LS Industrial Systems SV-iE5 Series - Fault Remedy

Chapter 8. Troubleshooting and Maintenance
8-3
8.2 Fault Remedy
Caution
If any trouble occurs due to overcurrent, make sure to restart after eliminating the
causes because power semiconductor element inside the inverter may be broken.
Protective
function
Cause Remedy
Overcurrent
 Accel/Decel time is too short
compared to the inertia of the
load(GD
2
).
 Load is greater than the
inverter rating.
 Inverter output is issued when
the motor is free running.
 Output short circuit or ground
fault has occurred.
 Mechanical brake of the motor
is operating too fast.
 Increase the Accel/Decel
time.
 Replace the inverter with
appropriate capacity.
 Resume operation after
stopping the motor or use
P36 (Speed search).
 Check output wiring.
 Check the mechanical brake.
Ground fault
current

Ground fault has occurred at
the output wiring of the
inverter.
 The insulation of the motor is
damaged due to heat.
 Check the wiring of the
output terminal.
 Replace the motor.
Inverter
overload
 Load is greater than the
inverter rating.
 Torque boost scale is set too
large.
 Upgrade the capacity of
motor and inverter or reduce
the load weight.
 Reduce torque boost scale.
Overload trip
Inverter
overheat
 Cooling system has faults.
 Ambient temperature is too
high.
 Check for alien substances
clogged in the heat sink.
 Keep ambient temperature
under 40°C.
Condenser
overload

3-Phase product may have
one phase lost.
 Internal condenser was
outworn.
 Check whether wiring of
input power or inter-phase
voltage is abnormal.
 It’s almost time to replace or
it may happen when it is
used in hot temperature for a
long while. Contact after-
sales service.