To protect against motor overheating, it is essential to understand and keep the motor temperature under control. The connection between the motor running speed and load capacity must be known (load capacity curves). To ensure safe operation, the motor and drive combination needs to be sized correctly, so it does not exceed the load capacity curve, and rating plate information must be followed. To protect against motor heating, ABB recommends some possible solutions:
- A separate constant speed fan to increase cooling capacity and load capacity at low speeds.
- Directly measuring the motor’s surface temperature and using the data to control the shutdown of that motor.
- Monitoring and controlling the power fed to the motor.
- Limiting the load on the motor to pr event loads that cause higher motor heating.