BENSHAW RSi H2 Series - Troubleshooting Faults

Troubleshooting
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11.2 Troubleshooting Faults
When a fault 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
(PRT-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 (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.
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
Set an appropriate electronic thermal