A common reaction to an overloaded motor that repeatedly trips its protection unit (or burns open its “heaters”) is to “upgrade” the protection. ... Causes may include a large change in load (e.g., a scrap grinder is fed too much at a time), misalignment, a broken drive gear, or improper motor drive settings.

How do you fix a motor overload problem?

Check the motor starter contactor, the fuses, and the overload relay. 4) Rectify the root cause of overload and reset the overloads by push the reset button. Start the motor and check the running motor amps and compare to rated FLA and overload heater size using a clamp-on ammeter.

What causes a motor to trip on overcurrent?

Electrical overload or over-current is caused by an excessive current flow within the motor windings, exceeding the design current which the motor is able to carry efficiently and safely. This can be caused by a low supply voltage, resulting in the motor drawing in more current in an attempt to maintain its torque.