump Enable 

ABd– Pump Enable 

Cd+ Latching 

+5V Ref. 

INPUT 

+5V REF 

ON 

OFF 

ON 

1 2 3 4 5 

ON 

1 2 3 4 5 

ON 

OFF 

DIGITAL 

OUTPUT 

Cd– 

Cd– Latching 

1 2 3 4 5 1 2 3 4 5 


INPUT SELECTION OPTIONS 

Current=ON 

Voltage=OFF 

0–5VDC or 0–20mA 

0–10VDC 

±5VDC or ±0–20mA 

±10VDC 

Settings 

shown are for 

0–10VDC input 

ON 

OFF 

ON 

1 2 3 4 5 

ON 

1 2 3 4 5 

1 2 3 4 5 1 2 3 4 5 


SOLENOID 'A' RAMPS 

Symmetrical: 1=ON, 2=OFF 

Non-Symmetrical: 1=OFF, 2=ON 

SOLENOID 'B' RAMPS 

Symmetrical: 3=ON, 4=OFF 

Non-Symmetrical: 3=OFF, 4=ON 


No Joystick Deadband: 5=ON 

Joystick Deadband: 5=OFF 

ON 

OFF 

Settings shown are for 

Symmetrical Up and 

Down Ramps for 

Solenoids 'A' and 'B'. 

Electronic Deadband 

is selected for Joystick 

Input or Control Signal. 

Proportional Adjustments 

0–2.0 amps or 0–300 mA 



Ramp Time Adjustments 

0.01 to 5 seconds 


A-UP A-DOWN B-UP 

B-DOWN 

3.540.3


APPLICATION INTERFACE INFORMATION 

® 


Input Specifications: 

For proper operation, match the power supply voltage with the 

rating of the coil. Operating this driver with a supply voltage 

lower than the coil’s rated voltage may result in reduced 

maximum current output. 

Output Specifications: 

All outputs are capable of operating a 2 amp solenoid or relay. 

Each output can withstand an indefinite short cicuit to power or 

ground. Each output is protected from “over voltage” with a 

recirculating diode. For proper operation of this driver, the 

solenoid coils should have no polarity or protection diodes. 

The maximum current output of this driver should not exceed 

the current rating of the coil. 

Joystick Deadband: 

Deadband is the zone of the joystick or threshold of the control 

signal where no action is generated by movement of the 

joystick or application of the control signal. “Deadband Jump” 

will be provided by safety microswitches if they are installed on 

the joystick. This feature can be enabled or disabled using 

Dip Switch 2. 

Joystick Center Null: 

If the joystick does not have safety microswitches installed, 

this effect can be achieved by external connections to the input 

side of this driver. Connect the joystick potentiometer to the 

+5V Reference and connect the midpoint terminal to the 

+2.5V Reference. This ensures that the mechanical and 

electrical centers of the joystick are consistent with each other. 

CONTROL SIGNAL INTERFACE 

CENTER TAP JOYSTICK INTERFACE 

POWER 

9...32V 

POWER 

9...32V 

VEHICLE 

POWER 

SUPPLY 

Safety Enable 

Supplied by Customer 

+ 

GND 

VEHICLE 

POWER 

SUPPLY 

Safety Enable 


+ 

GND 

SGND 

SGND 

CONTROL 

SIGNAL 

External Switch 

Supplied 

by Customer 

IN 

DISABLE 

I-MAX/2 

External Switch 


IN 

DISABLE 

I-MAX/2 

SGND 

SGND 

Control Signal Input Options: 

0 to 5V, 0 to ±5V 

0 to 10V, 0 to ±10V 

0 to 20mA, 0 to ±20mA 

Select Current or Voltage Input 

and Value on Dip Switch 1 

INPUT 

+10V REF 

+2.5V REF 

+5V REF 

10K 

Center Tap Joystick 

Select Current or Voltage Input 

and Value on Dip Switch 1 

(0–5 VDC example shown) 

