B) Call the equipment supplier and provide the system model numbers. When is the gas valve energized on an induced-draft furnace that uses hot surface ignition? Motor failure doesnt have to be a fact of life if you take this guides five key messages to heart. Electronic controls on air-conditioning systems typically report faults by: The most common cause of airflow-related problems in air-conditioning units is: If an air-conditioning system is operating with an 80F return air temperature and a 50F supply air temperature: 11). Copyright 2016-2021 Duke Electric. Using your existing staff, and scaling as necessary, you can implement without costly retrofitting and large IT infrastructure investments. , as well as help you put together your motor purchase and repair policies. a. A) Adding refrigerant increases the system subcooling. The most common mechanical faults are shaft imbalance, looseness, misalignment, and bearings. Thermographyuses infrared thermometers to detect abnormal heat patterns that may signal potential problems such as inadequate airflow, bearing problems, insulation breakdown and unbalanced voltage. Whats the shops inventory of parts and materials for repairs? It is critical to determine the best course of action should a failure occur. Use the following chart to connect the dots between electric motor problems, causes, effects (which are often invisible until the motor fails and is dismantled at a motor shop) and signs to look for that could help you take early action. Next up is advice on troubleshooting, fault testing, motor failure reporting and decision-making, including when to call in a motor shop. Instead, he recommends including these four parts, which can be further broken into subheadings according to the situation. e) all of these, When measuring the leads of a multispeed shaded pole motor, there should be measurable resistance between all the leads. Which component failure could keep the fan from operating during the heating cycle on a traditional standing pilot gas furnace? The open is usually caused by a blown fuse, an open contactor, a broken power line or bad connections. Do these five things and youll increase uptime, reliability and productivity at your plant and look like a hero to your boss. Things to look for during an inspection of your motor include: Signs of corrosion, dirt or debris on components, including fins, windings, contacts and relay, A burning smell that may indicate overheating, Signs of wear on the commutator and brush assembly, Anything unusual with the motor mount, stator, rotor and belts, Dirt buildup, inadequate lubrication and signs of wear on bearings, A bearing housing thats hot to the touch, Loose connections, including in the starter switch and fuses\. There are two kinds of soft foot: In both cases, soft foot can be caused either by an irregularity in the machine mounting feet, or in the mounting foundation upon which the feet rest. Improve Predictive Maintenance With Thermal Monitoring, Quick Start: Fluke Connect Handheld Tools, Quick Start: Fluke 1742/1746/1748 Three-Phase Power Quality Loggers, causes of electric motor winding failures, Computerized Maintenance Management System (CMMS). Fault isolation diagrams and troubleshooting tables help the technician locate problems through the process of: The refrigerant condensing temperature for an air-cooled system having a 20F split is: The most common airflow problem experienced on air-conditioning systems is: C) Low airflow caused by dirty or plugged air filters. You may have noticed that there was a big difference between the common causes of motor failure we discussed at the beginning of this guide, which were mostly component-related, and the problems identified in the troubleshooting chart, which were situational. First, go beyond naming the failed component to identifying the root cause of failures so theyre less likely to happen again. Grounded windings can be detected by measuring the resistance with a multimeter between: Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M. Soot accumulation on the heat exchanger is: What regulates the draft through the heat exchanger and prevents downdrafts from blowing into the heat exchanger on natural-draft gas furnaces? The most common types of single phase compressor motors are: Permanent split capacitor (PSC), capacitor start (CS), capacitor start/capacitor run (CSCR), and split phase, Motors with shunted field windings: But anyone in the biz knows that behind that question is a whole lot of hemming and hawing, made worse by pressure cooker environments and a lack of information. The motor and insulation tester assure safe operation, prolongs the life of electrical systems and motors. The failure rate of the winding in the induction motor was higher than that of the synchronous motor. How static motor testing can support preventative maintenance programmes. Motor winding damage Motor winding damage (all windings) is caused by the thermal deterioration of the insulation in all phases, which is caused by motor overload or over/under voltage situations. Weve come up with these. Winding Shorted Turn-to-Turn Capture and document critical measurements at installation, before and after maintenance and on a routine basis. Some motor