The national electrical manufacturers association nema has developed a set of speci. Field testing and repairing can be accomplished with basic tools and repair parts which should include the following. Therefore, motor troubleshooting involves the entire system, not just the. Troubleshooting electric motors presents learners with a practical approach to troubleshooting motors and equipment in electrical systems. The third and last type of diagram is the installation diagram. Maintenance and troubleshooting of electric motors reliance electric posted 11005 motor maintenance scheduled routine care introduction the key to minimizing motor problems is scheduled routine inspection and service. This article describes ac electrical motor troubleshooting. Dec 28, 2015 jacob anderson, the nations leading shopsmith mark v headstock repair expert, shows how to check a shopsmith mark v motors with a multimeter and a capacitor.
Acdc motors installation, principle of operation, troubleshooting and repair the branch circuit represents the last step in the transfer of power from the service or source of energy to utilization devices. When troubleshooting automotive electrical systems, its important to use a logical process of deductive reasoning to solve the problem. How to do electrical troubleshooting of electrical motor. A good example is provided in the book the electrical troubleshooting pocket guide, a mcgrawhill publication, by john e. There are many different electrical motors, but this thesis and the course that was made, focus mostly on the ac induction motor. Electrical motor controls for integrated systems, the industryleading textbook, features a new open design that offers maximum fl exibility to meet your instructional needs. Other motors that are included are 1phase induction motors, permanent synchronous.
If the motor problems cant be resolved with this list, please contact your supplier for assistance. The example used is a 240v, 3phase, delta system in a relatively small industrial application, with the service equipment as shown in the accompanying diagram. Practical troubleshooting of electrical equipment and. At the end is just an example how our software uses real world workorder system to track student while doing electrical troubleshooting with our simulation software, and the detailed analysis report. How to troubleshoot a 3phase electric motor hunker. Electric motor maintenance and troubleshooting, second edition explains in detail how all types of ac and dc motors work.
This conversion is usually obtained through the generation of a magnetic field by means of a current flowing into one or more coils. Properly installed and maintained lincoln electric polyphase ac induction motors operated within the nameplate ratings will run troublefree for many years. The text that was researched and compiled contains explanations of the motor parts, theory about electromagnetism and how current is used to make an electrical motor rotate. Electric motor drive installation and troubleshooting. A quality multimeter multitester capable of reading less than one ohm and with a specific diode testing fun electrical tools including cutters, soldering iron. Take input voltage to the motor using the volt ohmmeter. Troubleshooting ecm motors for 80% two speed furnaces check low voltage at rc terminals, at the control board pins 14, 9 of fourteen pin connector should always have 24vac. Bearings in motors instore exposed to low vibrations through the ground can brinell. The nema standard mg1, section iv, part 31 provides an enhanced insulation requirement for electric motors, allowing. Subcommittee 15 electrical and electronic diagrams was formed on april 26, 1964, as a subcommittee of sectional committee yl4standards for draw ings and drafting. Essential for anyone who needs to buy, install, troubleshoot, maintain, or repair small to industrialsize electric motors, this practical guide contains new information on threephase motors along with coverage of the. Pdf troubleshooting electrical motor control circuits pdf.
The above electric motor troubleshooting chart will get you down to the specific failure cause like a capacitor or a centrifugal switch, but will not get into details like electric motor troubleshooting capacitor, its self. Refer to the wiring diagram to verify the motor is wired correctly. Electric motor maintenance and troubleshooting, 2nd edition. Pumps move the heated or cooled water to the exchangers. Check the source of power, overload, fuses, controls, etc. Electrical troubleshooting shopsmith mark v motors youtube. Heat if two dissimilar metals are joined together at one end and their junction is heated, a small amount of.
Sep 27, 2012 learning 101 basics of motors and motor controls. Electric motor maintenance and troubleshooting, 2nd. The ac induction motor is the most used electrical motor in industrial applications worldwide. This video uses electrical troubleshooting simulation software to teach you how to troubleshoot an electrical motor control circuit. Specifi c topics have been organized into sections for modular instruction.
Practical troubleshooting of electrical equipment and control circuits will help engineers and technicians to identify, prevent and fix common electrical equipment and control circuits. Motor and motor control troubleshooting techniques. The contacts are controlled by a coil in the control circuit the starting relay is only in the circuit for a short period of time the type of motor control device is determined by the. Jumping to conclusions can be expensive and time consuming. Understanding electrical schematics part 1 revised. Today it is not uncommon for some manufacturers to show both types of diagrams on their equipment. Electric motors and control systemsfrank petruzella. Dc motor troubleshooting based on the easa technote troubleshooting dc motors always disconnect the power before handling any parts of the electrical equipment lock out and tag out all electrical circuits test for voltage before touching any components. Tips for troubleshooting electric motors understanding the nuances of various motor types is essential when servicing or installing such units b y d e n n i s b u s h a fter more than 100 years of use, with an ever increasing installed base, there are probably few aspects of an electric motor s usage and failure modes. When formed, this subcommittee was charged with the responsi bility of preparing a drafting standard covering electrical schematic, wiring and.