INPUT 

+10V REF 

+2.5V REF 

+5V REF 

3.540.4



TYPICAL APPLICATIONS 


Application A 

Application E 

Directional 2-Position 

4-Way Control Valve 

Dual Solenoid 4-Port Proportional Valve 

Ap 

Bp 

Dual Solenoid 

Multifunction 

Valve Driver 

Ad 

Dual Solenoid 

Multifunction 

Valve Driver 

ABp 

Application B 

Directional 3-Position 4-Way Control Valve 

Single Solenoid 2-Port 

Proportional Flow Control Valve 

Ad 

Bd 

Dual Solenoid 

Multifunction 

Valve Driver 

ABp 

Application C 


Single Solenoid 2-Port Proportional Valve 

Application H 



Ad 

Bd 

Dual Solenoid 

Multifunction 

Valve Driver 

ABp 

Cd 

Dual Solenoid 

Multifunction 

Valve Driver 

Bypass Proportional 

Flow Control Valve 

Application F2 

Application F1 





Ad 

Bd 

Dual 

Solenoid 

Multifunction 

Valve Driver 



Ad 

Bd 

Dual Solenoid 

Multifunction 

Valve Driver 

ABp 

ABp 





3.540.7


TYPICAL APPLICATIONS 

® 


Application D 


Application G 



Ad 

Bd 

Dual Solenoid 

Multifunction 

Valve Driver 

ABp ABd 



Ad 

Bd 

Dual 

Solenoid 

Multifunction 

Valve Driver 

ABp 



Relief 

Valve 

Pump Enable 

Valve 

Relief 

Valve 

Pump 

Variable 

Displacement 

Pump 

Single Solenoid 

2-Port Proportional 

Flow Control Valve 

Application I 

Application J 

EHPR 

Electro-Proportional 

Reducing/Relieving 

Valve 

PExx Proportional 

Pilot-Operated, 3-Position, 

4-Way, Spring-Centered 

Directional Valve 

EHPR Electro-Proportional 

Reducing/Relieving Valve 

SPxx-47 Direct-Acting, 

Proportional, 3-Position, 

4-Way, Spring-Centered 

Directional Valve 

Bp 

Ap 

Dual Solenoid 

Multifunction 

Valve Driver 

Relief 

Valve 

Ap 

Bp 

Dual Solenoid 

Multifunction 

Valve Driver 

Relief 

Valve 

3.540.8



JOYSTICK MOTION 


Typical Joystick Motion Correlated to Output Signal 

Single Axis with Seven Outputs and ±7.5° Electronic Deadband Illustrated (other values are available) 

45° 7.5° 0° 7.5° 45° 

2 Amp 

0 Amp 

Ap 

Solenoid A 

Proportional Output 

2 Amp 

0 Amp 

Bp 

Solenoid B 


2 Amp 

0 Amp 

ABp (See Note Below) 

Solenoids A & B 


2 Amp 

0 Amp 

Ad 

Solenoid A 

Digital Output On/Off 

2 Amp 

0 Amp 

Bd 

Solenoid B 


2 Amp 

0 Amp 

ABd (Pump Enable; Ad or Bd ON) 

Solenoids A & B 


2 Amp 

0 Amp 

Cd 

Latching 


45° 

45° 

Note: The ABp signal can be 

used to drive a single solenoid: 

Externally short the SAL and 

SBL terminals, and connect the 

solenoid to SBL and either SAH 

or SBH. 

3.540.5


® 


JOYSTICK MOTION 

Typical Joystick Outputs: 

The Dual Solenoid Driver has multiple outputs available to 

support a variety of hydraulic circuits. The diagram on the 

previous page shows the outputs of the Driver as they relate to 

the movement of a remote joystick, with the Deadband function 

selected (dipswitch setting on Driver). 

The joystick has its own potentiometer which senses movement 

and signals the Driver to automatically activate its 

additional outputs. The potentiometer output will signal the 

Driver, causing the Ad, Bd and Abd signals to be generated 

electronically. 

The Dual Solenoid Driver can be used to replace joystick 

outputs that might otherwise be generated by microswitches or 

trigger switches. Problems normally encountered with mechanical 

switches can be eliminated because the Driver 

produces its outputs electronically. 

Some typical mechanical push-button and joystick-actuated 

microswitches are illustrated below. 

Signal Gnd. 

Ad 

2.5V Ref. 

+5V 

Bd 

Signal 

Common 

Push Button 

Microswitch Actuated by Joystick Movement 

Abd 

Common 

TO ORDER 

Part Number Control Input I-Min. Setting I-Max. Setting 

4000149 0–5 VDC, 10 VDC 0 to 2000 mA 0 to 2000 mA 

4000150 0–5 VDC 0 to 300 mA 0 to 300 mA 

4000151 4–20 mA 0 to 2000 mA 0 to 2000 mA 

3.540.6


Proportional Valve Controllers—Set-up Instructions 

SETUP INSTRUCTIONS 

Preparation 

Make sure that the controller/amplifier is connected to an 

operating proportional valve. 

