Troubleshooting 3-27
7000-TD002A-EN-P – September 2007
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
2U1A DiagFbkLoss 282
2U1B DiagFbkLoss 288
2U1C DiagFbkLoss 294
2U4A DiagFbkLoss 285
2U4B DiagFbkLoss 291
2U4C DiagFbkLoss 297
2V3A DiagFbkLoss 284
2V3B DiagFbkLoss 290
2V3C DiagFbkLoss 296
2V6A DiagFbkLoss 287
2V6B DiagFbkLoss 293
2V6C DiagFbkLoss 299
2W2A DiagFbkLoss 283
2W2B DiagFbkLoss 289
2W2C DiagFbkLoss 295
2W5A DiagFbkLoss 286
2W5B DiagFbkLoss 292
2W5C DiagFbkLoss 298
PWM RECTIFIER SGCT FAULT
(Feedback Fiber-Optic Loss)
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. This fault occurs when the feedback
was low from the device before gating, and
is still low from the device after gating. The
drive then assumes the feedback must be
the problem.
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
– Verify that the Feedback Fiber-Optic
from the SCGT to the FOI board is not
damaged or disconnected
– Verify that the Gate Pulse has been
received by the SGCT board using
Gating Test Mode
– Complete a resistance check described
in Chapter 4, checking the devices,
sharing resistors, and snubber circuitry
– Replace all faulty components
– It is likely that the feedback fiber optic
cable is not plugged in or has been
damaged
2U1A Gating Loss 300
2U1B Gating Loss 306
2U1C Gating Loss 312
2U4A Gating Loss 303
2U4B Gating Loss 309
2U4C Gating Loss 315
2V3A Gating Loss 302
2V3B Gating Loss 308
2V3C Gating Loss 314
2V6A Gating Loss 305
2V6B Gating Loss 311
2V6C Gating Loss 317
2W2A Gating Loss 301
2W2B Gating Loss 307
2W2C Gating Loss 313
2W5A Gating Loss 304
2W5B Gating Loss 310
2W5C Gating Loss 316
PWM RECTIFIER SGCT FAULT
(Gating Fiber-Optic Loss)
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. This fault occurs when the feedback
was high from the device before gating, and
is still high from the device after gating. The
drive then assumes the gating pulse must
not have reached the 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
– Check that the fiber optic cables are
seated properly in the Optical Interface
Board and the SCGT firing card
– Check that the fiber optic cable is not
pinched or damaged
– 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 all the power connections to the
SCGT firing card are seated properly
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