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JKSSS+ Series - 81
JKSSS+ Series 2.3 - 4.2KV
Problem CPU LCD Display LED
Aux
Relay
Possible Cause Solutions
Loss of 1 or more
phases of power from
utility or generated power
Check power source
Blown power fuses Check for short circuits
Improper programming
Check motor nameplate versus
programmed parameters
Possible load damage or
jammed load
Check motor currents
Improper setting for
motor load condition
Verify current limit setting
Damaged load Check for load failure
Improper programming Check setpoint settings
Wrong position of
disconnected breaker
Check disconnect or open breaker
Main contactor failed to
close
Check internal connections
Transformer too small
Reduce current lim it setting, saturation
or sagging power supply transformer
Improper programming Check setpoint settings
Unloaded motor Check load
Failed CPU or Main Firing
Board
Contact factory
Vibration Check internal wiring connections
Troubleshoot and repair generator
Contact utilities company
Main board failure
Three phase power removed from
Main Board
Improper programming Check program setpoints
Any wire going to ground
(I.e. stator ground, motor
ground, soft start ground)
Check with megger or Hi-pot motor
leads and motor
High vibration or loose
connections
Check internal connections
Load shorted/ grounded/
faulted
Remove power and repair.
Faulty main circuit board Replace the main circuit board
Short in control circuit
Remove power, locate and remove
this short
Wrong control voltage
Apply the correct voltage to the control
circuit
UNDER CURRENT TRIP
Trip
AUX1
AUX1
Any Ground
Fault Trip
GROUND FAULT
HI-SET OR LO-SET
Trip
Under Voltage
Trip
UNDER VOLTAGE TRIP
Trip AUX1
Overload
OVERLOAD TRIP
Trip AUX1
Phase Loss
PHASE LOSS
Trip AUX1
Stall prevention
ACCEL TIME TRIP
Trip AUX1
Generator Power
Problem or grid change
AUX1
Self-test Failure
SELF-TEST FAILURE
Trip
Line Frequency
Trip
OVER OR UNDER
FREQUENCY TRIP
Trip AUX1
Under Current
Trip
Warning:
This is a serious fault condition. Ensure that the fault
condition is cleared on the load before attempting to restart the
motor.
Control circuit
fuses blow after
control power is
applied.
None None None
Motor stopped
during run
Check for fault indication Trip AUX1