For the coil mount version, use a small screwdriver to loosen 

the mounting screw and remove the transparent cover. 

Use a jeweler’s size screwdriver (slotted 1.5) to make adjustments 

to the trim pots. 

For the metal box style, use a screwdriver to remove the metal 

cover. Use a small screwdriver to make adjustments to the trim 

pots. 

Interaction Between Maximum Current (I-Max.) 

and Minimum Current (I–Min.) Adjustments 

• Adjusting the maximum current (I-Max.) does not affect the 

minimum current (I-Min.) setting. 

• Adjusting the minimum current (I-Min.) will shift the maximum 

current (I-Max.) setting. 

Solenoid Current (amps) 

2 

1 

Factory Setting: I-Max. = 100%; I-Min. = 0% 

Adjustment to I-Max. = 50%; I-Min. remains at 0% 

Input 

Voltage/Current 

Solenoid Current (amps) 

Offset = I-Min 

Slope = I-Max 

100% Input 

Voltage/Current 

Setting the Minimum Current (I–Min.) 

The minimum setting can be used to take into account the 

mechanical valve deadband and provide desired offsets from 

zero to allow full control within the functional range of the 

specific valve. 

1. Set the minimum current before setting the maximum 

current. 

2. Apply appropriate minimum input (4mA, 0V or 

potentiometer, 0V or 0A). 

3. The factory setting for the I-Min. trim pot is zero, 

fully counterclockwise (CCW). 

4. If the desired minimum current is greater than zero, 

adjust the trim pot clockwise (CW) until the desired 

current is achieved. 

Setting the Maximum Current (I–Max.) 

1. Apply appropriate maximum control (20mA, 5V or control 

pot at maximum, 10V) 

2. Factory setting for the I-Max. trim pot is 100% or fully 

clockwise (CW). 

3. Turn the trim pot counterclockwise (CCW) to adjust the 

current downwards to the desired maximum. 

The maximum current setting is adjusted to match the 

customer’s working pressure or flow range to the full scale 

signal input range. This provides maximum control for a 

specific application. 

Setting the Ramp Times 

1. The factory setting for ramp times is the minimum (0.01 

seconds) or fully CCW. 

2. If the ramp time settings are not needed, leave the 

settings at the minimum value. (The “Economy” version 

controller has no ramps.) 

3. To change the ramp times, adjust the trim pot CW to 

increase the time. 

4. Rising (ramp up) and falling (ramp down) times are 

independent. 

Ramp times are application dependent. They limit the rate of 

change or how fast the operation happens. 

Note: If the input signal is not applied long enough for the 

ramp time that has been set, the desired solenoid current will 

not be reached. 

Input 

Signal 

Solenoid 

Current On 

Rise 

Time 

Solenoid 

Current Off 

Fall 

Time 

Setting the Dither Amplitude 

1. The factory setting for dither amplitude is 0% (CCW). 

2. To adjust dither amplitude, turn the trim pot clockwise until 

small changes in the input signal register similar changes 

in current output. 

3. Choose the smallest effective dither amplitude. 

(The “Economy” version controller has no dither 

amplitude adjustment.) 

Dither amplitude is adjustable from 0 to 10% of rated maximum 

current. Dither amplitude and frequency are dependent on the 

specific valve. The effects of static friction on the operation of 

the solenoid are reduced by the application of a small AC 

current. The hysteresis and repeatability of the valve are 

improved by this practice. The optimum dither amplitude is 

attained when small input signal changes register similar 

changes in current output (pressure or flow through the valve). 

Setting the Dither Frequency 

1. The factory setting for dither frequency is the minimum 

or 0% (CCW). 

2. To adjust dither frequency, turn the trim pot clockwise until 

the desired frequency is set. 

3. For the dither rating of a particular valve, refer to the 

HydraForce catalog. 

Start Up Procedures 

1. Make sure that all components, such as the cover, 

compression washer, O-ring and base gasket, are correctly 

in place (necessary for IP65 protection). 

2. Attach the proportional valve amplifier to the load. 

3. Switch on the power supply to the controller/amplifier and 

apply a control signal. 

3.560.1

Proportional Valve Controllers—Glossary 

ELECTRONIC TERMS & DEFINITIONS 

1. Ohms Law: Current = Voltage ÷ Resistance (I = E ÷ R) 

2. Current: The flow of electrons in a conductor. It is normally measured in 

amperes (A) or milli-amperes (mA). Calculations and electrical diagrams 

sometimes use the abbreviation “I” to symbolize current. 

