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Effective 10/02For more information visit: www.cutler-hammer.eaton.comIL17562BH04
Display
UNDER L
MB TEMP
LB TEMP
WD TEMP
AX TEMP
LRC/I2T
INC SEQ
ZSW TRIP
Complete Help Message
UNDER LOAD RUN TRIP
MOTOR BEARING OVER TEMP
TRIP
LOAD BEARING OVER TEMP
TRIP
STATOR WINDING OVER TEMP
TRIP
AUXILIARY OVER TEMP TRIP
LOCKED ROTOR/THERMAL
OVERLOAD TRIP
INCOMPLETE SEQUENCE TRIP
ZERO SPEED SWITCH INPUT
FAILED TO BE FALSE WITHIN
1/2 OF LOCKED ROTOR TIME,
OR WAS FALSE AT START.
Probable Cause
Breakage or malfunction in the
process driven equipment or drive
shaft
Bearings or bearing lubrication
system has failed. Also, check RTD
integrity.
Sustained overloading of motor or
cooling air flow blockage.
The thermal-model bucket has filled
to the trip level.
Note: This trip cannot be reset until
the thermal-model bucket has
cooled (emptied) below the user-set
I2T alarm level. This time depends
on motor nameplate values entered
as settings.
Discrete input 2 has been set for
the incomplete sequence timing
function via setting P7L1. The 120
Vac feedback signal from the
process or starter, expected within
the user-set time delay, was not
received in time after the start or
transition.
Also, the discrete input 2 must
remain energized during the run
cycle, until the motor stops. An
interruption over 25 cycles will
cause an incomplete sequence trip.
Discrete input 1 has been set for
zero-speed switch sensing via
setting P6L1. The 120 Vac zero
speed switch contact input was not
present at the moment of the start;
or it did not go away in one-half of
the set locked rotor or stall time
P1L3. This may be due to a motor
which is unable to start spinning
when it is energized.
Solution
Lock out motor starter for safety.
Check shaft couplings, shaft keys for
breakage. Look for blockage of
process material flow to motor-driven
equipment.
If RTD is OK, bearing will probably
need replacement.
Check airflow path. Look for cause of
abnormal loading. Check for abnormal
supply voltage.
•Determine if the motor is seeing larger
than expected sustained loading.
•Check for unbalance in supply
currents or voltages causing negative-
sequence heating.
•Check for abnormal system voltage
level.
•Check for cooling air blockage or
abnormal ambient.
•Check to be sure this function has
been intentionally enabled.
•Check process feedback wiring to be
sure 120 Vac signal is delivered in the
expected time.
• Use DI 2 test to confirm that relay sees
input.
•Check setting P5L8 against process
feedback time.
•Check setting P5L9 to be sure correct
timing start point is selected - start or
transition.
•If timing from transition, be sure
transition current and time settings
are correct.
•Check to be sure this function has
been intentionally enabled.
•If ZSW trip occurs at the moment of
starting, check process wiring and
contact to be sure 120 Vac signal is
delivered to DI 1 when the motor is
stopped.
•Check to be sure the motor isn’t
stalled and actually begins to spin.
• If ZSW trip occurs after 1/2 the locked
rotor time setting, check to be sure
the contact on the motor opens and
the 120 Vac signal goes away before
this time. Usually, a zero-speed
switch should open when the motor
has reached 5% to 10% of its normal
running speed.
• Use DI 1 test to confirm that the relay
sees the expected input voltage.
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