Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 490)

7-52 Troubleshooting
7000A-UM150F-EN-P – June 2013 7000 “A” Frame
WARNING
MESSAGE
WARNING
CODE
DESCRIPTION RECOMMENDED ACTIONS
2U1A Offline SC 300 6P SCR RECTIFIER WARNING
(Offline Short-Circuit)
FOR REDUNDANT DEVICE CAPABILITY
ONLY
For SCR rectifiers, this warning will occur
after the initial contact closure, or during the
diagnostic sequence after a start command.
This is the first test on the rectifier. When all
devices blocking, the feedback from the
devices should toggle from open to short to
open every time the line voltage sine wave
passes through zero. If this is consistently
showing short (no feedback), then the drive
assumes that the device is Short-Circuited.
– 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
– NOTE: There is only the Redundant
option available on the Rectifier, and only
on 6P drives (SCR orPWM). You can
not have N-1 operation on the rectifier
since we can not control the line voltage.
2U1B Offline SC 306
2U1C Offline SC 318
2U4A Offline SC 303
2U4B Offline SC 309
2U4C Offline SC 321
2V3A Offline SC 302
2V3B Offline SC 308
2V3C Offline SC 320
2V6A Offline SC 305
2V6B Offline SC 311
2V6C Offline SC 323
2W2A Offline SC 301
2W2B Offline SC 307
2W2C Offline SC 319
2W5A Offline SC 304
2W5B Offline SC 310
2W5C Offline SC 322
2U1A Online SC 288 6P SCR RECTIFIER WARNING
(Online Short-Circuit)
FOR REDUNDANT DEVICE CAPABILITY
ONLY
For SCR rectifiers, this warning 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 warning 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 warnings. 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 warning 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
– NOTE: There is only the Redundant
option available on the Rectifier, and
only on 6P drives (SCR orPWM). You
can not have N-1 operation on the
rectifier since we can not control the line
voltage.
2U1B Online SC 294
2U1C Online SC 312
2U4A Online SC 291
2U4B Online SC 297
2U4C Online SC 315
2V3A Online SC 290
2V3B Online SC 296
2V3C Online SC 314
2V6A Online SC 293
2V6B Online SC 299
2V6C Online SC 317
2W2A Online SC 289
2W2B Online SC 295
2W2C Online SC 313
2W5A Online SC 292
2W5B Online SC 298
2W5C Online SC 316