Snubber resistance (scr device) – Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) User Manual
Page 277
Rockwell Automation Publication 7000-UM151E-EN-P - January 2013
277
Snubber Testing Appendix C
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 260 - Snubber resistance test
Refer to
Figure 15 on page 272
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
for the snubber resistor assembly replacement
procedure.
Resistance value between Test Point
and heatsink to its left is snubber resistance
Heatsink
Heatsink
Sharing Resistance
Snubber Resistance
Snubber Capacitor
Testpoint
To Gate
Driver Board
Heatsink
Heatsink