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Rockwell Automation Publication 20P-TG004C-EN-P - September 2021
35
Component Test Procedures
Chapter 2
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
on page
.
If a low resistance is detected, replace the modules. See Field SCR and
Dual Diode Module Removal and Installation on page
.
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
on page
Table 10 - SCR/Dual Diode Module Anode to Cathode Junction Measurements
(+) 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