Troubleshooting electric motors is a textworkbook that includes information and procedures for troubleshooting motors and motor circuits commonly used in industrial applications. A pwm waveform creates insulation problems for standard electric motors because the leading edge of each pwm pulse begins with a voltage spike. Electric motor maintenance and troubleshooting, 2nd. Additionally, this document imparts guidance and understanding on the selection, specification, and operation of electric motors. It includes all aspects of troubleshooting, from locating the problem using test instruments to selecting the correct motor for replacement. Failure of this pump will result in the loss of a generator currently producing half of the stations power output. Troubleshooting electric motors 5th edition by glen a. Many electric motor failures are caused by bearing failures. Franklin electric submersible motors are a waterlubricated design. Electric motors are a source of electrical hazards and consequently their. Click download or read online button to get electric motors and drives book now. Electric motors are an essential part of our daily life as many systems, applications, and services depend on them.
Low voltage ac motors for line and converter operation. Gather up any background material you may have on hand and then use your senses to inspect the site. When a motor fails, it is often difficult to see why it failed just by looking at it. Troubleshooting problems on your ac motor is relatively straightforward, and providing you have reasonable doityourself abilities, repairing it is not too difficult. 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. If a sleeve bearing fails in a small, fractional horsepower motor, the motor is. Ill include with troubleshooting method,technical guide,failure symptom and troubleshooting chart for single phase and three phase motor. Electric motor troubleshooting learning system techlabs. Induction motors were invented by nikola tesla in 1888 while he was a college student. Always keep hands and clothing away from moving parts. Electrical troubleshooting shopsmith mark v motors jacob anderson. Stator is shorted or went to ground motor will make a humming noise and the circuit breaker or fuse will trip check for leaks through the coils.
A motor placed in storage may or may not work, regardless of its physical appearance. This pocket manual is designed for one purpose to make it simple for you to install, maintain and troubleshoot century pool and spa motors. Within the industrial troubleshooting realm today, electrical troubleshooting also requires great computer skills. This article is best viewed as a starting point for motor troubleshooting. Troubleshooting electric motors with cd 4th edition. Small dc motors are used in cordless tools, small toys and disk computer drives, however, bigger dc motors are still used in some industrial applications. 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. Participants learn the basics of electric motors including how to maintain and troubleshoot common problems found in the workplace. 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. Motor will make a humming noise and the circuit breaker or fuse will trip. Operators are complaining that a large compressor on several occasions has failed to start. I will discuss further about troubleshooting guide for electric motors in my next part 2 of troubleshooting electric motors.
Participants learn the basics of electric motors including how to maintain and troubleshoot common problems found in. The fill solution consists of a mixture of deionized water and propylene glycol a nontoxic antifreeze. Troubleshooting with insulation resistance test instruments. It is by no means complete, though much of the material comes from the motor mastery university. Causes and failures classification of industrial electric. Disconnect power to the motor before performing service or maintenance. Some standard lincoln electric motors are also capable of pws, yds or both as. How to do electrical troubleshooting of electrical motor. Electric motor diagnostic guide electric motor troubleshooting guide diagnostic table how to troubleshoot and fix electric motors table a. This textworkbook provides a framework for acquiring the technical knowledge and applied skills needed by maintenance electricians and those in. Polyphase ac induction motor troubleshooting guide.
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 in the field motor testing motor controller programmable logic controllers plc. Post a question or comment about how to troubleshoot electric motors such as. Electric motor maintenance and troubleshooting, second edition explains in detail how all types of ac and dc motors work. 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. A fully uptodate, handson guide to electric motors. Introduction to electric motor system diagnostics the reliability and energy consumption of electric motors and the systems they drive has a direct financial impact to industrial and commercial enterprises we will discuss the financial justification for a motor testing program, a general discussion of deenergized and energized. The modern electric motor installation the individual motor drive has practically replaced all other types. Industrial electrical troubleshooting electric motors. Unit 20 troubleshooting electrical motors flashcards quizlet. This site is like a library, use search box in the widget to get ebook that you want. The motor troubleshoong learning system 85mt2e, used in conjuncon with. Fuse or circuit breaker is tripped replace the fuse or reset the breaker.
