Displayed when the DB resistor usage rate exceeds the set value. Set
the detection level at Pr.66.
Tr tune error warning alarm is activated when Dr.9 is set to 4. The
warning alarm occurs when the motor’s rotor time constant (Tr) is
either too low or too high.
9.2 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.
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.
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
Reduce the set value for the underload
level.
Acc/Dec time is too short, compared to load
inertia (GD2).
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
The mechanical brake of the motor is
operating too fast.
Check the mechanical brake.
Deceleration time is too short for the load
inertia (GD2).
Increase the acceleration time.
A generative load occurs at the inverter
output.
The input voltage is too high.
Determine if the input voltage is above
the specified value.
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.
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