failures will require asking fewer than five whys. This is the first installment of a five-part series on common motor failures that will go on to cover motor windings, rotor bars, external conditions, and shaft couplings. This offline testing, often called static testing, looks at insulation resistance, wire damage and current leakage. You can identify dead shorts, loose connections and open circuits in coiled windings using a digital multimeter. When is the induced draft blower energized on an induced-draft furnace that uses hot surface ignition? A winding failurewhich is often caused by a breakdown of the windings insulationwill cause a short in the motor. We've put together a post onwinding failure, with awesome photos courtesy of EASA, if you're looking for examples. These losses dissipate in the form of heat, which, over time, will deteriorate the insulation capability of the windings. Smith, Michael Abbott. Arming maintenance engineers and technicians with the right knowledge, prioritizing workload and managing preventative maintenance to monitor equipment and troubleshoot intermittent, elusive problems can, in some cases, avoid failures due to normal system operating stresses and reduce overall downtime costs. Which type of drive is used to make large changes in RPM or torque from the RPM and torque of the motor? Using a decision tree or flow chart takes the guesswork out of the repair-or-replace decision process, making it easy to defend recommendations to management. But wouldnt it be better to avoid failure in the first place? You need to consider the cost to replace, cost to repair, cost of down-time (including domino effects on the plant and company as a whole) and long-term costs, such as repairing an old motor thats an energy hog. Winding contamination cannot always be readily identified as the root cause of an insulation failure. For example, your plant may decide to repair an off-the-shelf motor if the repair costs less than 60% of a new premium high efficiency motor. It may also occur as a result of excessive starts or reversals. Windings are made from insulated metal wire, usually copper but sometimes aluminum, that are laid in coils and wound around either the rotor or the stator. This type of insulation failure is typically caused by contaminants, abrasion, vibration or voltage surge. Special rates good through June 1. To get there, you have to understand the underlying causes of motor failures. We've turned EASA's decision tree into a free online repair or replace decision-making tool to give you a repair or replace answer right away. What is the effect on suction pressure and superheat? What term expresses the ability of the motor to work beyond its rated output? Use this guide to respond quickly and confidently when any electric motor goes down, whether its a hard-to-source piece of critical equipment or an easily replaced off-the-shelf unit. Electrical insulation is classified by the ________ stability of the materials that are used for the winding. Improper lubrication, inappropriate mechanical loads, heat, contamination and shaft currents are all the usual suspects when it comes to bearing problems. You need to consider the cost to replace, cost to repair, cost of down-time (including domino effects on the plant and company as a whole) and long-term costs, such as repairing an old motor thats an energy hog. If the problem is in the centrifugal switch, thermal switch, or capacitor, the motor is usually serviced and repaired. A) Setting the thermostat below room temperature. Engage locallyEASA's international membership is divided into 10 Regions that are made up of 32 Chapters. 23% Major winding failure [8], 2011 c) Under voltage and Over voltage C) Expansion of the heat exchanger as it heats up. Ball bearings are used in smaller motors, while the big boys will have roller bearings. Thermal deterioration of the insulation in all phases of the stator winding typically is caused by load demands exceeding the rating of the motor. Document operating condition, machine specifications and performance tolerance ranges. The suction pressure on a split AC system that is running with an excessive evaporator heat load: The manufacturer's data on a split AC system indicates that the normal temperature drop should be 15F at the current operating conditions. Yes, itll require some upfront work. If the reading is infinite, your motor should be fine. Which of the following formulas can be used to calculate fan speed (RPM)? Thermal deterioration of insulation in one phase of the stator winding can result from unequal voltage between phases. If you know the basics of electric motor function, including the names of the main parts of both AC and DC motors, youll get the most out of the rest of this guide. The benefits of these maintenance software tools include: Leveraging these tools and technologies can offer key insights into the health of electric motors. Many professionals believe that a flexible coupling eliminates and compensates for misalignment, but a flexible coupling only protects the coupling from misalignment. a) contamination When an electric motor fails, theres one question that must be answered. Normally, a split AC system that uses a fixed metering device can safely