Remember that the three phases have identical windings or nearly so. Get motor rewinding procedure pdf file for free from our online library pdf file. Testers for electric motors and all kinds of windings. Threephase dualvoltage motor insulation resistance testing. Electrolyte spillage and electrical shock protection, to adopt various electrical safety requirements found in global technical regulation gtr no. Test methods for determining the impact of motor condition on. Rules for classification and construction vi additional rules. The term nrtl now applies to many laboratories operating under osha occupational safety and health. Test results of surge protection devices shall be in accordance with procedures for testing of lv surge arresters. How to check induction motor by multimeterhindi youtube.
Basic electrical tester, check the voltage at the motor terminals. It can give an accurate reading of the measure of resistance and continuity available in a highvoltage circuit and electrical motor. For single phase motor testing we apply generally three test ntinuty test 2. Jul 01, 2015 basic motor testing with multimeters and ammeters july 1, 2015 by david herres 12 comments when an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. Ac motor winding resistance test check the motor winding resistance or ohms reading using a multimeter or ohmmeter for phase to phase terminal u to v,v to w,w to u. How to test a threephase motor with a megger hunker. Maintenance tester for deenergized motors, generators and windings. Reliability life testing and evaluation of 3phase motors.
Manual or fully automatic high ease of use and very. Similar to bulk oil breaker, oil is used as the insulation medium in this breaker. To do this for delta connected 9lead motors, remove the wirenuts from 4 and 7, 5 and 8, and 6 and 9. This article discusses the financial impact of motor condition on electric motor. This prevents testing coiltocoil insulation resistance for all six coils and their combinations. Measuring motor parameters control technology corp.
The measuring procedure the measuring procedure has been based on the unece regulations 101 and within the scope requiring it to be detailed according to en 18211. Almost all electrical equipment requires planned inspection and maintenance being carrying out. Throughout germany, only a few groupindependent providers offer test services of this kind. This installation and maintenance manual has been written to assist the user with proper procedures when handling, installing, operating and maintaining the equipment. Testing of the electric vehicle in driving cycles fig. Can be combined with a dynamometer for load testing of motors. Unfortunately the formal test procedures iec6003421, standard on efficiency measurement. Designed to run the motor after rewind or servicing.
A wellplanned electric motor preventive maintenance programme is the key to dependable, longlife operation of electric motors. This might result in unexpected motor failures when critical services from such motors are required affecting availability of plants. Motor fai 1 ures electric motors have been in service for over. However, as the name implies, much lesser quantity of oil is used in this type of breaker. At a, the insulation resistance decreases due to aging and dust accumulation. Guide for the use of electric motor testing methods based on iec 6003421 p ll determined from residual loss 8. This work has now been taken over by the iea efficient electrical enduse equipment 4e electric motor systems annex emsa task c testing centres. If it is a wye connected bldc motor, the resistance is the linetoline resistance. Ieee std 1122004, ieee standard test procedure for polyphase.
Ieee std 1122004 revision of ieee std 1121996 ieee standard test procedure for polyphase induction motors and generators sponsor electric. Receiving each baldor electric motor is thoroughly tested at the factory and carefully packaged for shipment. This document contains proprietary information of general electric company, usa and is furnished to its customer solely to assist that customer in the installation, testing, operating andor maintenance of the equipment described. Like our inhouse electric motor maintenance services, leppertnutmegs onsite maintenance services focus on preventative and predictive electric motor maintenance. The term listed means controlled, monitored, and otherwise placed under formal surveillance by the approval agency or testing laboratory. The complete guide to electrical insulation testing. The sharp fall at b indicates there was an insulation fault. Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors. Nhtsa is issuing this final rule to amend federal motor vehicle safety standard fmvss no.
The windings are marked with tags u1 and u2, v1 and v2, w1 and w2. Whitelegg manufacture a large range of ac only or ac and dc test panels for electric motors. The possibility of carrying out routine testing and type tests for all motor makes at our test facility including electric motors that were not purchased from menzel will make you more flexible in the future. This ensures electrical equipment is kept in good working condition at all times. Thus divide the resistancell by 2 to get the phase resistance. This tester is capable of providing diagnostic information for all kinds of motors. Modular construction to suit the clients test requirements and budget.
Test results of motor starter equipment shall be in accordance with. To effectively test the motor, you must disconnect the field coils where possible. Inspection and test procedures for rotating machinery. Testing and commissioning procedure for electric motors eep. Testing of a threephase electric motor has to be conducted in order to get continuous services from motors without any break down or failure. Rules for classification and construction, i, part 1, chapter 3 electrical installations regulations for the performance of type tests, part 0, procedure test requirements for electrical electronic equipment, computers and peripherals, part 1.
