3-28 Troubleshooting
7000-TD002A-EN-P – September 2007
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
2U1A Online 264
2U1B Online 270
2U1C Online 276
2U4A Online 267
2U4B Online 273
2U4C Online 279
2V3A Online 266
2V3B Online 272
2V3C Online 278
2V6A Online 269
2V6B Online 275
2V6C Online 281
2W2A Online 265
2W2B Online 271
2W2C Online 277
2W5A Online 268
2W5B Online 274
2W5C Online 280
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
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