Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 446)

7-24 Troubleshooting
7000-UM150I-EN-P – June 2013 7000 “B” Frame
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
U1A Online Flt 81 INVERTER 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
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
– 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
U1B Online Flt 87
U1C Online Flt 462
U4A Online Flt 84
U4B Online Flt 90
U4C Online Flt 465
V3A Online Flt 83
V3B Online Flt 89
V3C Online Flt 464
V6A Online Flt 86
V6B Online Flt 92
V6C Online Flt 467
W2A Online Flt 82
W2B Online Flt 88
W2C Online Flt 463
W5A Online Flt 85
W5B Online Flt 91
W5C Online Flt 466
2U1A Device Flt 291 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
2U1B Device Flt 297
2U1C Device Flt 336
2U4A Device Flt 294
2U4B Device Flt 300
2U4C Device Flt 339
2V3A Device Flt 293
2V3B Device Flt 299
2V3C Device Flt 338
2V6A Device Flt 296
2V6B Device Flt 302
2V6C Device Flt 341
2W2A Device Flt 292
2W2B Device Flt 298
2W2C Device Flt 337
2W5A Device Flt 295
2W5B Device Flt 301
2W5C Device Flt 340