Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 464)

7-26 Troubleshooting
7000A-UM150F-EN-P – June 2013 7000 “A” Frame
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
2U1A Fbk FO Loss 267 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
2U1B Fbk FO Loss 273
2U1C Fbk FO Loss 324
2U4A Fbk FO Loss 270
2U4B Fbk FO Loss 276
2U4C Fbk FO Loss 327
2V3A Fbk FO Loss 269
2V3B Fbk FO Loss 275
2V3C Fbk FO Loss 326
2V6A Fbk FO Loss 272
2V6B Fbk FO Loss 278
2V6C Fbk FO Loss 329
2W2A Fbk FO Loss 268
2W2B Fbk FO Loss 274
2W2C Fbk FO Loss 325
2W5A Fbk FO Loss 271
2W5B Fbk FO Loss 277
2W5C Fbk FO Loss 328
2U1A Gat FO Loss 279 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
2U1B Gat FO Loss 285
2U1C Gat FO Loss 330
2U4A Gat FO Loss 282
2U4B Gat FO Loss 288
2U4C Gat FO Loss 333
2V3A Gat FO Loss 281
2V3B Gat FO Loss 287
2V3C Gat FO Loss 332
2V6A Gat FO Loss 284
2V6B Gat FO Loss 290
2V6C Gat FO Loss 335
2W2A Gat FO Loss 280
2W2B Gat FO Loss 286
2W2C Gat FO Loss 331
2W5A Gat FO Loss 283
2W5B Gat FO Loss 289
2W5C Gat FO Loss 334