206 Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
Chapter 4 Commissioning
Figure 190 - Snubber Capacitance Test
To test the snubber capacitance, disconnect the plug of the self-powered gate
driver board labeled SHARING and SNUBBER. The resistance between the
white wire of the plug and the Test Point to its left is the snubber capacitance.
Refer to Ta ble 7
to determine the appropriate snubber capacitance value for the
current rating of the SCR used. You should read the actual snubber capacitor
value shown in the table.
If the capacitor is found to be out of tolerance, refer to
Component Definition
and Maintenance on page 265 (Chapter 5) for detailed instructions on how to
replace the snubber capacitor.
Control Power Tests
Although there are a variety of options available to customers that will effect the
control power distribution within the drive, the input will always be as illustrated
in Figure 191
.
Snubber Test Point
White wire at
2-pole connector
Snubber Test Point
White wire at
2-pole connector
Prior to energizing the drive, verify that the control power being fed into the
input breakers is rated as designated on the electrical diagram.
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