LSIS LSLV0055H100-4COFN - Page 540

Troubleshooting
526
Type
Cause
Remedy
The inverter supplied an output while
the motor was idling.
Operate the inverter after the motor
has stopped or use the speed search
function (CON-70).
The mechanical brake of the motor is
operating too fast.
Check the mechanical brake.
Over
Voltage
Deceleration time is too short for the
load inertia (GD
2
).
Increase the acceleration time.
A generative load occurs at the inverter
output.
Use the braking unit.
The input voltage is too high.
Determine if the input voltage is
above the specified value.
Low Voltage
The input voltage is too low.
Determine if the input voltage is
below the specificed value.
A load greater than the power capacity
is connected to the system ( a welder,
direct motor connection, etc.)
Increase the power capacity.
The magnetic contactor connected to
the power source has a faulty
connection.
Replace the magnetic contactor.
Low
Voltage2
The input voltage has decreased during
the operation.
Determine if the input voltage is
above the specified value.
An input phase-loss has occurred.
Check the input wiring.
The power supply magnetic contactor is
faulty.
Replace the magnetic contractor.
Ground Trip
A ground fault has occurred in the
inverter output wiring.
Check the output wiring.
The motor insulation is damaged.
Replace the motor.
E-Thermal
The motor has overheated.
Reduce the load or operation
frequency.
The inverter load is greater than the
rated capacity.
Replace the inverter with a model
that has increased capacity.
The set value for electronic thermal
protection is too low.
Set an appropriate electronic thermal
level.
The inverter has been operated at low
speed for an extended duration.
Replace the motor with a model that
supplies extra power to the cooling
fan.
Out Phase
The magnetic contactor on the output
Check the magnetic contactor on the