Many digital meters do not offer the ability to zero, so skip the "zeroing" information above if yours is a digital meter.X Expert Source Duston MaynesĪutomotive Repair Specialist Expert Interview. At C, the insulation resistance value after the motor has been rewound. At B, the sharp drop indicates an insulation failure. It depends on the type of motor you're testing, but most motors will have little resistance. Example of the variation of insulation resistance over a period of years: At A, the effect of aging and dust accumulation is shown by decreasing values.Occasionally, values as low as several hundred thousand ohms (500,000 or so), *may* be acceptable, but a higher number is more desirable. It may move a fair amount, but the meter should always indicate a resistance value in the millions of ohms (or "megohms").Make sure your hands are not touching the metal probe tips, as doing so will cause the reading to be inaccurate. Ideally, the meter should barely move off the highest resistance indication. Locate a ground screw (often a green, hex head type) or any metal part of the frame (scrape away paint if needed to make good contact with metal) and press a test probe to this spot and the other test probe to each of the motor leads, one at a time.
#Motor winding resistance values pdf manual
(Check the meter's operation manual if necessary) Choose the highest scale (R X 1000 or similar) and zero the meter by touching both probes against each other. With an ohmmeter set to the Resistance or Ohms test setting, place test probes into the appropriate jacks, usually the "Common" and "Ohms" jacks. Use an ohmmeter to check resistance value. This article has been viewed 1,219,480 times. This article received 12 testimonials and 89% of readers who voted found it helpful, earning it our reader-approved status.
WikiHow marks an article as reader-approved once it receives enough positive feedback.
#Motor winding resistance values pdf how to
3-Phase AC motor with an How to measure insulation.
There are 12 references cited in this article, which can be found at the bottom of the page. Resistance Values3 Phase Induction Motor Definition And Working PrincipleHow to check the Windings of a. RepairSmith offers in-home services to provide car owners convenient and complete auto repair everywhere. RepairSmith was also included in Built in LA’s 50 Startups to Watch and The Business Intelligence Group’s 52 Names Leading the Way in Customer Service. RepairSmith received The 2020 Big Innovation Award by Business Intelligence Group and The Startup of the Year by the American Business Awards. Duston holds an Associate’s degree in Automotive/Diesel Technology from The Universal Technical Institute of Arizona and is a Certified Diagnostic Technician and Automobile Mechanics Technician through BMW STEP. Duston specializes in leading a team that handles a variety of automotive repairs including replacing spark plugs, front and rear brake pads, fuel pumps, car batteries, alternators, timing belts, and starter motors. Duston Maynes is an Automotive Repair Specialist at RepairSmith.
This article was co-authored by Duston Maynes.