Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control User Manual
Page 515
Troubleshooting
7-31
7000 “C” Frame
7000L-UM300I-EN-P – June 2013
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION
RECOMMENDED ACTIONS
2U1A Online SC
354
6P or 18P SCR RECTIFIER FAULT
(Online Short-Circuit)
For SCR rectifiers, this fault will occur during
operation. Before an individual leg is fired,
the drive takes 5 samples of the voltage
across that device. This is because the
notching on the line could cause individual
readings to be low. If they are all low, the
device is assumed to be short-circuited and
a fault occurs. 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 check 5 times
before 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.
– For multiple device faults, the risk of a
line to line short exists, so tests with MV
isolated should be attempted
– Complete a resistance check on the
rectifier, including the gate-cathode
resistance, the snubber and sharing
resistors
– Complete a firing check on the rectifier
– Verify the snubber circuitry, and the
sharing resistors
– Verify fiber optic integrity from SCRGD
board transmitter to FOI board receiver
– Replace all faulty components
– For nuisance faults, contact the factory
about extending the Diagnostic Delay
2U1B Online SC
360
2U1C Online SC
396
2U4A Online SC
357
2U4B Online SC
363
2U4C Online SC
399
2V3A Online SC
356
2V3B Online SC
362
2V3C Online SC
398
2V6A Online SC
359
2V6B Online SC
365
2V6C Online SC
401
2W2A Online SC
355
2W2B Online SC
361
2W2C Online SC
397
2W5A Online SC
358
2W5B Online SC
364
2W5C Online SC
400
3U1B Online SC
426
3U4B Online SC
429
3V3B Online SC
428
3V6B Online SC
431
3W2B Online SC
427
3W5B Online SC
430
4U1C Online SC
432
4U4C Online SC
435
4V3C Online SC
434
4V6C Online SC
437
4W2C Online SC
433
4W5C Online SC
436