3-26 Troubleshooting
7000-TD002A-EN-P – September 2007
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
U1A Online 192
U1B Online 198
U1C Online 204
U4A Online 195
U4B Online 201
U4C Online 207
V3A Online 194
V3B Online 200
V3C Online 206
V6A Online 197
V6B Online 203
V6C Online 209
W2A Online 193
W2B Online 199
W2C Online 205
W5A Online 196
W5B Online 202
W5C Online 208
INVERTER SGCT FAULT
This fault will occur during running 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
Inverter Device Diagnostic Delay (P268),
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. The drive detected that the
diagnostic feedback from this device did not
match the gating pattern.
– 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
– For nuisance faults, contact the factory
about extending the Diagnostic Delay
2U1A Offline 318
2U1B Offline 324
2U1C Offline 330
2U4A Offline 321
2U4B Offline 327
2U4C Offline 333
2V3A Offline 320
2V3B Offline 326
2V3C Offline 332
2V6A Offline 323
2V6B Offline 329
2V6C Offline 335
2W2A Offline 319
2W2B Offline 325
2W2C Offline 331
2W5A Offline 322
2W5B Offline 328
2W5C Offline 334
PWM RECTIFIER SGCT FAULT
This fault will occur during the initial
contactor closure, the diagnostic sequence
after a start command, or the diagnostic
sequence after a stop command. The
rectifier monitors the state of the feedback
before a gate pulse is given, and monitors
the feedback after a gate pulse has been
sent. The SGCT has smart diagnostics, so
the feedback may indicate short before
firing, and if the pulse is received and the
device is really shorted, the diagnostic will
toggle the feedback to let you know the
problem is with the device, or the power
supply for that device.
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. The main example of this is closing
the input contactor on a shorted bridge.
– 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
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