Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 211)

4-52 Commissioning
7000-UM150I-EN-P – June 2013 7000 “B” Frame
SGCT SGCT
LED 4 (Green)
LED 3 (Green)
LED 2 (Yellow)
LED 1 (Red)
Figure 4.18 – 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 6 – Component Definition and Maintenance for instructions
on how to troubleshoot the SGCT firing cards.
Put the drive in Gating Test Mode the inverter will automatically go
into 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.
There is also a Gating Test that fires the individual devices one at a
time, in what is described as a Z-pattern. Basically, for each section,
the Top Left device will turn on for 2 seconds, then turn off. The
next device to the right will turn on for 2 seconds, and the pattern
will continue. When you reach the end of the first stack of devices,
the right device in the middle stack down will fire and the pattern
continues right to left until the end of the middle stack is reached.
Then the left device is the bottom stack will fire and the pattern will
continue to the last device, where it will then return to the top.
This is a test to show that the correct fiber optic cables are going to
the corresponding devices.
Normal Gating Test mode will fire the inverter at the output
frequency corresponding to the active reference (speed) command.