Allen-Bradley 23PFC, Hardware Service Manual

Page: 27 / 150

Rockwell Automation Publication 23PFC-TG001A-EN-P - March 2018 27
Component Test Procedures Chapter 2
7. Remove the pulse transformer board. The switching power supply board
is mounted on the back of the pulse transformer board but does not
need to be removed from the pulse transformer board for this test.
• For frame A devices, see Pulse Transformer and Switching Power
Supply Circuit Board Replacement on page 50 .
• For frame B devices, see Remove the Pulse Transformer and
Switching Power Supply Circuit Boards on page 93 .
8. With a digital multimeter set for a “continuity check”, measure each
connection point on the pulse transformer board that is listed in Table 5 .
• For frame A device, see Figure 21 on page 132 for connector
locations.
• For frame B device, see Figure 23 on page 137 for connector
locations.
9. If any of the actual measurements are out of tolerance, replace the pulse
transformer board.
IMPORTANT Mark all connections and wires before removal to avoid incorrect
wiring during reassembly.
Table 5 - Load Pulse/Snubber Circuit Measurements
For SCR Measure
From To Meter reading Connector XY Pinout
1 KG1 XY-4 “open circuit”
4 KG4 XY-1
2 KG2 XY-5
5 KG5 XY-2
3 KG3 XY-6
6 KG6 XY-3
01 KG01 XY-1
04 KG04 XY-4
02 KG02 XY-2
05 KG05 XY-5
03 KG03 XY-3
06 KG06 XY-6
10
.
.
.
.
.
1