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