Pdf electrical motor testing station with electromagnetic load. Isbn 07389785 ss95211 no part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. These motors run conveyor belts, pumps, fans, and many other applications. Threephase dualvoltage motor insulation resistance testing threephase dualvoltage motors are used for most daytoday operations in todays industrial plants. Electric motor efficiency under variable frequencies and loads pdf r06004. With an ohmmeter set to the resistance or ohms test setting, place test. Electric motors have had a reputation for being a mix of science and magic. Rtd circuits shall be in accordance with system design intent and machine protection device. The purpose of these guidelines is to provide standards for offline motor testing for low and medium voltage electric motors. For the earliest detection of insulation breakdown, partial discharge provides another level of high accuracy electric motor analysis over and above that achieved by the standard surge test. At c, the fault has been repaired rewinding of the motor so the insulation resistance has returned to a higher value and has remained stable over time. Figure 4typical record of insulation resistance of a mill motor. While a system with too large of motor may add too much weight, size, or cost to the system. Dot national household travel survey data mike duoba anl j1634 electric vehicle energy consumption and range test procedure cancelled oct 2002 jeff glodich mike duoba j2951 drive quality evaluation for chassis dynamometer testing jeff glodich j2711.
Maintenance tester for deenergized motors, generators and windings 8. With its 14 different test methods the allinone motoranalyzer2 offers almost. For generally testing of induction motor we perform three test ntinuity test 2. Read online now motor rewinding procedure ebook pdf at our library. On july 31, 2017, doe published a request for information the july 2017 rfi initiating a data collection process to consider whether to amend does test procedure for small electric motors and electric motors, and whether new test procedures are needed for motors beyond those subject to the existing federal test procedures. Whether your motor is powering a paper mill, textile plant, steel rolling system or other type of industrial or commercial facility, leppertnutmeg can perform an array of motor maintenance and repair services, includi. Motors are susceptible to the gradual failure of their insulation resistance. The paper also describes a detailed procedure of design. The electromagnetic load emulator ele is designed to be an adjustable load of an electric motor. The partial discharge test has become more important to evaluate insulation in electric motors within the last few years. Utility factor definitions for plugin hybrid electric vehicles using 2001 u. When a motor fails, it is often difficult to see why it failed just by looking at it. The following standards are widely used for efficiency testing of motors at manufacturers test facilities and laboratories. Jul 06, 2016 testing electric motors doesnt have to be a mystery.
Does test procedures for electric motors are prescribed at. Introduction the procedures stated in this document cover the activities in preliminary tests and inspections, functional performance tests and the commissioning of newly completed installations and existing ones after major alteration. Application note electric motor performance testing and reliability. With the motor at normal operating temperature, the vibration velocity shall not exceed 2. Hev, phev, ev test standard development and validation. The goal here is to describe the testing at a level above the physical attributes, such as temperature, pressure, force, and so on, but below the level of a final assembly inside of which the electric motor.
A system with too small of motor may not be able to perform the intended task or may not meet the life requirements. Threephase power, introduced by inventor nikoa tesla, uses a polyphase system of alternating current to supply power to large motors and motor control systems. So when a motor fails to operate it may not be obvious what the problem is. Observe the condition of the shipping container and report any damage immediately to the commercial carrier that delivered your motor. This guide provides a general overview of the regulatory framework and approval process and explores the specific manufacturing responsibilities and test procedures associated with electrical safety testing. When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. Knowing some basic methods and techniques along with having a. A motor placed in storage may or may not work, regardless of its physical appearance. It is recommended that the recommended tests be performed annually on inservice and spare motors, and at acceptance of newrefurbished motors. It is most commonly used in industrial installations with multiphase power supplies. How to test a 3phase motor is discussed in this article. The speed of an ac motor depends on the frequency of the input power and the number of poles for which the motor is wound. The wire itself is usually copper or aluminum, which is known to be a good conductor of the electric current that powers your equipment. How to test three phase ac motors learning electrical.
Megger guide to electrical insulation testing pdf instrumart. Knowledge of the basics together with powerful new test equipment vastly simplifies the job. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. Motor voltage constant ke to measure the ke of the motor, put the motor shaft in a lathe and rotate the shaft at some speed rpm such as rpm. Porcelain is used for the construction of the body and minimum oil circuit breakers have much smaller foot prints than the bulk oil breakers.
The basic steps in ascertaining the health of a threephase ac motor are given below. In the running configuration, the windings are joined with metal jumpers. With a dc motor, use a dc voltmeter to measure the. Using the megger to test a threephase motor is rather easy, though the safety hazards for this procedure are quite high. Industrial productivity training manual, 1996 annual iac directors meeting. Iec 6003421 is a welcome development and it is hoped that this guidance document can help inform the redrafting process. Motor current monitoring and analysis mcsa is a straight forward tool to diagnosing problems with large inductive motors. Check the meters operation manual if necessary choose the highest scale. Testing and commissioning procedure for electrical installation 1. Testers for electric motors and all kinds of windings schleich. The ohms reading for each winding must be the same or nearly the same.
Federal register federal motor vehicle safety standards. When you receive your motor, there are several things you should do immediately. Inspection, testing and commissioning of electrical. Motor installation and maintenance instructions gei 56128h. 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. Simple steps to electric motor maintenance r baker.
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