The instruments that perform these tests provide both low voltage and high voltage testing capabilities that look at different types of fail. This was me checking the motor windings resistence so somebody could tell me if this seemed correct or not, this is not a tutorial or instructional. It very important device to made production smoothly. Knowledge of the basics together with powerful new test. There are few, if any, serviceable parts in small electric motors, and generally its less expensive to buy a replacement rather than attempt a repair. Inspection and test procedures for rotating machinery. Dynamic braking systems use an electric motor controlled by a frequency converter as a braking. Testing and commissioning procedure for electric motors eep. If manufacturers intend to test electrical machinery on their own responsibility, apart from compliance with other requirements type testing is conditional. Ieee std 1122004, ieee standard test procedure for polyphase.
Assemble a manual motor testing station that illustrated the required components and procedures for determining power factor and efficiency. Headquartered in greenville, sc, with locations coast to coast, we offer inshop repair services, field services and distribution to over 4,000 customers working in continuous process, assetintensive industries. But smart companies understands is that what this means for maintenance programs is billions of dollars of lost revenue through increased motor repair costs, downtime, and waste in. Electric motor testing manufacturers, service companies and distributors are listed in this trusted and comprehensive vertical portal. However, if youre motor isnt working, use a multimeter to test it before deciding to replace it. 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. Insulation resistance failure of an electric motor is one of the first signs that the motor is about to fail.
However, on application electrical machinery may be type tested. How to check the amperage draw on an ac motor it still runs. The testing office will not provide any test scores by email or phone. Please continue to monitor bmcc and cuny regarding covid19 updates. 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.
Electric motor meps guide 3 what performance test method will be required. Ieee transactions on industry applications, january 1986, p. Electric motor testing electrical engineering centre. Presented by the testing office and international student services office. Building a more positive and productive workplace bmcc cuny. Students who do not pass the exam will be required to enroll in cis 100. Using the megger to test a threephase motor is rather easy, though the safety hazards for this procedure are quite high. Electric motor testing proactive predictive maintenance. Motor test for medium voltage mv and high voltage hv. 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. To ensure the electrical motor condition is good or not,we must know how to testing it. Electric motor testing deenergizedoffline motor circuit. Rtd circuits shall be in accordance with system design intent and machine protection device.
Steve, electric motor rewinding should maintain or enhance eff i c i e n c y. Electric motors have had a reputation for being a mix of science and magic. Blog tags electric motor testing emt the snell group. Its important to test industrial electric motors and generators regularly to ensure that theyre in top condition. Electric motor testing 07012011 by lemau 15 comments electrical motor is the common used in industry all over the world. A day in the life of a bmcc student who is an essential worker unlike the majority of new yorkers who have been instructed to stay home, publicfacing grocery store workers are deemed essential for society. How to check induction motor by multimeterhindi youtube. For generally testing of induction motor we perform three test ntinuity test 2. So when a motor fails to operate it may not be obvious what the problem is. Integrated power services, or ips, is the leading provider of electric motor and generator repair services in north america. This might result in unexpected motor failures when critical services from such motors are required affecting availability of plants. With a multimeter, measure the resistance between motor frame body and earth.
Like our inhouse electric motor maintenance services, leppertnutmegs onsite maintenance services focus on preventative and predictive electric motor maintenance. Selected office of industrial us department of energy. Motor electrical insulation testing the travelers indemnity company and its property casualty affiliates. Complex, powerful tools, electric motors are critical components in a wide range of equipment and. How to test a 3phase motor is discussed in this article. Lowcost portable unit, with all the major motor performance tests of the motorlab system. Determining electric motor load and efficiency department of energy. We recommend that you survey and test all motors operating over hours per year.
Standard for acceptance testing specifications for. Guide for the use of electric motor testing methods based on iec 6003421 p ll determined from residual loss 8. Integrate your electric motor testing results into the sites enterprise asset management eam reporting to further support these types of communication. For single phase motors, the expected voltage is about 230v or 208v depending whether you are using the uk or america voltage system. Specific to electric motors, motor testing evaluates static parameters like insulation, wire damage and electrical current leakage, as well as more dynamic. Jul 24, 2015 there are a lot of tests for electric motors, many dependent on the size of the motor. Students with an earned high school diploma from a united states high school or a high school school equivalency diploma obtained from the test assessing. How to test and check single phase electric motors. Developing an effective electric motor testing program. 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. Written for professionals who work in electric motors, this covers updated traction applications, the latest on solidstate motor drive controllers, electrical and mechanical parameters, specifications, shapes, performance, protection, and more.