operate at temperatures: The first electrical checks of a system that is not operating generally involve: C) Checking the power circuit to the equipment. Yet, monitoring the health of electric motors is not typically a priority for most organizations. Root cause failure analysis(RCFA) is a well-documented process for examining a failed motor and its system. This imbalance can lead to stresses in each of the phase circuits in a three-phase power system. Electric motors serve as a critical component for any facility. A tri-fold brochure containing the information on this page is available for purchase. The first signs of this problem will be noise and overheating as the bearings begin to lose their original shape and metal fragments mix with the grease and increase bearing friction. When ohming components on the system, it is important to: How is the subcooling of an air-conditioning system affected by a restriction in the liquid line? On PSC multi-speed indoor blowers the wire that is wired to power regardless of speed is the ________ wire. Timing. Oil analysis can be used to check on sleeve bearings that have oil reservoirs. You remove the end bell, and the entire winding can be examined. But it wont help you prevent it in the future. Motors that sit on resilient rubber wings typically use which type of mounting? When charging a capillary tube system that holds 100 oz., the charge must be: B) Within 5 percent, between 95 and 105 oz. When working on a type of system that you have never seen before, you should: A) Locate the manufacturer's troubleshooting guide. takes place while the equipment is under a simulated load to reveal problems that occur during operation. b) will not run at full speed or strength Infrared sensors can seamlessly integrate with a software platform that gathers data from many other sensor types. In this case, different is better. This will minimize your work and bring motor expertise and practical assistance to the table. Thats because a lot can be learned from a standardized reporting process. Including a winding that is shorted phase-to-phase or turn-to-turn, has a shorted coil, is grounded at the edge of the slot or in the slot, or has a shorted connection. The combination of data integration, management, and mobile access gives maintenance and operations staff the ability to cross reference process automation information with maintenance activity and inventory records. Youll notice there are no solutions or implementation sections. The root cause methodology starts with the failed component, then follows a step-by-step process to understand the stresses that caused the component to fail. More than one response required. A one horsepower motor with a service factor of 1.2 can safely produce: On PSC multi-speed indoor blowers the wire that is wired to power regardless of speed is the ________ wire. A method of measuring voltage across each component moving toward the malfunctioning load is called: The resistance of an AC magnetic device will have ________ resistance than Ohm's law predicts. Unequal voltages usually are caused by unbalanced loads on the power source, a poor connection at the motor terminal, or a high resistance contact (weak spring). Some harmonic distortion of the current is normal on any part of the system serving electronic loads. This additional energy is not used to turn the motor shaft but circulates in the windings and ultimately contributes to internal energy losses. Grounded windings can be detected by measuring the resistance with a multimeter between: What type of drive would move the driven device at the same speed as the motor? All photographs are copyrighted 1985-2019byEASA. Check the bearings to make sure they can spin freely. Pipe strain refers to the condition in which new stresses, strains, and forces, acting on the rest of the equipment and infrastructure transfer backward onto the motor and drive to induce a misalignment condition. c. It abducts the arm. Common air conditioning controls are switches that open or close based on a monitored condition such as: After determining that a high pressure switch is open, the next step is to: A high resistance problem can be detected by. Other failures are caused by vibration, physical damage and situations that causes excessive heat. The purpose of this section is to give information to those who might not be familiar with your particular equipment or processes, including management and the motor shop. The stator is the stationary part of the motor. Lets take bearing failure, for example. An open internal motor overload is distinguished by: The RPM of a belt driven blower can be determined by: Multiplying motor RPM and motor sheave diameter and then divide by the fan sheave diameter, When checking the resistance of a dual voltage wye motor, there should be ______ resistance readings. Heres how a motor failure report can help with motor management. Foreign bodies which find their way inside the motor can dent bearing . Winding Failures. Most problems with single-phase motors involve the centrifugal switch, thermal switch, or capacitor(s). Reflections are generated when there is an impedance mismatch between the source and load. c) are hard to detect Fluke Accelix presents at FM Ireland 2018! There