Why should winding heaters be kept on?

Winding heaters are designed to maintain a certain temperature within the motor windings, which is crucial for preventing condensation. When a motor is idle, particularly in humid environments, moisture can accumulate within the windings. This moisture can lead to insulation deterioration, ultimately causing electrical failures or short circuits. By keeping the winding heaters on, the temperature of the windings is raised above the dew point, effectively preventing any moisture from condensing. This practice helps maintain the integrity of the insulation material and extends the overall life and reliability of the motor.

The other options touch on important aspects of motor and pump performance but do not directly relate to the primary purpose of winding heaters. For instance, while improving pump efficiency and prolonging bearing life are significant considerations, they are not the main objectives of maintaining heat in the windings. Additionally, while supporting pump motors is essential, it does not address the specific role of winding heaters in moisture control.