Electric motors important questions and answers electric motors are the equipment that transforms electrical energy into the mechanical energy which further is used to drive a vehicle, plant and several other things around us. The branch circuit represents the last step in the transfer of power from the service or source of energy to utilization devices. Pdf pdf electrical motor controls for integrated systems. Troubleshooting ecm motors check high voltage at motor pins 4, 5 of five pin connector should always have high voltage 120 volts for furnaces 240 volts for fan coils tyler products. Understanding electrical schematics part 1 revised introduction. How to solve common electric motor problems and get great. Check for faulty leads, connections and transformers. Electric heating r,w1,w2 24vac 0 24vac 0 0 1speed ac, cooling r,yy2,g 0 0 24vac 12vdc 0 2speed ac, low cooling r,y1,g 0 0 24vac 0 12vdc. To achieve long motor life in wet environments, like a dairy processing plant, standard motor construction and standard water ingress protection are insufficient. Start studying unit 20 troubleshooting electrical motors. The stator is a permanent magnet, so the motor is smaller in size. Electrical troubleshooting 2 when using the multimeter to make voltage measurements it is important to remember that the voltmeter must always be connected in parallel with the load or circuit under test. Mar 29, 2019 check that the windings are not open or blown. A great guide for which motor test you need to perform, be it a large industrial 3 phase electric motor troubleshooting job you are doing or you are just troubleshooting small electric motors.
Troubleshooting electrical motors flashcards quizlet. Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the driven machinery. If not, check supply circuitry, breakers and condition of the motor s power cord. Local electrical codes should be carefully checked before final selection is made.
Describe the purpose and use of portable electrical tool testers. Gather up any background material you may have on hand and then use your senses to inspect the site. Tips for troubleshooting electric motors understanding the nuances of various motor types is essential when servicing or installing such units b y d e n n i s b u s h a fter more than 100 years of use, with an ever increasing installed base, there are probably few aspects of an electric motor s. This industryleading resource begins with electric motor principles, power requirements, and control methods and focuses on the safe operation. Were talking about linetoground faults that may damage equipment. Electric motor drive installation and troubleshooting is designed for technicians in the field responsible for installing, programming, troubleshooting, and retrofitting electric motor drives. Jacob anderson, the nations leading shopsmith mark v headstock repair expert, shows how to check a shopsmith mark v motors with a multimeter and a capacitor. Get 50% off quizlet plus through monday learn more. The frequency of routine service varies widely between applications. Open vent holes and check for a continuous stream of air from the motor. Many simple across the line singlephase and 3phase 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.
Check to make sure that all leads are well connected. Hvac essentials series electrical fundamentals course ss103 version 2. Mobile friendly too, so accessible wherever you are troubleshooting electric motors. Finds good motors as well as bad motors o eliminates no problem found at the motor shop. An electric motor is a device converting electrical energy into mechanical energy usually a torque. Cdi electronics troubleshooting guide is listed below with tips, tricks and wiring diagrams.
Troubleshooting hours saved in identifying the problem o looks at connections, cable and motor from mcc, at starter, at vfd, or at disconnect. This textworkbook provides a framework for acquiring the technical knowledge and applied skills needed by maintenance electricians and those in. Participants learn the basics of electric motors including how to maintain and troubleshoot common problems found in the workplace. It is therefore used in starter motors of cars and elevator motors p. An introduction to electric motors stmicroelectronics. Free online electric motor troubleshooting flowchart tool. Tips for troubleshooting electric motors understanding the nuances of various motor types is essential when servicing or installing such units b y d e n n i s b u s h a fter more than 100 years of use, with an ever increasing installed base, there are probably few aspects of an electric motors usage and failure modes. Troubleshooting in the field motor testing motor controller programmable logic controllers plc within the industrial troubleshooting realm today, electrical troubleshooting also requires great computer skills.
The emphasis is on practical issues that go beyond typical electrical principles, providing a toolkit of skills in solving electrical problems, ranging from. Practical troubleshooting of electrical equipment and control. Metallurgical contentmotor switchesair motorsfractional hp and general purpose motorssynchronous motors motor switches motor starting switches have been developed for a wide variation of load requirements, and special switches are available for operation in damp or dust laden atmospheres with high efficiency. Basic electrical engineering for hvac engineers a heating, ventilating and airconditioning hvac system is a simple system of heating and cooling exchangers using water or refrigerant direct expansion system as the medium.
Electric motors important questions and answers wiki. Troubleshooting in the field motor testing motor controller programmable logic controllers plc. Devices that pass power to the motor relays contactors starters. Electric motor drive installation and troubleshooting atp. Examine the motor s electrical connections and terminals. No matter how urgent the problem and motor failure can cause some very urgent problems always develop a plan of attack before you start repair work. Oct 05, 2010 at the end is just an example how our software uses realworld workorder system to track student while doing electrical troubleshooting with our simulation software, and the detailed analysis report. This course covers the operation and maintenance of ac and dc motors, including 3phase, dual voltage and multiple speed motors. At the end is just an example how our software uses realworld workorder system to track student while doing electrical troubleshooting with our simulation software, and. Unit 20 troubleshooting electrical motors flashcards quizlet. Acdc motors installation, principle of operation, troubleshooting and repair. Motor controls troubleshooting of electric motors relay. This textworkbook provides a framework for acquiring the technical knowledge and applied skills needed by maintenance electricians and those in related electrical occupations.
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