Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 90)

90 Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
Self-Powered SGCT Power
Supply - SPS This board is a component in drives that does not use the IGDPS module to
power the rectifier SGCTs. The SPS board extracts energy from the associated
SGCT snubber circuitry to provide the 20V DC required to power the SGCT
device.
The SPS Board has two snubber connection inputs and two 20V DC outputs.
Snubber connection inputs are derived from opening the snubber capacitor to
SGCT cathode connection and bringing these connections to the SPS board
(
Figure 77 ).
Figure 77 - Snubber Circuit for SGCT module (with SPS board)
Board Calibration
This board requires no field calibration.
Test Points
The green LED (DS1) on the SPS board indicates that the 20V DC output is
within operating specification range.
TP4 300V DC bus
TP6 300V DC bus common
TP15 20V DC output
TP14 20V DC output common
Rsn-2
Rsn-1
Anode
Cs-1
Rsh
Cs-2 Snubber
Resistor
Test
Cathode
Heatsink Heatsink
SPS Board
J1-1
J1-2