Eaton Cutler-Hammer MP-3000 - Page 117

I.L. 17562
Page 117
PR 0.3 Effective 8/99
Table 12.1 Alarm Conditions
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Message
Probable Cause Solution
GND FAULT GROUND FAULT
ALARM
Insulation failure -
ground current
leakage
DANGER. Personnel
hazard. Stop and isolate
motor as soon as
possible to avoid more
dangerous or damaging
fault. Get expert
evaluation of motor
insulation condition.
%I2T I2T ALARM The thermal-model
bucket level has
exceeded the alarm
setpoint (60 to 100%
of trip level).
• 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.
• Monitor the bucket
level in Monitor mode to
be sure level does not
continue to rise to trip
level.
STEX A ALLOWED STARTS
EXCEEDED, WAIT IN
MINUTES
All of the allowed
count of starts in the
set time period have
been used.
Wait the number of
minutes shown on the
display before restarting.
WD TEMP
MB TEMP
LB TEMP
AX TEMP
STATOR WINDING
TEMPERATURE ALARM
MOTOR BEARING
TEMPERATURE ALARM
LOAD BEARING
TEMPERATURE ALARM
AUXILIARY OVER
TEMPERATURE ALARM
In each case, the
temperature is equal
to or greater than the
alarm setpoint value.
Check the problem
value in the Monitor
mode and determine the
cause.
Stator heat may be due
to overload, or to cooling
air flow blockage.
Bearing heat usually
indicates impending
failure or lack of
lubrication.
PH UNBAL
JAM
PHASE UNBALANCE
ALARM
LOAD JAM ALARM
The electrical value
has crossed the alarm
threshold.
For unbalance, check
source voltage balance,
single-phase external
loads, and uncleared
unbalanced faults.