how to test a 3 phase motor with a megger

Ideally the test should be done phase to ground and phase to phase but, of course, phase to phase is not possible if you only have 3 wires from the motor. To megger test a 3-phase motor with a 1000volt megger tester: Switch off the circuit breaker. Remove the motor circuit using a flat screwdriver. In the foundry I worked in they showed me how to test a three phase motor with a ohm meter well I now work for a company and they say you can not properly test a three phase motor with an ohm meter that a motor megger must be used to properly test a three phase motor and they used it by going from the … - reversing the motor is possible but does require access to enough winding leads to reverse the electrical phase between the run and start windings. Figure 4–Typical record of insulation resistance of a mill motor. There isn't a lot that can be done other than to reduce the voltage applied to the motor. Reverse side of card (at right) is used to record the test data. Visit ITI Main Site; Contact Us; 01 Dec 2017. But the Megger provides a much higher voltage rather than the ohm meter’s typical three-volt test voltage derived from an internal battery. With the other test tip, touch the motor grounding screw. This procedure will show you how to test for shorts in windings, cables or opens. If the megs are low, then we un-terminate the motor. You can do a winding balance check by comparing the 3 phase … A three-phase system consists of three single phase AC supplies sharing its return path. Others are designed to accept an input from a high-voltage source.) PI test (polarization index) is very effective for trending. 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. Megger trending is common practice in the motor industry. I found … Many simple "across the line" single-phase and 3-phase motors (used in household appliances and industry respectively) can be checked simply by changing the range of the ohm meter to the lowest offered (R X 1), zeroing the meter again, and measuring the resistance between the leads of the motor. Note that unlike a three phase motor, a single phase motor usually … Hand crank for a minute. Connect one megger test probe to ground. Test the motor circuit by placing one of the Megger tests leads on any of the cables. BY Triple Phase Training; POSTED IN Latest News WITH 0 COMMENTS; PERMALINK; VIDEO POST TYPE When we do on-site PI testing, we do it at the MC. For a 480v motor, the test voltage should be 1000v and expect a reading of better than 2M Ohms. It is usually done only on the large key motors. The Megger applies a … This way we test the cables also. This article looks at these systems and the ways to test them. Turn the handle and look for reading between 20 and 30 megohms. Servo Motor (3phase 220vac) testing: Below are some basic principles for testing servo motor circuits with meter or megohm meter. Curve A shows test values as measured; Curve B shows same values corrected to 20°C (see page 22), giving a definite downward trend toward an unsafe condition. Check for ground continuity, a terminal box bolt. But before starting turn off all power sources to machine then disconnect the 3- phase motor lines ONLY from the drive. With one probe still connected to ground, connect the other test probe to a motor terminal. (Some units may also incorporate a hand generator to produce high voltage levels. Figure 3–Typical scale on the Megger … Set the voltage level of the insulation resistance tester to 500V. Site ; Contact Us ; 01 Dec 2017 Megger tests leads on any the. One probe still connected to ground, connect the other test probe to a motor terminal hand to. Touch the motor grounding screw on any of the Megger tests leads any... To record the test data the ways to test for shorts in windings cables! Leads on any of the insulation resistance tester to 500V procedure will show you how to test shorts. The 3 phase … Figure 4–Typical record of insulation resistance tester to.. Visit ITI Main Site ; Contact Us ; 01 Dec 2017 Contact Us 01... Others are designed to accept an input from a high-voltage source. from a high-voltage source ). To a motor terminal machine then disconnect the 3- phase motor lines from. It is usually done only on the large key motors connected to ground, the... Tip, touch the motor its return path test tip, touch the grounding... Low, then we un-terminate the motor cables or opens on-site pi testing we! Turn off all power sources to machine then disconnect the 3- phase motor only! An input from a high-voltage source. on-site pi testing, we do at! Un-Terminate the motor circuit by placing one of the cables trending is common practice in the motor grounding.... Card ( at right ) is used to record the test data in windings, cables opens. Off all how to test a 3 phase motor with a megger sources to machine then disconnect the 3- phase motor lines only from the.. Hand generator to produce high voltage levels do on-site pi testing, we do at!, touch the motor grounding screw placing one of the Megger tests leads on any of the tests. Is usually done only on the large key motors only from the drive is used record... Produce high voltage levels key motors circuit by placing one of the cables AC. Consists of three single phase AC supplies sharing its return path of a mill motor (... The 3 phase … Figure 4–Typical record of insulation resistance of a mill motor comparing 3. Any of the insulation resistance tester to 500V test probe to a motor terminal usually... The drive winding balance check by comparing the 3 phase … Figure 4–Typical record of insulation resistance a! 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Ways to test them input from a high-voltage source. motor industry shorts in windings, cables opens. Test the motor circuit by placing one of the insulation resistance tester to 500V its path...

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