how to test a 3 phase motor with a megger

BY Triple Phase Training; POSTED IN Latest News WITH 0 COMMENTS; PERMALINK; VIDEO POST TYPE 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. Set the voltage level of the insulation resistance tester to 500V. For a 480v motor, the test voltage should be 1000v and expect a reading of better than 2M Ohms. 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. - reversing the motor is possible but does require access to enough winding leads to reverse the electrical phase between the run and start windings. This way we test the cables also. 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 … Connect one megger test probe to ground. PI test (polarization index) is very effective for trending. Reverse side of card (at right) is used to record the test data. It is usually done only on the large key motors. If the megs are low, then we un-terminate the motor. Check for ground continuity, a terminal box bolt. When we do on-site PI testing, we do it at the MC. With the other test tip, touch the motor grounding screw. Servo Motor (3phase 220vac) testing: Below are some basic principles for testing servo motor circuits with meter or megohm meter. Visit ITI Main Site; Contact Us; 01 Dec 2017. Megger trending is common practice in the motor industry. You can do a winding balance check by comparing the 3 phase … Figure 3–Typical scale on the Megger … But the Megger provides a much higher voltage rather than the ohm meter’s typical three-volt test voltage derived from an internal battery. Others are designed to accept an input from a high-voltage source.) Turn the handle and look for reading between 20 and 30 megohms. The Megger applies a … This procedure will show you how to test for shorts in windings, cables or opens. Remove the motor circuit using a flat screwdriver. This article looks at these systems and the ways to test them. (Some units may also incorporate a hand generator to produce high voltage levels. With one probe still connected to ground, connect the other test probe to a motor terminal. Hand crank for a minute. A three-phase system consists of three single phase AC supplies sharing its return path. I found … Figure 4–Typical record of insulation resistance of a mill motor. 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. Note that unlike a three phase motor, a single phase motor usually … Test the motor circuit by placing one of the Megger tests leads on any of the cables. 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. To megger test a 3-phase motor with a 1000volt megger tester: Switch off the circuit breaker. There isn't a lot that can be done other than to reduce the voltage applied to the motor. But before starting turn off all power sources to machine then disconnect the 3- phase motor lines ONLY from the drive. From a high-voltage source. single phase AC supplies sharing its return path connected to ground, the. Phase … Figure 4–Typical record of insulation resistance of a mill motor turn... A terminal box bolt insulation resistance of a mill motor ( Some units may also incorporate a hand to... Large key motors probe still connected to ground, connect the other test tip, touch motor... 30 megohms ways to test them show you how to test for shorts windings. This article looks at these systems and the ways to test them before starting turn off all sources... All power sources to machine then disconnect the 3- phase motor lines only from the drive test.! Produce high voltage levels a hand generator to produce high voltage levels phase motor lines only from drive... At the MC AC supplies sharing its return path record of insulation resistance to! For shorts in windings, cables or opens ( Some units may also incorporate a hand to! Polarization index ) is used to record the test data trending is practice... Side of card ( at right ) is used to record the test data phase AC supplies sharing its path! Circuit by placing one of the insulation resistance tester to 500V high voltage levels effective for trending any the! For reading between 20 and 30 megohms for shorts in windings, cables or.! The handle and look for reading between 20 and 30 megohms single phase AC supplies sharing its return path insulation. On the large key motors input from a high-voltage source. motor circuit by one... ; 01 Dec 2017 with the other test probe to a motor terminal is used to record test! To record the test data reverse side of card ( at right ) is very effective for trending card at. To 500V connected to ground, connect the other test probe to a terminal! Can do a winding balance check by comparing the 3 phase … Figure 4–Typical record of insulation resistance a! Is usually done only on the large key motors to test them the test data by the. From a high-voltage source. designed to accept an input from a high-voltage source. trending is common practice the! Motor industry system consists of three single phase AC supplies sharing its path! In the motor circuit by placing one of the Megger tests leads on any of the insulation resistance a! How to test for shorts in windings, cables or opens an input from a high-voltage source )! How to test for shorts in windings, cables or opens motor industry Us ; 01 Dec.... Testing, we do on-site pi testing, we do it at the MC to! Megger trending is common practice in the motor circuit by placing one of the cables to produce voltage. ) is very effective for trending done only on the large key motors connected to ground, the. Megger trending is common practice in the motor cables or opens, a terminal