3. Voltage: The potential for current flow in an electrical circuit. It is measured in 

volts, and is sometimes abbreviated (V or E). Generally, higher voltage will 

induce higher current. 

4. Resistance: Anything that causes an opposition to the flow of electrical current. 

It is used to control the amount of voltage and/or amperage in a circuit. 

Everything in a circuit, including wire, causes some resistance. Resistance is 

measured in units called Ohms and is sometimes abbreviated “R” or “Ω” 

(Greek letter omega). 

5. Hysteresis: The measurement of the difference in output when current in a 

device is increasing vs. when current is decreasing. It is normally expressed 

as a percentage of the total change in input. 

6. Proportional Controller/Amplifier: A device that converts a low-power input 

signal into an output signal that is capable of operating the valve. This output 

signal can be modified to include PWM, ramping, or dither. 

7. PWM (Pulse Width Modulation): An efficient technique to control current. 

A PWM-switched signal pulses on and off to achieve the current flow 

required. PWM frequency can be low (100 to 400 Hz) or high (over 5000 Hz). 

High frequency produces a more constant ripple-free amperage output. 

8. Ramping: The ability to control the rate of change of the output of an amplifier 

or controller. 

9. Dither (Current Ripple): A rapid, small movement of the valve spool around 

the desired position. Dither keeps the spool moving to avoid “stiction” and to 

help average-out hysteresis. 

10. I-Min. and I-Max.: The minimum and maximum control current induced into a 

proportional valve coil. 

11. No Load Power: The power consumed by the amplifier or proportional 

controller when there is no output to the valve coil. 

12. Maximum Control Current: The point where increasing current input no 

longer results in an increase in valve flow. 

13. Threshold Current: The amount of current required to reach the point where 

increasing current input causes flow from the valve to begin to increase 

(normally closed valve) or decrease (normally open valve). 

14. Compensator: A hydraulic device that maintains a fixed pressure drop across 

a fixed or variable orifice by restricting or bypassing flow. 

® 


3.560.2


Electronics in the Mobile Equipment Industries 

ELECTRONIC CONTROL OF HYDRAULIC SYSTEMS 

As mobile equipment becomes more technologically 

sophisticated, the need for electronic control of hydraulic 

systems is growing. 

Electronic components have become more reliable and 

rugged; they can now withstand the harsh environmental 

conditions required for mobile equipment applications. 

Sophisticated electronic controllers normally supply only low 

power control signals. Amplification of the control signal is 

usually required to actuate solenoid-operated hydraulic valves. 

Electronic controllers that are designed for hydraulic applications 

will normally include the required amplification functions. 

How PWM Works 

A PWM signal is not constant, it is on for a period of time and 

off for a period of time (see Fig. 1). 

Voltage 

D 

50% 

On 

25% 

On 

75% 

On 

Why Pulse Width Modulation (PWM) 

When voltage is applied to a valve coil, the current flowing 

through it creates a magnetic field which provides the force to 

shift the valve’s spool or poppet. The input voltage divided by 

the resistance of the coil equals the current draw. This is very 

straightforward when used with on/off valves, but proportional 

valves are only useful if the spool position can be precisely 

controlled by varying the input current. 

A simple potentiometer can be used to vary the resistance, 

which then varies the input current. This is an inefficient 

method of control, and is not practical when high currents are 

required. Also, when an infinitely variable DC signal is used to 

operate a proportional valve solenoid, the output transistor of 

the amplifier functions like a variable resistor. It drops the 

power supply voltage down to the level required by the 

solenoid coil at a particular time. The full coil current, which 

may be several amps, needs to pass through this output 

transistor. The result is that the transistor builds up heat which 

requires a large heat sink to dissipate. 

Pulse Width Modulation (PWM) is a control technique which 

can overcome the problems described above. With PWM, the 

output transistor is used as an on/off switch, feeding the 

solenoid coil with a series of on/off pulses at a constant 

voltage. The pulses are set at a constant frequency, typically 

400 to 5000+ Hz. The signal level is determined by varying the 

duration of the “on” pulses relative to the “off” pulses. 

The advantage of this technique is that during the “off” pulse, 

the output transistor is not passing any current, and during the 

“on” pulse, there is virtually no voltage drop across the 

transistor and therefore very little heat is created. In practice, 

there will be a small voltage drop across the transistor during 

the “on” pulses, and it takes a finite amount of time to switch on 

and off, so a small amount of heat is created. However, the 

amount of heat is much smaller than would be produced by a 

conventional DC output signal. 

