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Self-powered sgct power supply - sps, Board calibration, Test points – Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control User Manual

Page 101: Board calibration test points

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Rockwell Automation Publication 7000-UM202B-EN-P - June 2014

101

Component Definition and Maintenance

Chapter 3

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 connection
outputs. Snubber connection inputs are derived from opening the to SGCT
cathode connection and bringing these connections to the SPS board
(

Figure 90

).

Figure 90 - 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