LS ELECTRIC LSLV-S100 Series, User Manual, Page: 199 / 270

190
Troubleshooting
5.2
Troubleshooting Fault Trips
When a fault trip or warning occurs due to a protection function, refer to the following table
for possible causes and remedies.
Type Cause Remedy
Over Load
The load is greater than the motor’s
rated capacity.
Ensure that the motor and inverter
have appropriate capacity ratings.
The set value for the overload trip level
(Pr.21) is too low.
Increase the set value for the
overload trip level.
Under Load
There is a motor-load connection
problem.
Replace the motor and inverter with
models with lower capacity.
The set value for underload level (Pr.29,
Pr.30) 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 (GD2).
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 (Cn.60).
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 (GD2).
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 (e.g., 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 Replace the inverter with a model