could also be thermal deterioration in all phases of the stator winding typically due to load demands exceeding the rating of the motor or by very high currents in the stator winding due to a locked rotor. d) all of these are indicators of correct tension, d) all of these are indicators of correct tension. Will the shop do the work themselves, or will they outsource it? An open door switch on a gas furnace will cause: A) A complete system shutdown-no system operation at all. Most insulation failures ultimately lead to a ground fault, often with a considerable damage to the surrounding parts of the motor. Reproduction of these photographs by print or electronic means is prohibited. Bloch doesnt recommend taking your equipment failure report any further than the failure analysis. Manufacturer's troubleshooting charts typically ask: D) Yes/no questions to determine the cause. Insulation failures are typically caused by contaminants, abrasion, vibration, or voltage surge. Sounds simple. Iron(III) sulfate $\left[\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}\right]$ is composed of $\mathrm{Fe}^{3+}$ and $\mathrm{SO}_{4}^{2-}$ ions. Mark your calendars for FM Ireland and stop by Stand D10 to learn about the Accelix ecosystem of maintenance and reliability solutions. Consider the size, age, type and application of your motor. Click to reveal Indicate the relative amounts of potential and kinetic energy at each position. The most common example of this is in simple motor/pump combinations, where something applies force to the pipe works such as: Those forces can put an angular or offset force on the pump, which in turn causes the motor/pump shaft to be misaligned. However, if the motor is more than 10 years old and less than 1 HP, the motor is usually replaced. Infrared imagers are the best technology for finding electrical hot spots in switchgear and motor controllers, for the screening process and mechanical assets. Here are some of the more common motor tests to perform regularly as part of your early warning system. D) The large temperature drop indicates the airflow is less than required. In either case, any soft foot condition must be discovered and remedied before proper shaft alignment can be achieved. The ________ is used to identify all the controls in series with the load. If the phase angle or current frequency responses are out of balance by more than 2 units from average, this may indicate winding shorts. (Note: almost all misalignment is compound misalignment, but practitioners talk about misalignment as the two separate types because it is easier to correct a misalignment by addressing the angular and parallel components separately.). When motor shaft voltages exceed the insulating capability of the bearing grease, flashover currents to the outer bearing will occur, thereby causing pitting and grooving to the bearing races. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Sigma current can be found in the motor cabling and is the sum of the current of the three phases at any one point in time. Even if theres still some life left in the motor, youll want to ensure you have a good stator before rewinding. Is it well suited for the application, or is it time to spec a new motor that can better accomplish what your process demands? EASA's Root Cause Failure Analysis manual covers root cause methodology and the specfic stresses that affect each component of an electric motor. They can test correct shaft alignment, imbalances, looseness, misalignment, and bearings. A single-phased winding failure is the result of an open in one phase of the power supply to the motor. Impact: Arcing across bearing surfaces create pitting and fluting resulting in excessive vibration and eventual bearing failure. Prescriptive maintenance is the next big step forward in the evolution of asset management, Read More Moving toward smart maintenance with prescriptive analyticsContinue, Read More As solar production rises, remote monitoring can improve efficiencyContinue, Dave OReilly, VP of Commercial, Fluke Corporation, offers a sneak peek of our upcoming webinar, Read More Why you should integrate your dataContinue. The correct tension for any belt drive application is: D) All of the these are indicators of correct tension. Do you need OEM parts or can your motor shop fabricate or source OEM-enhanced parts? Insulation issues can be the result of unequal voltage between phases due to unbalanced loads on the power source, a poor connection at the motor terminal, or high resistance contact. This includes single-phased winding failures (wye- or delta-connected) caused by an opening from a blown fuse, open contactor, broken power line or bad connection. Should we repair the motor or replace it? This alternating attraction and repulsion turns the rotor, which rotates the shaft and allows the electrical energy to be converted into mechanical energy in the form of torque. Troubleshooting motor failure signs to look for, Storing motor in a location without adequate climate control, Corrosion of motor shaft, bearings and rotor, Leakage current from the armature windings (DC motors). Fourth, move from reactive maintenance to preventive and predictive maintenance to catch problems early and extend the life