Rockwell Automation Allen-Bradley PowerFlex 4M, Hardware Service Manual

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34 Rockwell Automation Publication 20P-TG003B-EN-P - September 2021
Chapter 2 Component Test Procedures
7. Check the anode to cathode junction of the field SCR/dual diode module.
With the digital multimeter set to “diode test”, measure the resistance
across the modules. See
Table 10 and Figure 10 below.
If a low resistance is detected, replace the modules. See Field SCR and
Dual Diode Module Removal and Installation on page 72 .
If a measurement results in an “infinity” reading, check the fuses at FU1
and FV1 on the control panel to determine if they are open. See
Figure 11
on page 35 .
Table 10 - Field SCR/Dual Diode Module Anode to Cathode Junction Measurements
Figure 10 - Field Terminal Block Location
(+) Meter Lead (-) Meter Lead Nominal meter reading:
Terminal Terminal
U1 C1 0.45V
U1 D1 open or infinity
V1 C1 open or infinity
V1 D1 open or infinity
C1 D1 open or infinity
C1 U1 open or infinity
C1 V1 open or infinity
D1 C1 0.9V
D1 U1 0.45V
D1 V1 open or infinity
V1 U1 C1 D1
W phase - AC input terminal