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Basic Installation and Operation
Guide
7.1 Failure Analysis - Continued
Problem
Phase Loss
Overload
Stall prevention
Under Voltage
Trip
Under Current
Trip
Self-test Failure
Line Frequency
Trip
Any Ground Fault
Trip
Motor stopped
during run
TOSHIBA
CPU OLED
LED
Display
PHASE LOSS
Trip
OVERLOAD
TRIP
Trip
ACCEL TIME
Trip
TRIP
UNDER
VOLTAGE
Trip
TRIP
UNDER
CURRENT
Trip
TRIP
SELF-TEST
Trip
FAILURE
OVER OR
UNDER
Trip
FREQUENCY
TRIP
GROUND
FAULT
HI-SET OR
Trip
LO-SET
Check for fault
Trip
indication
JKSSS Series Solid State Soft Starters
AUX
Possible Cause
Relay
Loss of 1 or more
phases of power from
utility or generated
AUX1
power.
Blown power fuses
Improper programming
AUX1
Possible load damage
or jammed load
Improper setting for
motor load condition
AUX1
Damaged load
Improper programming
Wrong position of
disconnected breaker
Main contactor failed to
AUX1
close
Transformer too small
Improper programming
AUX1
Unloaded motor
Failed CPU or Main
Firing Board
AUX1
Vibration
Generator Power
AUX1
Problem or grid change
Improper programming
Any wire going to
ground (e.g. stator
AUX1
ground, motor ground,
soft start ground)
High vibration or loose
connections
WARNING
!
This is a serious fault condition. Ensure that the fault condition
is cleared on the load side before attempting to restart the
AUX1
motor.
Load shorted
Faulty main circuit
board
Solutions
Check power source.
Check for short circuits.
Check motor nameplate versus
programmed parameters.
Check motor currents.
Verify current limit setting.
Check for load failure.
Check Setpoint settings.
Check disconnect or open breaker.
Check internal connections.
Reduce current limit setting,
saturation or
sagging power supply transformer.
Check setpoint settings.
Check load.
Contact factory.
Check internal wiring connections.
Troubleshoot and repair generator.
Contact utility company.
Main board failure.
Three phase power removed from
Main.
Check setpoint settings.
Check with megger or Hi-pot motor
leads and motor.
Check internal connections.
Remove power and repair.
Replace the main circuit board.
Cont.
82
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