Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) - Manual (Page 268)

268 Rockwell Automation Publication 7000-UM151E-EN-P - January 2013
Appendix C Snubber Testing
SGCT Testing
The following steps outline how to verify SGCT semiconductors and all
associated snubber components. A quick reference to the expected resistance and
capacitance values as well as a simple schematic diagram is located in the table
below. A simple schematic diagram in
Figure 252 on page 268 shows how the
snubber components are connected across an SGCT.
¹— 2300V drives will not have a sharing resistor on devices.
Figure 252 - SGCT Snubber Circuit Connections
SGCT Rating Sharing Resistor
¹
Snubber Resistor Snubber Capacitor
1500 Amp 80kΩ 6Ω (AFE Rectifier) 0.2µf
1500 Amp 80kΩ 7.5Ω (Inverter) 0.2µf
800 Amp 80kΩ 10Ω 0.1µf
400 Amp 80kΩ 15Ω (AFE Rectifier) 0.1µf
400 Amp 80kΩ 17.5Ω (Inverter) 0.1µf