If the motor is grounded, the megohmmeter & ohmmeter will solve your issue when you ohm a motor but if the motor problem is not a ground issue, you are going to need to use another tool or instrument to troubleshoot the problem since the motor maybe still operational but having issues such as tripping the VFD or circuit breaker, overheating, or underperforming, etc. ![]() Instruments such as megohmmeters and ohmmeters will detect direct ground faults but will not indicate if the insulation is failing, turn to turn faults, phase unbalance, rotor issues, etc. These issues may be the cause of wear or other defects in a wound rotor motor. Winding resistance measurements detect problems in motors that other tests may not find. Testing windings on a 3 phase motor is very easy with Motor Circuit Analysis™ (MCA™). Winding resistance measurements detect various faults in motors, generators, and transformers: shorted & open turns, loose connections, and broken conductors & resistive connections problems. We cover Groundwall Insulation testing, how to test your windings for connection issues including open & shorts. ![]() ![]() For a quick review on this topic, please click this link.
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