3-32 Troubleshooting
7000-TD002A-EN-P – September 2007
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
2U1A OnlineShrt 354
2U1B OnlineShrt 360
2U1C OnlineShrt 366
2U4A OnlineShrt 357
2U4B OnlineShrt 363
2U4C OnlineShrt 369
2V3A OnlineShrt 356
2V3B OnlineShrt 362
2V3C OnlineShrt 368
2V6A OnlineShrt 359
2V6B OnlineShrt 365
2V6C OnlineShrt 371
2W2A OnlineShrt 355
2W2B OnlineShrt 361
2W2C OnlineShrt 367
2W5A OnlineShrt 358
2W5B OnlineShrt 364
2W5C OnlineShrt 370
3U1B OnlineShrt 420
3U4B OnlineShrt 423
3V3B OnlineShrt 422
3V6B OnlineShrt 425
3W2B OnlineShrt 421
3W5B OnlineShrt 424
4U1C OnlineShrt 426
4U4C OnlineShrt 429
4V3C OnlineShrt 428
4V6C OnlineShrt 431
4W2C OnlineShrt 427
4W5C OnlineShrt 430
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
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