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Snubber resistance (scr device) – Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) User Manual

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Rockwell Automation Publication 7000-IN006B-EN-P - May 2013

65

Commissioning the Drive Chapter 5

Snubber Resistance (SCR Device)

Access to the snubber resistor is not required to test the resistance. The snubber
circuit test point is located within the PowerCage under the heatsinks. For each
device, there is one test point. To verify the resistance, measure the resistance
between the test point and the heatsink above.

Figure 40 - Snubber resistance test

If the resistor 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 resistor assembly.

Resistance value between Test Point
and heatsink to its left is snubber resistance

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