Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 448)

7-26 Troubleshooting
7000-UM150I-EN-P – June 2013 7000 “B” Frame
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
2U1A Offline OC 366 6P or 18P SCR RECTIFIER FAULT
(Offline Open-Circuit)
For SCR rectifiers, this fault will occur after
the initial contact closure, or during the
diagnostic sequence after a start command.
After the Short-Circuit test described below,
the drive fires each device, and verifies that
the feedback from that device went low. If
the feedback does not go low, the drive
assumes the SCR must be Open-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 FOI board
transmitter to SCRGD board receiver
– Replace all faulty components
2U1B Offline OC 372
2U1C Offline OC 402
2U4A Offline OC 369
2U4B Offline OC 375
2U4C Offline OC 405
2V3A Offline OC 368
2V3B Offline OC 374
2V3C Offline OC 404
2V6A Offline OC 371
2V6B Offline OC 377
2V6C Offline OC 407
2W2A Offline OC 367
2W2B Offline OC 373
2W2C Offline OC 403
2W5A Offline OC 370
2W5B Offline OC 376
2W5C Offline OC 406
3U1B Offline OC 438
3U4B Offline OC 441
3V3B Offline OC 440
3V6B Offline OC 443
3W2B Offline OC 439
3W5B Offline OC 442
4U1C Offline OC 444
4U4C Offline OC 447