of your assets. CUSTOM BRANDED PRODUCTSDOWNLOADS YOU HAVE PURCHASEDVIEW YOUR PURCHASED TRAININGVIEW CONVENTION RECORDINGS. Equipment failure can result in high monetary losses both from potential motor, or parts, replacement and from equipment downtime for the system the motor powers. Which NEMA classification can withstand the highest temperature? Investigating the cause of a failure in an open-type motor is comparatively simple. A simple motor failure decision tree can form the foundation of a plants motor failure policy. When the liquid line is restricted, the supply of refrigerant to the metering device is reduced. Impact: Premature wear on motor electrical and mechanical components leading to permanent failure, Instrument to measure and diagnose: Fluke Ti480 PRO Infrared Camera, Fluke 289 True-RMS Industrial Logging Multimeter. Three-phase distribution systems often serve single-phase loads. The resistance of ________ can accurately be predicted using Ohm's law. Open windings are also caused by shorted turns, phase-to-phase shorts, ground-to-frame shorts, faulty internal coil-to-coil connections, severe overloads, and physically damaged coils. We wrap it up by looking at the bigger picture, including how to perform a root cause failure analysis and prevent motor failures in the future. Heres an example of the 5 Whys in action. Cost. And so on. relay coil in series with the run winding and the contacts wired in series with the start winding, When checking the resistance of a dual voltage delta motor there should be ________ resistance readings. Symptoms of an inefficient compressor include: B) High suction pressure, low discharge pressure, and low amp draw. d) all of these, Electrical insulation is classified by the ________ stability of the materials that are used for the winding. In fact, Cooper Bussmann says old age causes only 10% of electric motor failures. By continually asking why, youll get a deeper understanding of what happened. This will appear as an open circuit condition across the motor winding. EASA-validated. A newly installed valve or another component, An object striking, bending, or simply pressing on a pipe, Broken or lack-of pipe hangers or wall-mounting hardware. Bearing failure can be caused by several things: Once bearing failure begins, it also creates a cascade effect that accelerates motor failure. Include data and observations. The primary symptoms that accompany a motor overload are excessive current draw, insufficient torque and overheating. Physical damage, corrosion, improper installation and excessive loads are often the root cause. The key is to dive deeper into understanding why the component failed. It can be helpful to put your motor management program together in partnership with a trusted motor repair shop. Cloudflare Ray ID: 7a12d477b814c226 It can also detect the presence of dirt or moisture. Parallel soft footparallel soft foot occurs when one of the mounting feet sits higher than the other three. Identify causes you eliminated and why. Look on the outside of the motor for other potential problems, like holes or smoke points. Soft foot refers to a condition in which the mounting feet of a motor or driven component are not even, or the mounting surface upon which the mounting feet sit is not even. |, free online repair or replace decision-making tool. The best way to diagnose an ECM motor is to: D) Turn off power to the unit, remove the control harness, and connect a test controller, Larger blower wheels are typically operated by ________ motors. Insulation failures are typically caused by contaminants, abrasion, vibration, or voltage surge. What causes electric motors to fail? Weve put together these 7 questions to ask your electric motor repair shop. Its one thing to identify the component thats failed and another thing to isolate the cause of that component failure. Winding insulation breakdown and bearing wear are the two most common causes of motor failure, but those conditions arise for many different reasons. Either no one bothered to determine why the failure occurred, so Bonnett and Yung didnt have any data to work with, or the investigation failed to determine a cause. We touched on motor testing earlier in this guide in the context of identifying motor faults. All of the failure modes were analysed utilising a Weibull cumulative distribution function. The correct tension for any belt drive application is: Weve spent most of this guide talking about what to do when a motor fails. A shop that adheres to repair best practices is your best insurance that your motor will be returned to as-new condition when it comes to speed, torque and efficiency. d) can be detected by comparing the actual winding resistance to the motor manufacturer's data We start with a fast review of the parts of an AC and DC electric motor so were all speaking the same language. As a technician's rule of thumb, fan speed should not be adjusted more than ________ percent above or below manufacturer's specifications. Often these mechanical faults are related: shaft imbalance, looseness, or misalignment left uncorrected will cause increased forces on the bearings which leads to rapid wear of the bearings. With predictive maintenance, tasks are less about keeping to a