Motor Overload

What does Motor Overload mean?

The motor is experiencing a load that exceeds its rated capacity, especially when operating at low speeds with heavy loads. This can also result from excessively short acceleration/deceleration cycles or an incorrect motor rated current setting in the drive. Prolonged motor overload leads to winding overheating and potential damage to the motor insulation.

• Sustained mechanical load on the motor exceeds its rated output, causing prolonged high current draw.
• Motor current protection settings (e.g., Parameter E2-01 for motor rated current, C2-02 for overload warning level) are incorrectly configured or too low.
• Excessively short acceleration time (Parameter C1-01) or deceleration time (Parameter C1-02) causing high transient currents during ramps.
• Motor cooling is inadequate, especially when operating at low speeds, reducing its effective continuous power rating.
• Drive output filter (Parameter C2-03) or motor thermal model (Parameter C2-04) settings do not accurately reflect the connected motor's characteristics.

Click steps to track your progress.

1. 1

   1. Verify the mechanical load on the motor; check for any binding, obstruction, or increased friction in the driven equipment.

2. 2

   2. Confirm that the motor rated current (Parameter E2-01) and motor rated voltage (Parameter E2-02) are correctly set according to the motor's nameplate data.

3. 3

   3. Increase the acceleration time (Parameter C1-01) and deceleration time (Parameter C1-02) by 10-20% to reduce transient current peaks.

4. 4

   4. Monitor motor current (e.g., using drive display or clamp meter) during typical operation to determine average and peak current draw relative to the motor's rated current.

5. 5

   5. Check for proper motor cooling, ensuring fan is operational and motor fins are clean, especially for applications involving low-speed operation.

6. 6

   6. Review motor thermal protection settings (e.g., C2-02, C2-04) to ensure they are appropriate for the application and motor type.