Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020 203
Commissioning Chapter 4
Figure 187 - SCR Sharing Resistance Test
SCR Gate-to-cathode Resistance
One test that can be performed on SCRs that cannot be performed on SGCTs is
a Gate-to-cathode Resistance Test. Performing a Gate-to-cathode resistance
measurement will identify damage to a SCR by revealing either an open or
shorted gate-to-cathode connection. To test an SCR from gate-to-cathode,
disconnect the SCR gate leads from the self powered gate driver board and
measure the gate-to-cathode resistance on the SCR firing card Phoenix
connector as shown in Figure 188
.
Red Wire at
2-pole connector
Snubber Test Point
Red Wire at
2-pole connector
Snubber Test Point
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