Model CXP-3 Type C Track Circuit Uninterruptable Power Supply
Model CXP-3 Type C Track Circuit Uninterruptable Power Supply
Model CXP-3 Type C Track Circuit Uninterruptable Power Supply
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Safetran Systems<br />
Instruction<br />
& Maintenance<br />
<strong>Model</strong> <strong>CXP</strong>-3<br />
<strong>Type</strong> C <strong>Track</strong> <strong>Circuit</strong><br />
<strong>Uninterruptable</strong> <strong>Power</strong> <strong>Supply</strong>
Instruction & Maintenance<br />
<strong>Type</strong> C <strong>Track</strong> <strong>Circuit</strong><br />
<strong>Uninterruptable</strong> <strong>Power</strong> <strong>Supply</strong><br />
Contents<br />
Introduction..........................................................................................................................2<br />
Specifications.......................................................................................................................3<br />
Installation............................................................................................................................4<br />
TroubleShooting...................................................................................................................5<br />
Replacement Parts...............................................................................................................6<br />
Schematic.............................................................................................................................7<br />
Notes....................................................................................................................................8<br />
I & M 010350-13<br />
New 2/95
<strong>Model</strong> <strong>CXP</strong>-3 <strong>Type</strong> C <strong>Track</strong> <strong>Circuit</strong><br />
<strong>Uninterruptable</strong> <strong>Power</strong> <strong>Supply</strong><br />
The model <strong>CXP</strong>-3 <strong>Type</strong> C <strong>Track</strong> <strong>Circuit</strong> <strong>Uninterruptable</strong> <strong>Power</strong> <strong>Supply</strong> (UPS) employs a<br />
track feed transformer, power transfer relay, and standby inverter in a single housing.<br />
The <strong>CXP</strong>-3 acts as a track feed transformer when the circuit is operated with 115 VAC<br />
input power. In the event of AC power interruption, the <strong>CXP</strong>-3 converts standby battery<br />
power to an output voltage of the same RMS value as the output under normal<br />
operating conditions. The output voltage is proportional to the input voltage.<br />
The inverter runs in the standby mode. It is turned on by an internal power transfer<br />
relay in the event of the AC input power being lost. The inverter uses rugged MOSFET<br />
power transistors with the highest available current rating. The operating frequency is<br />
kept to within 1 Hz of nominal under any voltage, load, or temperature condition. Surge<br />
protection for the solid state circuitry consists of seven separate stages, including<br />
MOV's, Transorbs, Zeners, inductors and capacitors. All electronics are isolated from<br />
the chassis, giving a 3000 VAC breakdown voltage.<br />
The model <strong>CXP</strong>-3 is capable of operating up to 4 track circuits through 4 separate<br />
outputs of 6.3 VAC and 3.5 amperes each. Inputs are provided for both 115 VAC<br />
commercial power and 12 VDC standby battery power. The inverter unit is of a high<br />
efficiency design to maximize run time on the battery in the event of power failure.<br />
The model <strong>CXP</strong>-3 measures 8 inches in height, 5-1/4 inches in width, 9 inches in depth<br />
and weighs 15 pounds. It can be mounted on a standby relay rack, backboard, or shelf.<br />
2
Specifications<br />
Electrical:<br />
Input Current: no load .25A<br />
half load 3.5A<br />
full load 6.5A<br />
Input Voltage: 12.8V<br />
Output Voltage: no load 7.3VAC<br />
half load<br />
6.2VAC<br />
full load<br />
5.6VAC<br />
Output Current:<br />
3.5A Maximum<br />
Efficiency: 1/4 load 70%<br />
half load 89%<br />
Output Wave:<br />
Square<br />
Frequency: no load 60.0Hz<br />
half load<br />
60.0Hz<br />
full load<br />
60.0Hz<br />
Physical:<br />
Ambient<br />
Temperature: maximum 159.8° F (71° C)<br />
Dimensions: height 9 inches<br />
width 5-1/4 inches Exclusive of mounting tabs or terminals<br />
depth<br />
9 inches<br />
3
Installation<br />
1. The <strong>Model</strong> <strong>CXP</strong>-3 should be rack, wall or shelf mounted within a dry, well ventilated<br />
housing. Four #10 wood screws are provided.<br />
2. Connect the battery to the input terminals being careful to observe the proper polarity.<br />
