88 Rockwell Automation Publication 7000-UM202D-EN-P - May 2018
Chapter 2 Power Component Definition and Maintenance
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 module 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 78 - Snubber Resistance Test
See Table 4 on page 83 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, see page 76
for the snubber
resistor assembly replacement procedure.
To Gate Driver Board
Heatsink
Heatsink
Snubber
Resistor
Snubber
Capacitor
Sharing Resistor
Test Point
Resistance value between test point and
heatsink to its left is snubber resistance
To Next Page
Loading...
