Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 437)

Troubleshooting 7-15
7000 “B” Frame 7000-UM150I-EN-P – June 2013
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
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.
Motor Heartbeat 167 The DCB-L has detected the loss of the
heartbeat signal from the DCB-M. – Verify DC Control voltages to both DCBs
– Possible Failed DCB – Check LED status
of both boards and compare with table in
the manual – Recycle power and replace
board if necessary
Motor Load Loss 74 The drive has detected a loss of load
condition. This is activated as a fault using
the parameter Load Loss Detect (P199),
and the necessary setpoints are Load Loss
Level (P246), Load Loss Delay (P231), and
Load Loss Speed (P259).
– Verify the parameter settings
– Ensure that the load should not normally
be in an unloaded condition
– This is designed for applications likely to
lose the load (downhole pump – hollow-
shaft motor) and we do not want to run
with the loss of load