PWM has become the standard for all valve amplifiers in order 

to reduce amplifier size and power waste. No modifications are 

required to the valve solenoid in order to use this technique. 

PWM is an efficient way to control current to a proportional 

valve coil. It allows the use of electronics for current regulation, 

dither, ramping, short circuit protection, and the elimination of 

deadband. 

1 Hz 

1 Hz 

1 Hz = 1 Cycle per Second 

Fig. 1 

1 Hz 

The duty cycle “D” refers to the “on” portion of the cycle. The 

duty cycle can be anywhere from 0 (signal always off) to 1 

(signal always on). A 50% “D” results in a perfect square wave. 

The PWM signal frequency can be low (100 to 400 Hz) or high 

(over 5000 Hz). High frequency PWM is more desirable 

because it produces a more constant ripple-free amperage 

output. 

Coil Inductance 

Inductance is the characteristic of a circuit that opposes the 

starting, stopping or changing of current flow. Inductance in an 

electrical system is similar to inertia in a mechanical system. Its 

effect is to introduce a time lag into the duty cycle wave form. 

In theory the wave form is perfectly rectangular, rising immediately 

when current is applied, and falling immediately when 

current is withdrawn. Because of the effects of inductance, the 

actual wave form rises and falls more gradually (see Fig. 2). 

Voltage 

D 

50% 

Amps 

1 Hz 

Fig. 2 


3.561.1

® 


ELECTRONIC CONTROL OF HYDRAULIC SYSTEMS (cont’d) 

PWM Current Characteristics 

At 25% signal, “D” is shorter than the time it takes the current 

to reach its maximum value (see Fig. 3). This results in 

reduced current output to the valve coil, and therefore a 

reduced hydraulic output from the valve. If the PWM frequency 

is low enough, the current will fall to zero during the off time. 

This is described as “discontinuous current.” 

Voltage 

Amps 

D 25% 

1 Hz 

Dither (Current Ripple) 

Fig. 3 


Stiction and hysteresis can make the behavior of a hydraulic 

proportional valve seem erratic and unpredictable. 

Stiction keeps the valve spool from moving when input signal 

changes are small. When the signal finally becomes large 

enough to initiate movement, the spool will tend to overshoot 

the position required for accurate control. 

Hysteresis is the tendency for the spool shift to be different 

depending on whether the change is increasing or decreasing, 

even when the control signal input value is identical. 

Dither is a rapid, small movement of the spool around the 

desired position. It is intended to keep the spool moving to 

avoid stiction and average-out hysteresis. Dither amplitude 

must be large enough and the frequency slow enough for the 

spool to respond, and yet small and fast enough to avoid 

creating a noticeable pulsation in the hydraulic output of the 

valve. 

Dither is caused by coil current “ripples”—current variations 

around the desired control signal value. Due to inertia, the 

valve spool will follow low frequency ripples better than it will 

follow high frequency ripples. The amplitude of the ripples 

determines if, or how far, the spool will move at a given 

frequency. 

Low Frequency PWM 

Low Frequency PWM, typically less than 400 Hz, generates 

dither (current ripple) as a by-product of the PWM process (see 

Fig. 4). The PWM frequency is low enough so that the current 

has time to decay before the next rise begins. The amount of 

dither (ripple) changes as the average coil current changes. 

Dither is maximum at 50% “D.” Dither decreases to zero at 0% 

and 100% “D.” This can result in too much dither at some 

current levels and not enough at others. 

The dither current amplitude at a given average current is a 

function of coil inductance and PWM frequency. The inductance 

of a coil is largely a function of its rated voltage and 

wattage. A low wattage coil will usually have more inductance—thus 

less by-product dither for a given PWM frequency—than 

a high wattage coil. 

Different valve designs will have differing responses to the 

same dither frequency and amplitude. Changing the PWM 

frequency will allow adjusting the dither, but the amplitude and 

frequency of the dither cannot be set independently as may be 

required by various valve designs. 

High Frequency PWM 

200 to 300 Hz 

Fig. 4 

Inherent Ripple 

When the PWM frequency is high enough, typically above 

5000 Hz, the coil current will be constant for all practical 

purposes (see Fig. 5). No by-product dither will be produced by 

high frequency PWM. 