It can give an accurate reading of the measure of resistance and continuity available in a highvoltage circuit and electrical motor. Reliability life testing and evaluation of 3phase motors. One tower square, hartford, ct 06183 the information provided in this document is intended for use as a guideline and is not intended as, nor does it constitute, legal or professional advice. Test results of motor starter equipment shall be in accordance with.
Development of accelerated reliability testing method for electric vehicle motor and battery system conference paper pdf available in sae technical papers 1 april 2014 with 2,738 reads. Using the analysis results, divide your motors into the following categories. Dec 30, 2018 testing of induction motor december 30, 2018 february 24, 2012 by electrical4u demand of energy is growing day by day and along with it cost of energy rising abruptly, so now it is necessary that the health of large motors which consumes maximum power should be taken care off. Throughout germany, only a few groupindependent providers offer test services of this kind. Ieee std 1122004 revision of ieee std 1121996 ieee standard test procedure for polyphase induction motors and generators sponsor electric. Electric motor testing is usuallly the first thing to be sacrificed when cutting back on operational expenses. How to test three phase ac motors learning electrical.
Some companies will quietly replace the whole tool with a remanufactured unit if a motor ever wears out, however, since it is difficult for them to win back customers from other brands. Testing electric motors doesnt have to be a mystery. Electric motor test systems power test dynamometer. Electric motor repair equipment whitelegg machines. How to test a threephase motor with a megger hunker. The comprehensive directory provides access to full contact and ability information for sourcing professionals, engineers and researchers wishing to get information on electric motor testing. It accurately places a controllable load on electric motors ranging from 10 through 4,500 horsepower. Other areas where communication is important are with the motor shops, motor manufacturers, the tester manufacturer and your electric motor testing knowledge provider.
Electric motor repair equipment dismantling and cleaning coil cutting, cleaning and extraction coil winding machines winding accessories impregnation and curing insulating and testing accessories for motor repair dc and high voltage coil manufacturing armature and commutator processing. Motor fai 1 ures electric motors have been in service for over. Its possible the problem could be the wring or the power source and not the electric. Already very early in the last century the iec standard 342 was established and included the summation of losses test procedure with the additional load losses assumed to be 0. Knowledge of the basics together with powerful new test equipment vastly simplifies the job. Information sharing through newsletters, tips, white papers, and online forums. Tests results are provided graphically and tabulated. Pdf development of accelerated reliability testing method. An electric motor testing class that addresses your emt certification needs. An ac motor uses alternating current to power it, and ac current changes directional flow 50 times a second.
For a three phase motor, insulation resistance is usually measured between each motor winding or phase and between each motor phase and motor frame earth using an insulation tester or megger. How to check an electric motor if it is bad hunker. When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. This tutorial will introduce the user to the fundamental electrical and mechanical principles of ac electric induction motor design and application. Sometimes the trouble lies within the power supply. A motor placed in storage may or may not work, regardless of its physical appearance.
These tests evaluate the integrity of the motor to run in the environment that it is installed. Rules for classification and construction vi additional rules. Early detection of insulation failure in electric motors cdc. Taking an electric motor testing training will qualify the technician to gather and interpret data, which will bring a greater return on investment in your motor program. It is most commonly used in industrial installations with multiphase power supplies. The primary objective of the energized electric motor testing class is to equip trainees with the knowledge and procedures needed to determine the condition of electric motors using deenergizedoffline motor testing tools and techniques.
Subject to the rules for classification and construction of gl electrical machinery is not required to be type tested. When a motor fails, it is often difficult to see why it failed just by looking at it. Three electrical windings on the outer part of the motor enable the central rotor to turn, otherwise they would simply vibrate moving backwards and forwards as the current alters direction. Assemble a computerassisted motor testing station to. The alternating current ac electric induction motor has been an industry workhorse for electromechanical conversion for over 100 years. The office of instructional testing at bmcc supports the college community by. Electric motor testing explained the electricity forum. Test results of surge protection devices shall be in accordance with procedures for testing of lv surge arresters. Jul 17, 2017 the brushes on some brush type motors may not be replaceable and the tool may need to be discarded. Electrical engineer, pittsburgh research center, u. Motor power switching is done automatically by the system. 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.911 790 1285 61 1193 264 218 60 340 460 292 1140 1352 1516 296 531 671 625 635 1144 62 1276 1125 1389 104 849 911 278 1176 1278 121 680 1501 1249 1093 1077 1353 383 14 990 1325 381 672 1098 1324 45 638 535 1495 492