If the Multimeter shows Discontinuity, No Sound, or Resistance Value more than 100 M Ohm, The motor winding Insulation is in good health. If it reads "ER", this means that the power feed has been reversed, which causes the motor to turn in the wrong direction. A three-phase motor converts electricity into mechanical energy via an alternating current provided by three leading power wires. Most of the faults in an electrical motor can be rectified by a Suitable testing procedure. It will usually be low enough (under 30 Ω) for the audible continuity indicator to sound. Troubleshooting a faulty Three Phase motor can be a difficult task if proper Procedures are not adopted. Normally a 3 phase supply is mentioned as R Y B. 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 advice mentioned here applies to every four-wire configuration fan motor, regardless of fan motor size. This shows that Multimeter functional and ready to test. For a three-phase motor, do the following: Measure the friction between the motor frame (body) and the earth with a multimeter. Check the appearance of the motor. Chat soon! Copyright © 2020 Electrical Talks – Powered by Customify. Make sure the power supply terminal is in good condition. Inspect the three-phase motor and look for terminals — where three wires connect to the motor — labeled L1, L2 and L3. A balanced engine should read less than 0.5 ohms. Check full load amps (FLAs) with the appropriate meter when the motor is turned on or with a full preference clamp-meter unnamed napplet FLA. Deviations from the rated FLA can test the engine. Select the Phase Rotation setting on your mutlimeter. This might result in unexpected motor failures when critical services from such motors are required affecting availability of plants. Your email address will not be published. Once you have tested a few 3-phase motors, the process will come easily. The multimeter detects the flow of electricity and determines whether it is correct, as the wrong alternating current pattern can cause the motor strator to move the wrong way and malfunction. Actually voltage or current unbalance will produce too much heat thus damaging the motors. Free and safe download. Search for burns, body damage or fan or shaft cooling. Check the compatibility of the motor winding from stage to stage (U to V, V to W, W to U) using a multimeter. Our services include web design, web development, Social media marketing, SEO & more...unique web hub. Place the test leads across the winding terminals w1 and w2 as shown in figure (b). What is Skin Effect? Know that the three steps have identical or almost identical windings. Check the three-phase motor is connected to delta or not, if so remove the links. Repeat step 3 for Winging terminals U1-U2 and V1-V2. Carefully inspect the name plate and compare the values of the running AMP test (see below) with the value of the name plate. Industries of today use three-phase motors widely in high-power applications. The reading ohms for each winding should be the same (or almost identical). The windings (all three in a three-phase motor) should read low but not zero ohms. Turn on the motor. Alexis Rohlin is a professional writer for various websites. She has produced works for Red Anvil Publishing and was one of the top 10 finalists in the 2007 Midnight Hour Short Story Contest for OnceWritten.com. The display will read "OK" if the power feed is flowing in the correct direction. Loss of insulation resistance of an electric motor is one of the first signs of motor failure. Indres Inc: Three Phase Motors Equipment Maintenance Description pages 4,5, Field Piece: Classic Style Digital Multimeter - LT16A. For phase-to-phase terminals (U to V, V to W, W to U), test the motor winding resistance or ohm reading using a multimeter or ohmmeter. Rotate the motor shaft manually to check the condition of the bearing. Save my name, email, and website in this browser for the next time I comment. Check the terminal connection bar (U, V and W). In case if Multimeter shows discontinuity or higher resistance, the Motor winding should be replaced. The trick is knowing which leads to hold on to and which wires make no difference at all. The best electrical diagram apps for Android and their features, vingepost Media Inc. (vingepostnowstarted.com) is an independent news media organization which serves its readers with news from the entertainment world online…read more click hear-vingepost, Download Mobile Games For Windows . Further problems may need to be solved. Step-by-step guide to learn how to start a blog, choose the best blogging platform and avoid the common blogging mistakes …more read click hear-blogging.nowstarted, We offer a wide range of Digital Marketing & Web Development Services. Its Pros and Cons? Terminals W2, U2, V2 are connected in STAR, While Terminal U1, V1, W1 are connected to the power supply.How to test winding of a 3 phase motor;Using a Multimeter or ohmmeter we can we can diagnose the two most common failures in a 3 phase motor:1-Shorted winding caused by the damaged insulation.2-Burnt winding caused by excessive current and heat.To check the health of the winding of a motor, we will perform a simple continuity test on motor winding. Observe the display on your multimeter. The first step would be checking the winding resistance. Error: Unsupported get request. Testing can help a technician to find out the specific part of the motor which is faulty and need to be replaced. Since the winding test is an offline test so motor must be disconnected from the power source. Remove the connection link between terminals W2, U2, and V2 for testing purposes. Until the winding is right, the phase of each phase must be continuous. Check the motor frame (earth) from phase to phase (U to E, V to E, W to E). This article will elaborate testing Procedure and a step by step guide on how to check winding of a three phase motor using a Multimeter or Ohmmeter. This condition should be immediately rectified because a Motor operating person’s body can get an electrical shock if he can in contact with the motor body. Look for easy, free rotation of the shaft. The smaller the motor, the higher this reading will be, but it should not be open. Your email address will not be published. For testing purposes, we assume that the motor is connected in a star configuration. Switch the position of two of the wires — the order doesn't matter — then reattach the mulitmeter leads to the wires. Its include Common faults,their diagnostic testing possible solution. Please read the Graph API documentation at https://developers.facebook.com/docs/graph-api. I look forward to fresh updates and will share this site with my Facebook group.