Tech. Explanations - Kendrion Binder

the technical background
Response delay (t 11 ):
is the time between switching on the energisation
current and the plunger beginning to move.
Travel time (t 12 ):
is the time taken by the plunger to move from its
initial position to its end position.
Release delay (t 21 ):
is the time between switching off the energisation current
and the plunger beginning to move back.
Return time (t 22 ):
is the time taken by the plunger to move from its end
position back to its initial position.
7. SI units and symbols used in equations
The SI units and symbols used in equations as given on
the product data sheets and in the technical data are
taken from DIN 1304. The most important variables
used in the design of the devices are listed on page 15.
8. Testing of solenoids
8.1 Test voltage
All KENDRION solenoids are tested to ascertain their
dielectric strength before leaving the factory. The test
voltages used are given in DIN VDE 0580 point 5.3.1.
8.1.2 Renewed voltage test
The voltage test carried out during routine testing
should not be repeated if it can be avoided. However,
if a second test is called for, e.g. as an acceptance
criterion, then this should be carried out with only 80%
of the test voltage given in Tab. 4 below.
9. Electromagnetic time constants ( )
and inductances (L)
The electromagnetic time constants (ms) for the initial
and end positions of the plunger are specified on the
product data sheets in order to determine the inductances
of DC linear solenoids. These time constants allow the
inductances to be calculated for various duty cycles and
rated voltages according to the following example:
Given:
Wanted:
Answer:
solenoid type LHS060...
duty cycle = 100%
rated voltage = 24 VDC
inductance LIP (H) for initial position of
plunger inductance LEP (H) for end posi
tion of plunger
input power P20 = 26 W
(specified on data sheet)
According to Ohm’s law, the resistance of the energisation
coil can be calculated from the input power as follows:
2 2 2
R = ——
U
= ———
24 [V ]
= 22 Ω
26 [W]
P 20
Inductance at initial position:
L IP =
Inductance at end position:
L EP =
- -3
IP · R = 4[ms] · 10 · 22 [Ω] = 88mH
EP · R = 4,3 [ms] · 10 · 22 [Ω] = 95mH
Make sure that the time constants are entered in milliseconds
(ms) for these calculations, i.e. time constant
values specified in seconds (s) must be multiplied by
10 -3 .
-3
10. Operating conditions
Our AC and DC linear solenoids are designed for the
following operating conditions:
10.1 An ambient temperature of 35°C. The minimum
ambient temperature is -5°C.
10.2 The Relative humidity of the air depends
on the ambient temperature and is approx. 50% at
35°C. Higher relative humidities are permissible at
lower temperatures. Consideration should be given to
the formation of condensation water.
10.3 Please adhere to our installation guidelines
when putting the devices into operation.
11. Service life
The service life of devices and associated wear parts
depends on the installation and operating conditions,
e.g. mounting position, load etc.
12. Notes for DC and AC linear solenoids
12.1 Installation
Connect the plunger to the machine part by means of
an interlocking, non-rigid link that allows sufficient
play.
12.2 Mounting position
Our DC linear solenoids can be mounted in any position.
The force transfer is preferably in the axial direction.
12.3 Putting into operation
The supply voltage must match the rated voltage as
given on the rating plate. The user is responsible for
observing the instructions and requirements described
in DIN VDE 0580 (July 2000).
Switching
frequency
Z
2
6
12
30
120
300
600
1200
3600
100% duty cycle
max.
coil ON time coil OFF time
s
s
no restriction
no restriction
40% duty cycle
max.
coil ON time coil OFF time
s
s
720
1080
240
360
120
180
48
72
12
18
4.8
7.2
2.4
3.6
1.2
1.8
0.4
0.6
25% duty cycle
max.
coil ON time coil OFF time
s
s
450
1350
150
450
75
225
30
90
7.5
22.5
3
9
1.5
4.5
0.75 2.25
0.25 0.75
Tab. 4
12.4 External forces
Make sure that the magnetic forces are always higher
than the external forces (adjust force–stroke characteristic
if necessary).
12.5 Fuse projection
According to Ohm’s law (P = U x I), the current consumption
[A] is calculated from:
P N IN = — [A]
U N
where PN = rated power (W), UN = rated voltage (V).
Therefore, the appropriate fuse can be selected according
to the current calculated.
12
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