Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) - Manual (Page 70)

66 Rockwell Automation Publication 7000-IN006B-EN-P - May 2013
Chapter 5 Commissioning the Drive
Snubber Capacitance (SCR Device)
Turn the multimeter from the resistance to capacitance measurement mode.
Proceed to verify the snubber capacitor by measuring from the test point and the
white wire at the 2-pole device snubber plug (labeled snubber).
Figure 41 - 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.
If the capacitor is found to be out of tolerance, refer to the PowerFlex 7000 ‘B’
Frame User Manual’s “Component Definition and Maintenance” section for
detailed instructions on how to replace the snubber capacitor.
Resistance between Test Point and white wire
at 2-pole plug is snubber capacitance
Sharing Resistance
Snubber Resistance Snubber Capacitor
Testpoint
To Gate
Driver Board
Heatsink Heatsink
Sharing Resistance
Snubber Resistance Snubber Capacitor
Testpoint
To Gate
Driver Board
Heatsink Heatsink