Rockwell Automation PowerFlex 7000 Technical Data Manual page 306

3-18 Troubleshooting
FAULT FAULT
MESSAGE CODE
Motor OvrVoltage 97
Motor Protection 35
Motor Slip Range 106
Motor Stall 103
7000-TD002A-EN-P – September 2007
DESCRIPTION
The measured motor voltage Stator Voltage
(#P344) has exceeded the Mtr OvrVolt Trip
(P181) setting.
Standard External Fault/Warning Input
included allowing the end-user to install a
protective relay (IE Bulletin 825 Motor
Protection Relay) auxiliary contact that can
activate a drive fault or warning, depending
on configuration of Motor Prot Class (P443).
Incorrect motor RPM has been entered for
an induction motor. Check the name plate
data. Motor RPM cannot be the
synchronous RPM. Enter the correct data
and cycle control power.
The drive has detected a motor stall
condition, with a delay set by Motor Stall
Delay (P191). The different methods of
Motor Stall detection depend on whether a
tachometer/encoder is installed or not.
Sensorless faults involve the motor not
building up enough flux feedback to be
detected by the drive, while tachometer
feedback methods look at the difference
between the tachometer/encoder feedback
and the speed command.
RECOMMENDED ACTIONS
– Parameter setting incorrect (flux
command/trip values)
– VSB damage – Check VSB resistors,
grounds, and verify tap settings are
correct
– Self-Excitation – Check for flying
start/induced motor rotation
– Make sure motor is not started in open
circuit.
– Make sure drive is not started in open
circuit. Verify Motor is connected.
– Check device responsible for the
auxiliary contact to this input and
investigate the fault indicated by the
device's fault message
– Investigate internal and external causes
for this fault code
– Check the 120V signal through the
external device. Check the XIO board
inputs and parameter status bits
– This fault can not be reset until correct
slip is programmed.
– If the motor nameplate shows
synchronous rpm, then verify what the
rated slip rpm is, subtract the slip rpm
from synchronous rpm.
Possible Causes:
– Insufficient torque on starting– Increase
Torque Command 0 and 1 to avoid motor
stalls when starting if Speed Feedback
Mode is Sensorless
– Insufficient torque – Increase Torque
Limit Motoring to avoid motor stalls while
running
– Reverse Load Rotation – Ensure the
load is not rotating in the opposite
direction
– Capture flux feedback voltModel (P342)
parameter
– Ensure Tachometer Feedback is
functional where applicable
– Ensure the motor is not spinning forward
at a speed greater than Reference
Command
– While running – make sure there is no
sudden increase of the load.