Motor overload

What does A783 mean?

The motor current is too high, indicating an overload condition on the motor. This can lead to motor overheating, winding damage, and reduced motor lifespan if sustained. The drive will eventually trip to protect the motor.

• Mechanical overload on the driven machine exceeding the motor's rated capacity (e.g., jammed conveyor, worn bearings).
• Incorrect motor parameters set in the drive (e.g., `P07.01` (Motor nominal current) or `P07.03` (Motor nominal speed) are incorrect, leading to inaccurate overload calculation).
• Drive's overload protection parameters are set too sensitively (e.g., `P30.01` (Motor thermal model time constant) is too low).
• Motor cooling fan failure or blocked air vents on the motor causing actual overheating at rated load.
• Motor current measurement circuit in the drive is faulty, leading to false high current readings.

Click steps to track your progress.

1. 1

   Measure the actual motor current with a clamp meter (e.g., `Fluke 376`) during operation and compare it to the drive's displayed current (e.g., `r01.03` (Motor current actual)).

2. 2

   Verify all motor nameplate data (e.g., `Motor nominal current`, `Motor nominal voltage`, `Motor nominal speed`) are accurately entered into drive parameters (e.g., `P07.01`, `P07.02`, `P07.03`).

3. 3

   Inspect the mechanical load connected to the motor for any binding, friction, or obstruction that could be increasing torque demand.

4. 4

   Check the motor's cooling fins and fan for blockage or damage, ensuring adequate airflow for heat dissipation.

5. 5

   Adjust the motor thermal model parameters (e.g., `P30.01` (Motor thermal time constant)) if the motor application involves short-term overloads, after verifying actual motor temperature.