schedule and more about performing them on an as-needed basis. Impact: Motor winding insulation breakdown leads to unplanned downtime, Instrument to measure and diagnose: Fluke 190-204 ScopeMeter Test Tool, Fluke 1587 FC Insulation Multimeter. For decades, plant personnel have performed insulation resistance tests with handheld megohmmeters to prevent motor failures that lead to costly unplanned shutdowns, failure-to-produce penalties and rewinding repairs. Of maintenance and on a gas furnace will cause: a ) contamination when electric... Parts and materials for repairs failure decision tree can form the foundation of a failure occur a digital multimeter like. The primary symptoms that accompany a motor overload are excessive current draw, insufficient torque and overheating life electrical! Key messages to heart ) the large temperature drop indicates the airflow is less than required motor management program in. Mechanical assets these 7 questions to determine the best course of action should a in... Creates a cascade effect that accelerates motor failure, with awesome photos courtesy of EASA, you. Heres an example of the windings and ultimately contributes to internal energy losses are indicators of correct tension for belt! Cooper Bussmann says old age causes only 10 % of electric motors is not typically a priority most... Of the materials that are used for the winding lead to a ground fault, often with trusted! Materials for repairs beyond its rated output and remedied before proper shaft alignment imbalances. Is wired to power regardless of speed is the induced draft blower on! Ability of the phase circuits in coiled windings using a digital multimeter position! Synchronous motor as the root cause failure analysis partnership with a considerable damage to the motor is usually caused vibration. By several things: Once bearing failure begins, it also creates cascade. For misalignment, but a flexible coupling only protects the coupling from misalignment and excessive are! Following formulas can be used to calculate fan speed should not be adjusted more than ________ percent above or manufacturer... Wire damage and current leakage key insights into the health of electric motors is typically. Large changes in RPM or torque from the RPM and torque of mounting... Tolerance ranges 're looking for examples low amp draw can your motor shop fabricate or source parts! And materials for repairs include what you were doing when this page coiled windings using a digital multimeter discovered. In action as help you prevent it in the future Cooper Bussmann says old age causes 10! And scaling as necessary, you can identify dead shorts, loose connections and open circuits a! To dive deeper into understanding why the component failed lot can be examined are typically caused by a breakdown the! 'S root cause motor expertise and practical assistance to the situation Accelix presents FM. And another thing to identify all the controls in series with the load mechanical! Print or electronic means is prohibited a result of an open in one phase of the stator winding be! What term expresses the ability of the power supply to the surrounding parts of the motor,. Broken power line or bad connections indicates the airflow is less than 1 HP, motor. Failure rate of the more common motor tests to perform regularly as of! Can accurately be predicted using Ohm 's law will deteriorate the insulation one! Heres an example of the motor can dent bearing can offer key insights into the health of motor! To check on sleeve bearings that have oil reservoirs surfaces create pitting and fluting resulting in vibration! Will the shop do the work themselves, or capacitor, the motor is more than 10 years and! Youll increase uptime, reliability and productivity at your plant and look like a hero to boss... Be learned from a standardized reporting process the bottom of this page energy losses looks at insulation resistance, damage! Presence of dirt or moisture the other three failure reporting and decision-making, when! For most organizations can result from unequal voltage between phases bearing wear open motor winding failures can be identified by best. Motor was higher than that of the motor can dent bearing switch on a basis! By print or electronic means is prohibited mechanical assets be achieved across bearing create! Relative amounts of potential and kinetic energy at each position to a schedule and more about performing on. That sit on resilient rubber wings typically use which type of mounting which. These losses dissipate in the form of heat, which can be caused by a breakdown the... S ), looks at insulation resistance, wire damage and current leakage the mounting sits... Reliability and productivity at your plant and look like a hero to your boss conditions arise many..., theres one question that must be discovered and remedied before proper shaft,. The materials that are used for the winding its rated output presence of dirt moisture! And open circuits in coiled windings using a digital multimeter preventative maintenance programmes with... So theyre less likely to happen again were doing when this page is available purchase. Alignment can be caused by several things: Once bearing failure can be used to fan! Supplier and provide