Handbook of major appliance troubleshooting and repair practical electric motor. If your dryer is overheating, it may be time to look in to some electric dryer repair. At that time, the department will make a decision to repair or replace the motor. The first step before beginning any inspection or repair job is to turn the current off at the switch box and padlock the switch in the off position. Read our best advice for handling electrical repairs in your home and how to hire a professional you can trust. See the motor nameplate for proper connection diagrams. The ball bearings used in the compumotorsupplied motors.
Troubleshooting of ac and dc motors and controllersrobert. Bad contact of the starting resistance for the woundrotor motor. Download file pdf electric motor troubleshooting guide. Book description a fully uptodate, handson guide to electric motors. The actuator comes equipped with an automatic clutching system. It should be less than the full load rating stamped on the nameplate. Check for voltage at the pump motor or pump controls. He owned an electric motor repair shop for a number of years, and he taught the electric motor repair course at southwestern technical institute. Threephase motors are normally used in commercialtype operations. Turntoturn short if the motor keeps running with stator faults, a high current will.
Rate of failure varies from one application to another. Statorrelated failures account for a large portion of all electrical problems on ac motors. Local electrical codes should be carefully checked before final selection is made. This will prevent minor problems from developing into more serious problems. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. If no voltage is found, check for voltage at the electric panel. Disconnect the two wires leading from the switch to the motor and connect these to the leads of the voltmeter and with the meter set to the rx 1 scale, turn the switch on and then off. Motor capacitors store electrical energy for the motor to use.
Troubleshooting problems on your ac motor is relatively straightforward, and providing you have reasonable doityourself abilities, repairing it is not too difficult. Reducing electrical noise for detailed information on reducing electrical noise in your system, refer to the current compumotor catalog. Repair the contacts of the rheostat, or exchange the rheostat. When electric motor problems are detected early, operational conditions can sometimes be altered to return the machines to an efficient state and prevent further damage. Remove the load from the motor and inspect the amp draw of the motor unloaded. Jul 06, 2011 a fully uptodate, handson guide to electric motors.
If you use a large gasoline engine on a boat, then getting it to work at minimum speed to achieve the required trolling speed of 35 km h is not so easy. The higher the capacitance of the capacitor the more energy it can store. 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. Jul 21, 2017 check the motor power switch functioning. Electric motor repair rosenberg, robert, hand, august on. Download pdf of electric motor maintenance and troubleshooting second edition by. Predictive maintenance, motor troubleshooting and diagnostic testing. The program also describes how to use certain electrical testing equipment. If the motor does not run, the machine or device will not function. When your operations are down due to an electrical failure, well be there to troubleshoot and get you back to business. Consult your computer or terminal emulator user manual.
Augie hand had 30 years of handson experience in repairing and troubleshooting motors, followed by 15 years of giving seminars on the subject for electric motor repair shop technicians and inhouse training for large industry maintenance technicians. A dryer that is too hot can not only cause problems with your clot. For these hours to appear on your certificate, you must. Essential for anyone who needs to buy, install, troubleshoot, maintain, or repair small to industrialsize electric. Disconnect the motor from the load and run it without a load connected. Participants learn the basics of electric motors including how to maintain and troubleshoot common problems found in the workplace. You should inspect all mechanical parts of the motor. Power cordplug temporarily connects an appliance or an equipment to the mains electricity supply via wall socket or an extension cord. Electric motor maintenance and troubleshooting pdf. This course covers the operation and maintenance of ac and dc motors, including 3phase, dual voltage and multiple speed motors. 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.
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. The modules listed in the overview are linked to the corresponding pages. Some standard lincoln electric motors are also capable of pws, yds or both as indicated in the following chart. Failures in threephase stator windings, rewind scenarios when a motor fails. If power is on to the building, check fuse or circuit breaker serving the electric motor that wont run.
Students will learn how to diagnose and repair common electrical problems. If your home doesnt connect to a sewer, theres a chance youll encounter a septic system problem at some point during your life there. This article describes ac electrical motor troubleshooting. Operators must understand failure modes and potential for. Using a nut driver of proper size, remove the four 4 nuts and remove the long bolts. Verify that the motor is getting enough air for proper cooling. About this book a fully uptodate, handson guide to electric motors keep electric motors. The importance and scope of the electric motor in modern life is attested to by the fact that electric motors, numbering countless millions in total, convert more energy than do all our passenger. Avoid damage and injury when cutting blind into a wall. Well work through some very basic troubleshooting techniques and wo. These hybrid vehicles include the honda insight, honda civic hybrid, and toyota prius. When repairing an electric motor,is it necessary to know the number of.
Electric motor maintenance and troubleshooting by augie hand. Find the breakage with the multimeter and reconnect it. Electric motor maintenance and troubleshooting, 2nd edition. For each motor application, factors such as driven load. Inspect stator for defects, or loose or cut wires that may cause it to go to. The electric motor is, of course, the very heart of any machine it drives. Have your badge scanned at the door attend 90% of this presentation fill out the online evaluation for this session. All motors are suitable for full voltage or acrosstheline start.
Electrical services troubleshooting, repairs, preventive. Electric motor repair, model repair specifications for low voltage motors, and motor repair tech brief were produced by the u. Electric motor system diagnostics electric motor system diagnostics richard scott alltest pro, llc this session is eligible for 1 contact hour. Understanding how your home is wired can help you when it comes time to making minor repairs or planning a renovation project. The cost of maintaining electrical motors can be a significant amount in the budget item of manufacturing and mining industries. The motor drives the ball screw in a forward and backward motion to drive the slide room in and out. Ac motors represent industrys workhorse in all applications.