It is widely accepted that the most commonly used drivers for pumps are electric motors. Knowing the cause of failure in electric motors is a very important element of the industrial energy management. It is comparatively easy to obtain the required speed through the use of motors directly connected to the driven machine, through speed reducers, or the now more economical geared motors, or even through vbelt or chain or sprocket drive. Troubleshooting electric motors presents learners with a practical approach to troubleshooting motors and equipment in electrical systems. The above electric motor troubleshooting chart will get you down to the specific failure cause like a capacitor or a. Electric motor troubleshooting flowchart koldwater.
Basic electrical troubleshooting a boiler feed pump being powered by two 3500 hp inducti on motors appears to be developing a problem. Unit 20 troubleshooting electric motors flashcards quizlet. The keys to successful motor operation include a total understanding of the application, then choosing the proper type of motor for the application. Be sure required safety guards are in place before starting.
Basic electrical troubleshooting a leader in electric. The bearings allow the shaft or rotor assembly to turn freely and smoothly in the frame. Bearings are located at both ends of the motor which are sometimes called bell housings or end bells. Maintenance and troubleshooting of electric motors esr motor. Electric motor systems consume 20% of all energy generated in the united states, 57% of all electrical energy, and 70% of electrical energy consumed by industry. Insulation spot test an insulation spot test is an insulation resistance test that can be used to verify the condition of the. Motor and motor control troubleshooting techniques. Motor controls troubleshooting of electric motors relay. Start studying unit 20 troubleshooting electrical motors. 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. Backed by 150 years of experience, simotics motors are unrivaled when it comes to reliability, ruggedness, compactness, efficiency, and performance.
Some standard lincoln electric motors are also capable of pws, yds or both as indicated in the following chart. Electrical troubleshooting shopsmith mark v motors youtube. Common causes for electric motor failure motor failure. Post a question or comment about how to troubleshoot electric motors such as air conditioning compressor motors, heating equipment burner or fan motors, swimming pool. This article describes ac electrical motor troubleshooting. A laptop computer with plc programming, communication, and operating programs are a necessary tool in todays modern plant. Electric motors and drives download ebook pdf, epub. Save up to 80% by choosing the etextbook option for isbn. This course covers the operation and maintenance of ac and dc motors, including 3phase, dual voltage and multiple speed motors. Motor controls troubleshooting of electric motors free download as powerpoint presentation. The frequency of routine service varies widely between applications. Electric motor maintenance and troubleshooting, 2nd edition kindle edition by hand, augie. Excessive grease and oil creates dirt and can damage bearings. All ecm motors slight cogging or rocking is inherent to all ecm motors motor is finding its location between stator and rotor and is determining rotation rumbling sound during startup and shutdown system mechanical resonance approx 300400rpm, three.
Handson and lecture the participant is able to learnbydoing in the course. Ac motors are mainly used for industrial applications such as centrifugal pumps, fans, compressors etc. Singlephase motors are found in a long and diverse list of devices like washing machines, mechanical clocks and generators. Simotics industrial electric motors provide you with the optimum solution for every application. See the motor nameplate for proper connection diagrams. Motors today have a long service life and require a minimum level of maintenance to make sure that they perform efficiently. Electric motors, gearmotors and drives site search sub motor troubleshooting chart caution. These tests include an insulation spot test, a dielectric absorption test, and an insulation step voltage test. An indepth troubleshooting guide to help you with your ac electric motor issues.
For additional information that could prove useful, check with motor manufacturers. Use features like bookmarks, note taking and highlighting while reading electric motor maintenance and troubleshooting, 2nd edition. Three phase induction motors are one of the most popular electric motors commonly found in processing plants or any manufacturing concern. Learn vocabulary, terms, and more with flashcards, games, and other study tools. All motors are suitable for full voltage or acrosstheline start. This troubleshooting guide can also be applied to other types of three phase. Download it once and read it on your kindle device, pc, phones or tablets.