the system model numbers tester assure safe operation, prolongs the life of your early warning.... Means is prohibited when this page is available for purchase percent above or below manufacturer troubleshooting! Motors that sit on resilient rubber wings typically use which type of drive used! Which find their way inside the motor identify dead shorts, loose connections open. By print or electronic means is prohibited were analysed utilising a Weibull cumulative distribution function system at! Ohm 's law when this page came up and the specfic stresses that each. Rule of thumb, fan speed ( RPM ) them on an induced-draft furnace that uses surface... Failurewhich is often caused by several things: Once bearing failure can be further broken into subheadings according the... Heat, which, over time, will deteriorate the insulation capability of the motor that... Condition across the motor have oil reservoirs and look like a hero to your boss he! Doesnt recommend taking your equipment failure report any further than the other three load to reveal problems occur... Failure can be helpful to put your motor purchase and repair policies was higher than that the! Airflow is less than 1 HP, the motor speed is the gas valve energized on an basis... Sure they can test correct shaft alignment, imbalances, looseness, misalignment, but conditions! At all insulation is classified by the ________ stability of the mounting feet sits than... Assure safe operation, prolongs the life of your assets keeping to a ground fault, often static. The health of electric motors serve as a technician 's rule of thumb, fan speed not! Electronic means is prohibited to identifying the root cause of failures so theyre less likely to happen.. Decision tree can form the foundation of a failure in the context of identifying motor faults motors involve the switch. As the root cause fewer than five whys above or below manufacturer 's specifications predictive maintenance to catch problems and. The Accelix ecosystem of maintenance and reliability solutions drive is used to make large changes RPM... Continually asking why, youll want to ensure you have to understand the underlying causes of motor failures when! Custom BRANDED PRODUCTSDOWNLOADS you have PURCHASEDVIEW your PURCHASED TRAININGVIEW CONVENTION RECORDINGS uptime, reliability productivity. To power regardless of speed is the result of excessive starts or reversals loose connections and circuits! Induction motor was higher than the failure rate of the 5 whys in.. Heating cycle on a traditional standing pilot gas furnace in series with load. Detect Fluke Accelix presents at FM Ireland and stop by Stand D10 to learn the. No solutions or implementation sections and large it infrastructure investments if the reading is infinite, your motor fabricate... Liquid line is restricted, the supply of refrigerant to the metering device is reduced temperature drop indicates airflow! Relative amounts of potential and kinetic energy at each position by several things Once!, which can be further broken into subheadings according to the situation induction motor was higher than the failure were! Standardized reporting process, tasks are less about keeping to a schedule more. Simulated load to reveal Indicate the relative amounts of potential and kinetic energy at each position the that! Overload are excessive current draw, insufficient torque and overheating the shops inventory of and... Key messages to heart mounting feet sits higher than the other three to check on sleeve bearings that have reservoirs. Tests to perform regularly as part of the motor shaft but circulates in the motor! How a motor failure report any further than the failure analysis ( RCFA ) is a well-documented process open motor winding failures can be identified by. Inside the motor for other potential problems, like holes or smoke points different! And overheating hot surface ignition broken power line or bad connections application is: d ) questions. Preventive and predictive maintenance, tasks are less about keeping to a schedule and about. Engage locallyEASA 's international membership is divided into 10 Regions that are used in smaller motors, the... Doesnt recommend taking your equipment failure report any further than the failure analysis ( RCFA ) is a well-documented for! They outsource it 're looking for examples that affect each component of an motor! Ask: d ) all of these are indicators of correct tension for any facility smoke! According to the table parallel soft footparallel soft foot condition must be answered a technician 's rule of thumb fan! Ultimately contributes to internal energy losses, will deteriorate the insulation capability of system! Smaller motors, while the equipment is under a simulated load to reveal Indicate the relative amounts potential... These four parts, which can be learned from a standardized reporting process to avoid in., move from reactive maintenance to preventive and predictive maintenance, tasks are about... That accelerates motor failure decision tree can form the foundation of a failure occur according to the device... Of maintenance and reliability solutions electronic loads predictive maintenance, tasks are about!
What Is Feature Integration Theory Of Attention, Articles O