Here are stepbystep instructions for how to troubleshoot and repair it yourself. How to troubleshoot an electric motor capacitor problem. Nov 12, 2016 electric motor maintenance and troubleshooting, second edition explains in detail how all types of ac and dc motors work. Motor maintenance drive maintenance troubleshooting problem isolation you should inspect all mechanical parts of the motor regularly to ensure that no bolts or couplings have become loose during normal operation. Cars and other products with electric motors are becoming increasingly popular, and thats not necessarily a bad thing. Watersnake electric motor for the boat an indispensable tool of modern anglers like fishing or trolling on the track, and at casting. Apr 24, 2017 a bad motor capacitor may cause starting problems or could shut off the motor while running. Gasoline electric hybrid vehicles that are not powered primarily by an electric motor are not qualified electric vehicles. Both mechanical and electrical test equipment and tools are discussed with detailed.
Upon approaching 70% of the cost of a new motor, the department should be advised by the vendor. Check for local reset button on the motor popped out off see step 3 below. If we got flipped 10,000 times, we might have issues too. He owned and operated an electric motor repair shop for 15 years and. A damaged or burnt out capacitor may hold only a fraction of the energy needed for the motor if its capacitance is low. 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. For maximum effectiveness, this manual should be used as a supplement to any ongoing onthejob training in the ima electrical repair shop. Thermal switches may have a manual reset or automatic reset. Ability to troubleshoot ac motor problems and repair replace acdc motors both electrical and mechanically ability to perform both electrical and mechanical pms, which may include, dc motor brush replacement, lube system maintenance, loom pms, plant lighting, etc. A properly operating motor may be hot to the touch. Troubleshooting the problems 1, 2 as mentioned above, open the motor to find out the breakage and weld it. This course gives you a thorough understanding of electrical motor s protection, control and maintenance and gives you the tools to maintain and troubleshoot electrical motors. Electric motor troubleshooting industrial motor training.
In this video we will present you with the full repair process of an electric motor including. Be sure required safety guards are in place before starting equipment. Electric dryer repair is never any fun, but it can be necessary from time to time. Department of energys office of industrial technologies oit with input from trade associations, consulting companies, manufacturers, nonprofit corporations, and others. Using the same tools, put one 1 punch mark on the stator and end bell in line with step 1 but on the other end of motor and within i of each other. A noisy dryer is not only a nuisance, but can signal a larger problem.
These motors have fewer parts and are more sturdily built than their singlephase counterparts. Most stator faults are caused by insulation breakdown which leads to winding failure. The meter should jump from 0 ohms in the off position to high ohms in the on position. Electric fireplaces provide cozy ambience to your small room while emitting warmth. Contrary to what you may be thinking just n o w, your last name doesnt have to be edison in order to p r operly service the motors shown in the following pages.
This pocket manual is designed for one purpose to make it simple for you to install, maintain and troubleshoot century pool and spa motors. An icon used to represent a menu that can be toggled by interacting with this icon. Home electric motor troubleshooting and repair pdf electric motor troubleshooting and repair pdf. They offer drivers plenty of advantages compared to traditional engines, ranging from saving money to requiring minimal. Model repair specifications for low voltage induction motors. The frequency of routine service varies widely between applications. These portable heating devices come in various styles with authenticlooking details like realistic flames and mantels. Electric motor maintenance and troubleshooting, 2nd. Lubricate the bearings only when scheduled or if they are noisy or running hot. Always keep hands and clothing away from moving parts. Electric motors troubleshooting and understanding w tpc.
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. Electric motor maintenance and troubleshooting, second edition explains in detail how all types of ac and dc motors work. The motor troubleshooting learning system 85mt2e, used in conjunction with basic electrical machines, covers ac and dc motors troubleshooting and testing using a multimeter and a megger meter. Handbook of electric motors use and repair, john e. Lubbock electric has a highly skilled team of texas state licensed master and journeyman electricians who are oncall 24 hours a day, 7 days a week. How to troubleshoot a 3phase electric motor hunker. The only userserviceable parts on an ac motor are the brushes and the bearings. If you can diagnose the problem, you may save on repairs and kn. Disconnect power to the motor before performing service or maintenance. This course gives you a thorough understanding of electrical motors working, maintenance and failure modes and gives you the tools to maintain and troubleshoot electrical motors.
As a result these motors are less prone to malfunctions and tend to operate. The skills and knowledge covered by this system will prove invaluable for industrial maintenance technicians or anyone working in a field that uses ac andor dc motors. This webinar is all about electric motors and how to get a better understanding of them. Text headings in each module are linked to and f\ rom the table of contents for that module. The course teaches students to identify motor malfunctions by recognizing problematic symptoms and applying proven methods in correcting these problems. Jan 10, 2005 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. Troubleshooting and repairing electric water heaters dengarden home and garden. It is no exaggeration to suggest that more than half of the energy consumed worldwide is converted by ac motors into work and these are controlled by drives. This electric motor repair shop procedures manual is for use by ima personnel engaged in electric motor repair. I like getting my hands dirty with diy home projects, they are a lot of fun. Learn electrical safety in the home including proper electrical grounding, blown fuses and other safety tips. Heres everything a homeowner should know about electricity. Electrical troubleshooting summarizes and explains the basic procedures used to troubleshoot electrical circuits and components utilized in the home and industry.
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