I.L. 17562
Page 119
PR 0.3 Effective 8/99
Table 12.2 Trip Conditions
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Probable Cause Solution
IOC
GND FLT
INSTANTANEOUS
OVERCURRENT TRIP
GROUND FAULT TRIP
Electrical fault (short circuit)
in insulation of motor or
connecting circuits.
Note: If a motor trips on
IOC at the moment of
starting, and an expert has
confirmed no fault, the trip
may be due to magnetic
inrush. Adjust IOC trip level
and start delay to ride
through inrush peak.
DANGER. Shut down
and lock out motor. Get
expert help in evaluating
condition of motor and
repair needs. Do not try
to restart without expert
evaluation.
After or during repair or
replacement of motor,
check fuses in starter
and replace blown fuses.
JAM LOAD JAM TRIP Malfunction or jam of the
driven process equipment.
Lock out motor starter
for safety. Check
process equipment.
UNDER L UNDER LOAD RUN
TRIP
Breakage or malfunction in
the process driven
equipment or drive shaft
Lock out motor starter
for safety. Check shaft
couplings, shaft keys for
breakage. Look for
blockage of process
material flow to motor-
driven equipment.
MB TEMP
LB TEMP
WD TEMP
AX TEMP
MOTOR BEARING
OVER TEMP TRIP
LOAD BEARING OVER
TEMP TRIP
STATOR WINDING
OVER TEMP TRIP
AUXILIARY OVER
TEMP TRIP
Bearings or bearing
lubrication system has
failed. Also, check RTD
integrity.
Sustained overloading of
motor or cooling air flow
blockage.
If RTD is OK, bearing
will probably need
replacement.
Check airflow path.
Look for cause of
abnormal loading.
Check for abnormal
supply voltage.
LRC/I2T LOCKED
ROTOR/THERMAL
OVERLOAD TRIP
The thermal-model bucket
has filled to the trip level.
Note: This trip cannot be
reset until the thermal-
model bucket has cooled
• Determine if the motor
is seeing larger than
expected sustained
loading.
• Check for unbalance
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