You are watching: How to meg a 3 phase motor

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The an easy steps in ascertaining the health and wellness of a three-phase AC engine are offered below:(a) basic Inspections(b) planet Continuity and Resistance Test(c) strength Supply Test(d) AC motor Winding continuous Test(e) AC motor Winding Resistance Test(f) Insulation Resistance Test(g) running Amps Test
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General Inspections
For the three-phase motor, do the following:(1) examine the appearance of the motor. Inspect for burnt, damages to human body or cooling fan or shaft.(2) Manually rotate motor pillar to study bearing condition. Look out for smooth and free shaft rotation. If tower rotation is cost-free and smooth, bearing is possibly in an excellent condition, otherwise take into consideration replacing, repair or bring out further diagnosis.(3) similar to all testing and also inspections, the motor name plate provides an important information the will help to ascertain the true wellness of the motor. Study the name plate thoroughly and also compare worths of to run amps test (see below) v name bowl valueEarth Continuity and Resistance TestWith a multimeter, measure up the resistance in between motor framework (body) and earth. A an excellent motor have to read less than 0.5 ohms. Any value greater 0.5 ohms show trouble through the motor. Further troubleshooting perhaps requiredPower it is provided TestFor three phase motors, the intended voltage for a 230/400V device is 230V step to neutral and 400V in between each of the three phase supply lines. Inspect that the correct voltage is applied to the motor utilizing a multimeter. Certain the terminal for strength supply is in good condition. Check the link bar because that terminal (U, V, and W). For three phase motors, connection type is one of two people Star (Y) or DeltaAC motor Winding continuity TestUsing a multimeter, inspect the continuous of motor winding from phase to step ( U to V, V to W , W to U ).Each phase to step must have actually a continuous if winding is OK. If any specific phase fails the continually test, her motor is most likely burnt.Please see how to recognize three step windings for suitable winding identification. U, V, W is a europe winding designation.AC motor Winding Resistance TestCheck the motor winding resistance or ohms analysis using a multimeter or ohmmeter because that phase to step terminal ( U come V,V come W ,W to U ).The ohms analysis for every winding should be the very same (or almost the same). Remember the the 3 phases have actually identical windings or nearly so!Insulation Resistance TestInsulation resistance fail of an electric motor is just one of the very first signs that the engine is around to fail. Because that a 3 phase motor, insulation resistance is normally measured in between each engine winding or phase and between each motor phase and motor framework (earth) using an insulation tester or megger. Collection the voltage setup of the insulation resistance tester to 500V. Examine from phase to step (U to V, V come W, W come U). Examine from step to motor frame (earth) (U come E, V come E , W come E ). Minimum test value of engine insulation resistance is 1 Meg Ohm (1 MΩ).

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See exactly how to measure up insulation resistance of electric MotorRunning Amps Test
With the motor running, inspect the full load amps (FLA) v a suitable meter or preferably a clamp on meter and compare v the name plate FLA. Deviations native rated FLA could signify problems with the motor under test.