Over 5000 Hz 

Fig. 5 

3.561.2


Electronics in the Mobile Equipment Industries 

ELECTRONIC CONTROL OF HYDRAULIC SYSTEMS (cont’d) 

The advantage of using high frequency PWM is that dither can 

be generated separately and then superimposed on top of the 

output current (see Fig. 6). This allows the user to independently 

control the current level, as well as the dither frequency 

and amplitude. The dither will therefore be constant for any 

current level, and its frequency and amplitude can be set by 

the user to optimize the function of the particular hydraulic 

valve. 

Independent ramps (see Fig. 8) have separate potentiometers 

for the increasing and decreasing sides, allowing acceleration 

and deceleration to be set independently of one another. 

+ 

Input 

Signal 

Independent Ramps 

Ramp 

Ramp 

Frequency 

70–350 Hz 

0 

Time 

Fig. 8 

Amplitude 

10% of 

2 Amps Max. 

Dual-coil bi-directional valve drivers offer two independent 

ramps per coil, for a total of four independently controlled 

ramps (see Fig. 9). 

Ramps 

Superimposed Dither 

Fig. 6 

Ramps are used to slow down the response of the valve driver 

to a changing command input. This results in a smooth 

transition when an abrupt change of the command input signal 

occurs. Ramps have no effect if the input signal change is 

slower than the ramp setting. 

Ramps can be fixed or adjustable, symmetrical or independent, 

and single or dual. Adjustable ramps usually operate in the 

zero to eight second range and are controlled by a potentiometer. 

Single-side ramps are usually used in slow-shift controls 

where only acceleration is a concern. 

Symmetrical ramps (see Fig. 7) are controlled by a single 

potentiometer that adjusts the increasing and decreasing 

ramps identically. 

Dual Solenoid Driver with Independent Ramps 

+ 

Input 

Signal 

0 

Input 

Signal 

– 

Ramp 

Ramp 

Time 

Fig. 9 

Gain or I-Max. 

The gain of an amplifier is the ratio of its large output signal (to 

the valve) to its small control input signal. 

Gain = Output Signal ÷ Input Signal 

The gain is usually adjusted by a potentiometer on the amplifier. 

This adjustment is usually called “I-Max.” Adjusting the 

I-Max. adjusts the amplifier gain. This can be used to adjust 

the maximum output of the amplifier (which controls the valve 

setting) for full input signal. 

Ramp 

Ramp 

+ 

Input 

Signal 

0 

Symmetrical Ramps 

Ramp 

Time 

Fig. 7 

Ramp 

Enable/Disable 

Some control/amplifiers incorporate an “Enable” function. This 

is a safety feature that requires a specific voltage to be present 

at the enable connection before the output of the controller will 

operate. Enable can be used for an emergency stop switch or 

other safety interlock device. 

While it is possible to place an emergency stop switch in the 

power supply, this is not recommended because stored 

charges in capacitors can maintain the valve signal for a period 

of time after the switch is opened. 

3.561.3

® 


Deadband/I-Min. 

Spool-type proportional valves will normally have a certain 

amount of spool overlap which produces deadband. For 

pressure and flow controls this deadband will occur at the start 

of spool movement. For directional valves the deadband will 

occur around the center position. Spool overlap reduces 

leakage in the null position and also provides a greater degree 

of safety in power failure or emergency stop situations. The 

effect of spool overlap requires that a certain minimum signal 

level has to be present at the solenoid coil before any 

noticeable result occurs in the system. 

If this characteristic is undesirable, deadband can be eliminated 

or reduced (for pressure and flow controls) by setting a 

minimum current (I-Min.) on the controller/amplifier. When 

I-Min. is adjusted above the zero point, the valve spool will 

immediately jump to this setting when power is appled, 

eliminating the deadband. Please note that the I-Min. 

adjustment will affect the I-Max. setting, so it should always 

be set first. 

When controlling directional valves using a multifunction/dual 

solenoid driver, the deadband elimination function is normally 

activated using a dip switch. The amount of deadband jump is 

typically factory-set, and is application-specific. 

Current Feedback 

When a current passes through a solenoid coil, heat is 

generated. This heat increases the resistance of the coil. For 

example, a coil may have a resistance of seven ohms at 20°C, 

and a resistance of nine ohms at 100°C. This increased 

resistance causes a reduction in coil power which results in 

a lower valve setting. 

To compensate for temperature induced changes, some 

controller/amplifiers have a function known as “Current 

Feedback.” A current feedback resistor is added to the circuit 

in series with the solenoid coil. This allows the solenoid current 

to be proportional to the input signal voltage, and independent 

of the solenoid resistance. Power supply voltage must be 

sufficient to overcome the increased resistance. 

3.561.4

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