Allen-Bradley 23PFC, Hardware Service Manual

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50 Rockwell Automation Publication 23PFC-TG001A-EN-P - March 2018
Chapter 3 Frame A Field Controller Part Replacement Procedures
Pulse Transformer and
Switching Power Supply
Circuit Board Replacement Remove the Pulse Transformer and Switching Power Supply Circuit
Board
The switching power supply circuit board is on the back of the pulse
transformer circuit board. You must remove both boards to replace either
board.
1. Read the General Safety Precautions on page 10 .
2. Remove power from the device (see page 33 ).
3. Remove the protective covers (see page 36 ).
4. Remove the control EMI shield and control board (see page 48 ).
5. For 60 A and 120 A field controllers, complete these steps:
a. Remove the four screws that secure the slotted air flow plate to the
top of the device.
b. Remove the fan cable from connector XV on the switching power
supply board and remove the plate.
5
= Torque Specification:
1.0 N•m (8.9 lb•in)