Electric Motor Testing Procedure

How to test an electric motor capacitor.

Electric motor testing procedure.

Testing electric motors doesn t have to be a mystery. Many electric motor failures are caused by bearing failures. This article series gives electric motor start run capacitor and hard. So when a motor fails to operate it may not be obvious what the problem is.

Home technical articles testing and commissioning procedure for electric motors scope of motor testing it should be noted that the scope of motor testing depends upon the motor type and size this being indicated on the inspection forms. For a three phase motor the isolation resistance can usually be measured between each motor winding or phase and between each motor stage and motor frame earth by an insulation tester or megger 4. The page top photo was taken of of an oil burner electric motor not an air conditioning blower fan motor or pump motor but you ll see that all of these electric motors look a lot alike. In the running configuration the windings are joined with metal jumpers.

Electric motors have had a reputation for being a mix of science and magic. A c electric motor troubleshooting guide test procedures in this article we provide a diagnostic guide to determine and repair problems with electric motors. This article gives a description of electric motor capacitor test procedures to determine if a capcitor is damaged or working normally test procedures to measure the capactor s capacitance or microfarads mfd or uf to determine if it is working within its rated capacitance range. Check c to e s to e r to e.

In order to properly test the motor you must remove. The bearings allow the shaft or rotor assembly to turn freely and smoothly in the frame. Ideally the meter should barely move off the highest resistance indication. 3 phase motor testing procedure the patriot mill turn and turnado machines are equipped with 3 phase motors.

Minimum test value of motor insulation resistance is 1 meg ohm 1 mω. The electrician or maintenance person must have this skill to determine the electrical motor condition defected or cannot use anymore it can save. Minimum test value for a good electric motor is at least 1mω running amps test with the motor running check the full load amps fla with a suitable meter or preferably a clamp on meter and compare with the motor name plate fla. And press a test probe to this spot and the other test probe to each of the motor leads one at a time.

Deviations from rated fla could signify problems with the motor under test. Knowledge of the basics together with powerful new test equipment vastly simplifies the job. Loss of insulation resistance of an electric motor is one of the first signs of motor failure. Each motor has 3 separate windings.