Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 511)

Troubleshooting 7-27
7000 “C” Frame 7000L-UM300I-EN-P – June 2013
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
2U1A Online Flt 255 PWM RECTIFIER SGCT FAULT
This fault will occur during operation of the
drive. The drive has detected that the
feedback from the device was not correct,
and does not wait to determine the exact
problem. The drive polls the entire bridge 3
times before and 3 times after each gating
command. All 6 of these readings for each
device must be consistent for the fault to
occur. There is also a parameter called
Rectifier Device Diagnostic Delay (P266),
which allows you to change the number of
consecutive firings to eliminate nuisance
faults. It will still poll 3 times before and
after each firing, but will now require the
condition to exist for the number of
consecutive firings set in the Diagnostic
Delay parameter for a fault to occur.
The firmware now completes a diagnostics
sequence immediately after any drive reset,
with the goal of detecting faults before any
destructive action is taken from the next
action
– Complete a resistance check per the
instructions in the manual
– NOTE: SGCTs may not have completely
shorted, and still could read in the kΩ
range – Any devices with low suspect
readings should be changed
– Check the LED status of the SCGT gate
driver card for abnormal readings
– Complete a Gating Test mode check on
the devices
– Verify the associated 20V power supply
is powered and active
– Verify all the power connections to the
SCGT firing card are seated properly
– Reset the drive and let the offline
diagnostics further define the problem
– For nuisance faults, contact the factory
about extending the Diagnostic Delay
2U1B Online Flt 261
2U1C Online Flt 318
2U4A Online Flt 258
2U4B Online Flt 264
2U4C Online Flt 321
2V3A Online Flt 257
2V3B Online Flt 263
2V3C Online Flt 320
2V6A Online Flt 260
2V6B Online Flt 266
2V6C Online Flt 323
2W2A Online Flt 256
2W2B Online Flt 262
2W2C Online Flt 319
2W5A Online Flt 259
2W5B Online Flt 265
2W5C Online Flt 322