Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 239)

4-34 Commissioning
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
Snubber Capacitance (SGCT Device)
Turn the multimeter from the resistance to capacitance measurement
mode. Proceed to verify the snubber capacitor by measuring from the
test point to the chill block adjacent to the right.
Snubber Test Point
Measure capacitance
between cathode
chillblock and testpoint
Figure 4.6 – Snubber Capacitor Test
The capacitance measured is actually affected by the snubber
capacitor and other capacitance in the circuit, including capacitance
from the Gate Driver circuit. You are actually looking for a
consistent reading for all devices.
If the capacitor is found to be out of tolerance, refer to Chapter 6 –
Component Definition and Maintenance for detailed instructions on
how to replace the snubber capacitor.