A buzzing sound should be audible indicating that the inverter is working properly.<br />
Leads between the battery and power supply should be No.9 AWG at minimum and<br />
should be as short as practicable.<br />
3. Measure the AC output voltage across the output terminals. The value read should be<br />
in accordance with the no load specification value. Note that the output voltage will vary<br />
proportionally with the input voltage applied.<br />
4. Connect the load to the output terminals and again measure the AC voltage to make<br />
certain that it is satisfactory.<br />
5. With power off, connect commercial AC power to the <strong>CXP</strong>-3 unit between terminals BX<br />
and CX as labeled on the cover. Once the power is applied, the internal power transfer<br />
relay will pick up, removing power supplied to the inverter and therefore eliminating the<br />
buzzing sound created by the inverter.<br />
6. Again measure the AC output voltage across the output terminals to make certain that it<br />
is satisfactory.<br />
7. Surge protection for track circuits and AC line should be provided in accordance with<br />
Railroad Standard Practice. See application drawing below for recommended surge<br />
protection.<br />
MODEL 485-28<br />
CLEARVIEW®<br />
LIGHTENING ARRESTER<br />
(#022485-28X)<br />
1T 2T 3T<br />
MODEL 700-1<br />
HEAVY DUTY EQUALIZER<br />
(#022700-1X)<br />
1TR 2TR 3TR<br />
DC MODEL <strong>CXP</strong>-3 POWER SUPPLY<br />
AC<br />
115 VAC/12 VDC INPUT<br />
MODEL SP19-2A<br />
SURGE PROTECTION NETWORK<br />
(#010806-3AX)<br />
EQUIPPED WITH A MODEL 700-1<br />
HEAVY DUTY EQUALIZER<br />
(#022700-1X)<br />
MODEL SP20-2A<br />
SURGE PROTECTION NETWORK<br />
(#010807-6AX)<br />
EQUIPPED WITH A MODEL 701-1<br />
AC LINE PROTECTOR<br />
(#022701-1X)<br />
4
Trouble Shooting<br />
Trouble encountered with the <strong>CXP</strong>-3 will generally be contained within the internal solid<br />
state inverter as a result of low or no output. The following causes may be responsible and<br />
steps are outlined to isolate the cause.<br />
1. Low output or loss of output<br />
Check the input to see that it is close to its nominal value. The output AC voltage will<br />
vary directly with the input DC voltage. If a low input voltage is responsible, this<br />
condition must be corrected. Considerable drop in voltage may occur in the leads<br />
between the battery bus and inverter under heavy load conditions. It is for this reason<br />
that heavy gauge wire and short leads are recommended on the input.<br />
2. Excessive or short circuited load<br />
If this cause is suspected, remove the load and measure the no load voltage of this<br />
output. Check to be sure the fuses have not blown. Always replace with fuses of the<br />
same type and rating. This reading should be consistent with the no load specification<br />
values. If the no load conditions are proper, connect the load through an AC ammeter<br />
to see if the drain is excessive. A load current greater than 3.5A per output indicates a<br />
faulty or excessive load. Note that at full load the input current requirement may be as<br />
much as 10.0A. The battery must be kept well charged to insure that input voltage will<br />
be maintained with this load. With a short circuit or very high current load, either fuse<br />
can be blown.<br />
5
<strong>Model</strong> <strong>CXP</strong>-3 <strong>Type</strong> C <strong>Track</strong> <strong>Circuit</strong><br />
<strong>Uninterruptable</strong> <strong>Power</strong> <strong>Supply</strong><br />
Replacement Parts<br />
To Order: Specify Description and Part Number<br />
Description<br />
Part<br />
No.<br />
Qty.<br />
Req'd<br />
Schematic <strong>Power</strong> <strong>Supply</strong> <strong>CXP</strong>-3 010350-10 1<br />
Side Wrap <strong>CXP</strong>-3 <strong>Power</strong> <strong>Supply</strong> 010350-9 1<br />
Top Wrap Inverter 010247-9 1<br />
Transformer 88 VA 010247-88 1<br />
Choke Coil #11 Wire 10" Leads 010802-7L 1<br />
Insulating Shield 1-7/16 W/1 Slot 023408-14 2<br />
Insulating Cap 023408-13 2<br />
Fuse Holder 010019-9 2<br />
Fuse 3AG 15 Amp 010350-8 1<br />
Fuse 3AG 1.5 Amp 010350-6 1<br />
Varistor 24 Volt 010900-51 4<br />
Varistor 150 Volt 010900-45 1<br />
PC Board Assembly <strong>CXP</strong>-3 w/Lead 010247-10X1 1<br />
Wire<br />
Transorb Assembly Unidirectional 010247-16X 1<br />
Relay 120VAC P&B #PM17AY 010350-11 1<br />
Screw Wood RD #10 x 3/4 Stl Zinc 5730-RSC 4<br />
6
Schematic<br />
7
Notes<br />
8
Safetran Systems<br />
Safetran Systems Corporation<br />
4650 Main Street N.E.<br />
Minneapolis, MN 55421<br />
(612) 572-0466