LS SV-iG5H Series, Manual, Page: 205 / 226

Troubleshooting & Maintenance
191
Tro
ub
le
-
sh
oo
tin
g
Keypad
display
Protective
functions
Descriptions
Operating
method when
the frequency
command is lost When inverter operation is set via Analog input (0-10V or 0-
20mA input) or option (RS485) and no signal is applied,
operation is done according to the method set in I62
(Operating method when the frequency reference is lost).
NTC open When NTC is not connected, outputs are cut off.
12.2 Fault remedy
Keypad display Cause Remedy
Overcurrent
When an overcurrent fault occurs, operation must be started after the cause
is removed to avoid damage to IGBT inside the inverter.
Accel/Decel time is too short compared
to the GD
²
of the load.
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 H22 (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