![]() If the motor is completely unresponsive, no ac humming or false starts, take a reading at the motor terminals. This tester is capable of providing diagnostic information for all sorts of motors. Preliminary (often definitive) tests generally take place using the ubiquitous multimeter. A hand-held multimeterĪ number of diagnostic tools – a clamp-on ammeter, temperature sensor, Megger, or oscilloscope – may help illuminate the problem. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure including insulation deterioration, or a deteriorating bearing. Another possibility is that the driven load is jammed, binding or mismatched. ![]() ![]() ![]() Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes.
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