BENSHAW Rsi S Series, Instruction Manual, Page: 349 / 398

337
Troubleshooting
Type Cause Remedy
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 specificed 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 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.
Output Phase
Open
The magnetic contactor on the output side
has a connection fault.
Check the magnetic contactor on the
output side.
The output wiring is faulty.
Check the output wiring.
Input Phase
The magnetic contactor on the input side
Check the magnetic contactor on the