Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 469)

Troubleshooting 7-31
7000 “A” Frame 7000A-UM150F-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