Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 500)

7-16 Troubleshooting
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
Motor Current UB 33 The measured current unbalance on the
drive output has exceeded Mtr I UB Trip
(P208) for the duration set in Mtr I UB Delay
(P214).
– Verify the current sensor wiring and
Burden Resistors from the Motor current
sensors
– Verify the HCS power
– Check the Motor Filter Capacitors for
balanced loading on all 3 phases. Refer
to Chapter 6 of the User‟s Manual for
detailed instructions on Testing Filter
Capacitors.
– Investigate the possibility of Motor
winding or cabling problems
Motor DC Link OV 17 DC Link Voltage on the motor side,
measured through the Voltage Sensing
Board, has exceeded Motor DC Overvoltage
Trip (P193) for the duration set in Motor DC
Overvoltage Delay (P194).
– Verify the motor is connected and the
Output Contactor is not open
– Verify there is no open SGCTs Complete
a Resistance and Firing check
– Check VSB circuit (grounds) through to
SCB-M
– Check Burden resistor values
– Check the trip parameter setting
Motor Flux UB 24 The measured Motor Flux has exceeded
Motor Flux Unbalance Trip (P585) for the
duration set in Motor Flux Unbalance Delay
(P586).
– Verify the VSB resistors are not open
and that they are balanced
– Check for the shorted Motor Filter
Capacitors. Refer to Chapter 6 of the
User‟s Manual for detailed instructions
on Testing Filter Capacitors.
– Check for a grounded phase on the drive
system using a megger test
Motor FOB ChA 53 This fault occurs if the Motor Fiber Optic
Interface Board A is not connected, but is
required based on the number of devices
specified (Motor Voltage Dependent).
– Improper parameter settings for Inverter
Series Devices
– Verify parameters
– Damaged FOI Board - Check the LED
status on the FOI board – replace if
necessary
– DCB-M pin damage – Inspect the pins on
the DCB-M and ensure there is no
damage – Replace the DCB-M if
necessary
Motor FOB ChB 54 This fault occurs if the Motor Fiber Optic
Interface Board B is not connected, but is
required based on the number of devices
specified (Motor Voltage Dependent).
Motor FOB ChC 55 This fault occurs if the Motor Fiber Optic
Interface Board C is not connected, but is
required based on the number of devices
specified (Motor Voltage Dependent).
Motor FOB ChA PS 56 The 5VDC power supply to the Motor Fiber
Optic Interface Board A from the Motor DCB
is not present.
Motor FOB ChB PS 57 The 5VDC power supply to the Motor Fiber
Optic Interface Board B from the Motor DCB
is not present.
Motor FOB ChC PS 58 The 5VDC power supply to the Motor Fiber
Optic Interface Board C from the Motor DCB
is not present.