Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 201)

Commissioning 4-47
7000 “A” Frame 7000A-RM001A-EN-P – January 2011
SGCT Firing Test
Unlike the SCR Self-powered gate Driver Board, the SGCT has an
integrated firing circuit mounted on the device. The power for this
circuit is derived from the SGCT Power Supplies (IGDPS), and
preliminary observations are possible by monitoring the healthy
lights on the firing circuit without putting the drive into gating test
mode. There are 4 LEDs on the firing card. The following diagram
illustrates the location of the LEDs:
SGCT SGCT
LED 4 (Green)
LED 3 (Green)
LED 2 (Yellow)
LED 1 (Red)
Figure 4.15 – SGCT Healthy LEDs
While the drive is sitting idle, without gating LEDs 4 (Green), 3
(Green), and 1 (RED) should be illuminated while LED 2 (Yellow)
is off. If any other combinations of LEDs are illuminated, refer to
Chapter 5 – Component Definition and Maintenance, for instructions
on how to troubleshoot the SGCT firing cards.
Put the drive in Gating Test Mode and the inverter will automatically
go into the Test Pattern gating mode.
Monitor the SGCT LEDs and ensure that LEDs 4 (Green) and 3
(Green) remain illuminated, while LEDs 1 (Red) and 2 (Yellow)
toggle on an off alternately at the frequency that the converter is
operating at.