GE DS200DCFBG2B DC Feedback Power Supply Board

GE DS200DCFBG2B DC Feedback Power Supply Board

Functional Description

The DCFB board receives 38 V ac (±10%) from the CPT (24 V dc). This voltage is full-wave rectified and

filtered to produce the unregulated ±24 V dc outputs. The +24 V dc output is rated at 3 A and the –24 V dc

output is rated at 1 A.

Regulators on the DCFB board derive ±15 V dc from the ±24 V dc supplies. The ±15 V dc outputs are each

rated at 0.8 A, of which 0.25 A is available for external loading.

The DCFB board also generates a +5 V dc, 4 A output from the +24 V dc supply. The /PSEN signal on 2PL

goes to a TTL low state when the +5 V dc supply is in regulation and the signal goes high if the +5 V dc

supply goes out of regulation. When high, /PSEN generates a microprocessor reset on the Drive Control

Card (SDCC/LDCC).

The DCFB board provides isolated +5 and ±15 V dc supplies to power the armature current feedback

circuits.

The power supply outputs are protected against short circuits by fuses FU2 and FU3 (7 A, 2AG). Light-

emitting diodes (LEDs) CR51 and CR55 provide blown fuse indication for these fuses. The 115 V ac output is

protected by fuse FU1 (1/2 A, 2AG). Neon light LT1 provides blown fuse indication for FU1.

Technical Specifications