LSIS 6731001500, User Manual

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567
Troubleshooting
Type Cause Remedy
problem. models with lower capacity.
The set value for underload level (PRT-
24) is less than the system’s minimum
load.
Reduce the set value for the underload
level.
Over
Current1
Acc/Dec time is too short, compared to
load inertia (GD
2
).
Increase Acc/Dec time.
The inverter load is greater than the
rated capacity. Replace the inverter with a model that has
increased capacity.
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
specified 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.