Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) Commissioning - ForGe Control - Manual (Page 57)

Rockwell Automation Publication 7000-IN012B-EN-P - June 2014 57
Commissioning the Drive Chapter 4
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 heat sinks. For each
device, there is one test point. To verify the resistance, measure the resistance
between the test point and the heat sink above.
Figure 42 - Snubber resistance test
Refer to Table 2 on page 52 to determine the appropriate snubber resistance value
for the current rating of the SCR used.
If the resistor is found to be out of tolerance, refer to publication 7000-UM202_-
EN-P for the snubber resistor assembly replacement procedure.
Heatsink Heatsink
To Gate Driver Board
Heatsink
Heatsink
Snubber
Resistor Snubber
Capacitor
Sharing Resistor
Test Point
Resistance value between test point and
heat sink to its left is snubber resistance