Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 445)

Troubleshooting 7-23
7000 “B” Frame 7000-UM150I-EN-P – June 2013
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
U1A Fbk FO Loss 93 INVERTER SGCT FAULT
(Feedback Fiber-Optic Loss)
This fault will only occur during the initial
contactor closure and the diagnostic
sequence after a start command. The
inverter 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
– 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 the associated 20V power supply
is powered and active
– Verify all the power connections to the
SCGT firing card are seated properly
U1B Fbk FO Loss 99
U1C Fbk FO Loss 468
U4A Fbk FO Loss 96
U4B Fbk FO Loss 102
U4C Fbk FO Loss 471
V3A Fbk FO Loss 95
V3B Fbk FO Loss 101
V3C Fbk FO Loss 470
V6A Fbk FO Loss 98
V6B Fbk FO Loss 104
V6C Fbk FO Loss 473
W2A Fbk FO Loss 94
W2B Fbk FO Loss 100
W2C Fbk FO Loss 469
W5A Fbk FO Loss 97
W5B Fbk FO Loss 103
W5C Fbk FO Loss 472
U1A Gat FO Loss 105 INVERTER SGCT FAULT
(Gating Fiber-Optic Loss)
This fault will only occur during the initial
contactor closure and the diagnostic
sequence after a start command. The
inverter 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 the associated 20V power supply
is powered and active
– Verify all the power connections to the
SCGT firing card are seated properly
U1B Gat FO Loss 111
U1C Gat FO Loss 474
U4A Gat FO Loss 108
U4B Gat FO Loss 114
U4C Gat FO Loss 477
V3A Gat FO Loss 107
V3B Gat FO Loss 113
V3C Gat FO Loss 476
V6A Gat FO Loss 110
V6B Gat FO Loss 116
V6C Gat FO Loss 479
W2A Gat FO Loss 106
W2B Gat FO Loss 112
W2C Gat FO Loss 475
W5A Gat FO Loss 109
W5B Gat FO Loss 115
W5C Gat FO Loss 478