VALVE GP-SELECTOR & PRESS CONT 6Y7824 - Caterpillar

Illustration 1 g01277295
Controls Cabinet Back Panel (29) Customer Contacts Interface Board #2 (Optional) (30) DC Bus Pre-charge Circuit Resistors (31) T1 - T4 Transformers (32) Power Supply Board (PWS) (33) Customer Contacts Interface Board #1 (34) Power Supply Board (PWS) (35) Thermistor (36) Fuse F69 (37) Fuses F88-F90, F70-F72 (38) Zig-Zag Transformer (39) K7 Pre-charge Contactor (40) K6 Pre-charge ContactorThe Power Supply Board in the Controls Cabinet supplies unregulated control power to all boards in the UPS1200 system.The input to each Power Supply Board is 21VAC. The voltage is rectified into unregulated dc. Each Power Supply Board has isolated and redundant rectifiers located on the same board. These rectifiers are paralleled through diodes in order to prevent a filter capacitor failure in one power supply to cause a failure in the other supply. Each power supply has a normally closed dry contact output in order to indicate to the APC2 that the power supply is correct.The PWS-1 also supplies the 24VDC to the UVR coil of the input breaker.A control relay and capacitor time constant are also located on the power supply as well. This circuit supplies power to the input breaker for up to 5 seconds after an outage at which time the breaker will open.Fuses
The type and function of the fuses are indicated in Table 1. Visually inspect the fuses. Replace the fuse if the fuse is blown.
Table 1
Power Supply Board Fuses    
Fuse    Type    
PWS-F1     30 A    
PWS-F2     30 A    
PWS-F3     250VAC, 3.15 A, Time Lag    
PWS-F4     250VAC, 3.15 A, Time Lag    Removal
Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in the static-shield bag. Follow