Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 227)

Commissioning 4-53
7000 “A” Frame 7000A-UM150F-EN-P – June 2013
Put the drive in Gating Test Mode and the rectifier will automatically
go into Test Pattern gating mode.
LED 1 – Gate Pulse (Orange) should light up and pulsate at the
frequency that the device is firing. All the other LEDs will light up
as the firmware sends a gating signal to every SCR.
The Gating Test 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 should not be attempted for SCR rectifiers
as the test power from the power supply to the SPGD boards through
the wiring harness does not have sufficient current to drive all of the
boards at once.
During commissioning, it is not necessary to use an oscilloscope for
SCR firing tests, although it will be required if SCR firing problems
occur.
A T T E N T I O N A T T E N T I O N Ensure that the test cable is removed from the
drive and that it is taken out of Gating Test
prior to applying Medium Voltage. Failure to
do so may result in personal injury or
equipment damage.
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: