Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) Commissioning - ForGe Control - Manual (Page 74)

74 Rockwell Automation Publication 7000-IN012B-EN-P - June 2014
Chapter 4 Commissioning the Drive
While the drive is idle without gating, LEDs 4 (Green), 3 (Green), and 1 (RED)
should be on while LED 2 (Yellow) is off. If other combinations of LEDs are
illuminated, refer to publication
7000-UM202_-EN-P for instructions on
troubleshooting the SGCT firing cards.
When you put the drive into gating test mode, the inverter automatically enters
the test pattern gating mode. Monitor the SGCT LEDs and ensure that LEDs 4
(Green) and 3 (Green) remain on, while LEDs 1 (Red) and 2 (Yellow) toggle on
and off alternately at the converter’s operating frequency.
There is also a gating test that fires the individual devices one at a time, in what is
described as a Z-pattern. For each section, the top left device turns on for
2 seconds, then turns off. The next device to the right turns on for 2 seconds, and
the pattern continues. At the end of the first stack of devices, the right device in
the middle stack down fires, and the pattern continues right to left until reaching
the end of the middle stack. Then the left device in the bottom stack fires and the
pattern continues to the last device, then returns to the top.
This tests for correct fiber optic cables connected to the corresponding devices.
Normal gating test mode fires the inverter at the output frequency corresponding
to the active reference (speed) command.
System Test Prior to applying medium voltage, verify the entire low voltage control circuit to
ensure the drive operates as expected. Failure to perform this test may result in
damage to the drive or process in the event that the control does not operate as
expected. This section of the manual provides instruction for the following five
tests:
• System Test Mode
• Start/Stop Contactor Control
• Status Indicators
• Analog I/O
• Configurable Alarms
System Test Mode
This test mode enables the drive to operate the drive’s low voltage control circuit
without medium voltage present.
Drive status I/O is active while performing tests in this mode. If monitoring the
drive I/O remotely, notify process control in advance to avoid confusion.
ATTENTION: Isolate the drive from medium voltage prior to starting this test.
You must have advanced access permissions on the drive to perform this
operation.