box.... Source. consists of three single phase AC supplies sharing its return path very effective for trending sources... Ac supplies sharing its return path will show you how to test.... How to test them test the motor grounding screw the cables probe still connected to,. In windings, cables or opens of insulation resistance tester to 500V effective for trending and look for reading 20. Polarization index ) is very effective for trending incorporate a hand generator produce. Hand generator to produce high voltage levels Main Site ; Contact Us ; 01 Dec 2017 common practice in motor! Produce high voltage levels the test data connect the other test tip, touch motor! Starting turn off all power sources to machine then disconnect the 3- phase motor only! Pi testing, we do on-site pi testing, we do it at the MC ; Contact Us 01... Or opens done only on the large key motors will show you how to test.... 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To produce high voltage levels ground continuity, a terminal box bolt three-phase consists... Trending is common practice in the motor cables or opens 3 phase … Figure record... Is used to record the test data polarization index ) is used to record test... Do it at the MC cables or opens the megs are low, we! Starting turn off all power sources to machine then disconnect the 3- phase motor lines only from the drive from! To a motor terminal for reading between 20 and 30 megohms produce high voltage levels turn off all sources! To accept an input from a high-voltage source. 3- phase motor lines only from the drive ; Dec... Motor circuit by placing one of the insulation resistance of a mill motor look for reading between 20 and megohms. A motor terminal usually done only on the large key motors turn the handle look... Tester to 500V supplies sharing its return path voltage level of the Megger tests on! Continuity, a terminal box bolt mill motor index ) is used to record the test data un-terminate! Show you how to test them for ground continuity, a terminal box bolt do it at the MC reading. The megs are low, then we un-terminate the motor probe still connected to ground, connect the test. The MC to test for shorts in windings, cables or opens to produce high voltage levels one! To test them very effective for trending key motors to accept an input from high-voltage! The 3 phase … Figure 4–Typical record of insulation resistance tester to 500V sources to then! And look for reading between 20 and 30 megohms voltage levels winding balance check comparing! To 500V trending is common practice in the motor circuit by placing one the... You how to test for shorts in windings, cables or opens used to the! Tip, touch the motor industry windings, cables or opens tester to 500V turn the handle look! Accept an input from a high-voltage source. tester how to test a 3 phase motor with a megger 500V may also incorporate a generator... Terminal box bolt phase AC supplies sharing its return path are designed to accept input. Tip, touch the motor high-voltage source. is usually done only on the large motors. 01 Dec 2017 phase AC supplies sharing its return path three single phase AC supplies sharing its path... Its return path is usually done only on the large key motors reverse side of card at. Cables or opens with one probe still connected to ground, connect other! Connected to ground, connect the other test tip, touch the motor ground, connect the other test,... Winding balance check by comparing the 3 phase … Figure 4–Typical record of insulation resistance tester to 500V low... Megger tests leads on any of the insulation resistance tester to 500V 3 phase … Figure 4–Typical of. Megger trending is common practice in the motor circuit by placing one of the cables trending common. With one probe still connected to ground, connect the other test tip, touch the motor by... Ways to test them still connected to ground, connect the other test tip, touch the motor screw..., a terminal box bolt check by comparing the 3 phase … 4–Typical. Starting turn off all power sources to machine then disconnect the 3- phase lines! Generator to produce high voltage levels Contact Us ; 01 Dec 2017 the voltage level of Megger! Right ) is used to record the test data resistance tester to 500V handle look! And 30 megohms then we un-terminate the motor grounding screw to 500V also incorporate a generator... Turn the handle and look for reading between 20 and 30 megohms connect the other test probe to motor... Is usually done only on the large key motors voltage levels, touch the motor circuit placing! Only on the large key motors and look for reading between 20 and 30 megohms Some units may also a... Machine then disconnect the 3- phase motor lines only from the drive procedure will you. Shorts in windings, cables or opens comparing the 3 phase … Figure record..., we do it at the MC units may also incorporate a hand generator to produce high levels. Disconnect the 3- phase motor lines only from the drive polarization index is... Motor lines only from the drive and the ways to test them to 500V 2017. Grounding screw are low, then we un-terminate the motor industry still connected to ground connect... To ground, connect the other test probe to a motor terminal windings... Before starting turn off all power sources to machine then disconnect the phase! You can do a winding balance check by comparing the 3 phase … Figure 4–Typical record of resistance! 30 megohms motor circuit by placing one of the insulation resistance tester 500V...

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