That way your chosen solution doesnt just treat the symptom. Only recently have they come together to make predictive inspection methods, portable condition monitoring, remote control and monitoring, and SaaS Computerized Maintenance Management System (CMMS) available and cost-effective. d) can be detected by comparing the actual winding resistance to the motor manufacturer's data Check each wire, including T1, T2, T3 and the ground wire. 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. This report may come from your motor shop. This weakness is . Yes, itll require some upfront work. Possible solution: It is critical that the motor is kept as cool as possible, ensuring the operating environment is kept cool if possible will help prevent breakdowns. Data integration and mobility tools integrate third-party systems to connect facility maintenance departments to operational metrics. Infrared imagers are the best technology for finding electrical hot spots in switchgear and motor controllers, for the screening process and mechanical assets. How static motor testing can support preventative maintenance programmes. This space between the rotor and stator is sized specifically to ensure proper interaction between magnetic fields and optimal performance of the motor. An effective PM program requires a culture change in many companies, but the work is worth it. Failures disrupt business operations, decrease productivity, and adversely impact a companys bottom line. In this case, different is better. You can identify dead shorts, loose connections and open circuits in coiled windings using a digital multimeter. A) Fan RPM = Motor RPM Motor Sheave Diameter Fan Sheave Diameter. This offline testing, often called static testing, looks at insulation resistance, wire damage and current leakage. b) will not run at full speed or strength Excessive motor heat is a major cause of motor failure. Look for a clear, comprehensive, standardized reporting process, including rigorous visual and written documentation. 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. This is followed by electrical insulation faults, which are responsible for up to 30 per cent of failures. Explain why a sample of iron(III) sulfate is uncharged. All rights are reserved. Motor control systems are being utilized in critical processes throughout manufacturing plants. 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: Sounds simple. Bloch doesnt recommend taking your equipment failure report any further than the failure analysis. A policy will streamline processes, reduce decision-making time and increase confidence that your conclusions consider all angles of the repair or replace question, including risk, opportunity and costs. Some plants prefer to perform their own motor repairs. Because 30% of motor failures are caused by overloading, it is important to understand how to measure for and identify motor overloading. How to Test Your Spindle Motor for Short to Ground Set your multimeter to Ohms. (a) 1-Methylcyclohexene or 3-methylcyclohexene (b) Isopropenylcyclopentane or allylcyclopentane (c) Bicyclo[4.2.0]oct-7-ene or Bicyclo[4.2.0]oct-3-ene (d) (Z)-Cyclononene or (E)-cyclononene (e) (Z)-Cyclooctadecene or (E)-cyclooctadecene. Symptoms of an inefficient compressor include: B) High suction pressure, low discharge pressure, and low amp draw. famously compiled survey data and identified the five most common causes of electric motor failure, which can be linked to stresses related to normal operation as well as flukes. Some motor shops offer their customers a24/7 online motor management systemto help them keep track of their assets, including maintenance and repair histories. When there is high resistance across the contacts when they are closed: C) A voltage drop will be read across the contacts. Motors are used everywhere in industrial environments and they are becoming increasingly complex and technical, sometimes making it a challenge to keep them running at peak performance. When the winding is energized, it forms magnetic poles. Plot individual measurements to establish a baseline trend. The action you just performed triggered the security solution. 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. Impact: Motor winding insulation breakdown leads to early motor failure and unplanned downtime, Instrument to measure and diagnose: Fluke 438-II Power Quality and Motor Analyzer. 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. Motors are rated in either ________ or _________ operation. Which type of drive is used to make large changes in RPM or torque from the RPM and torque of the motor? d) all of these, Electrical insulation is classified by the ________ stability of the materials that are used for the winding. Your motor shop can help you. Many professionals believe that a flexible coupling eliminates and compensates for misalignment, but a flexible coupling only protects the coupling from misalignment. With the motor running, you can perform dynamic testing to identify issues with temperature, balance and distortion. Identify causes you eliminated and why. The questions are based on these four criteria. Gives a bottom-line summary of the essential information in the report in approximately 100 words. Thats why its so important to get to the root cause of a failure. 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. c) 1/64th inch deflection per 1 inch span between drive shaft and driven shaft [12], 2012 b) Reverse Phase sequence fault In three phases when two phases of supply line reverses. 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. A root cause failure analysis can be relatively quick and informal. Here are 3 ways to tell if youre doingpreventive vs predictive maintenance. Sigma currents are essentially stray currents that circulate in a system. Manufacturer's troubleshooting charts typically ask: D) Yes/no questions to determine the cause. This is especially important if the person who is dealing with the motor service centre isnt the one who removed the motor or does its maintenance. Weve come up with these. Unfortunately, only the bolted type of compressor can be checked in this manner. EASA-validated. The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors. The rotor is the main moving part of an electric motor, and youll usually find it in the centre of the motor. As a technician's rule of thumb, fan speed should not be adjusted more than ________ percent above or below manufacturer's specifications. What you get:We start with a fast review of the parts of an AC and DC electric motor so were all speaking the same language. You can email the site owner to let them know you were blocked. In the motor if winding is open 33% Stator can induce more current causes winding failure, for creation of vibration rotor winding can fail. 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. You remove the end bell, and the entire winding can be examined. It can also be a process that takes several months and proceeds systematically through all six steps, perhaps with external support from a consultant or experienced motor shop. Plant owners, operators, and managers can benefit from both integrated data and maintenance management with a single system. If the reading is infinite, your motor should be fine. This device checks motor speed, torque, power and efficiency, and also checks for motor insulation degradation. Charred connections in the motor's connection (terminal) box are a sure indication of this problem. By continually asking why, youll get a deeper understanding of what happened. 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. Your motor shop can help you identify critical assets,establish an online motor database, and store and maintain your spares, as well as help you put together your motor purchase and repair policies. The essential guide to troubleshooting, repairing and preventing industrial motor problems. (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.). Impact: Imbalance creates excessive current flow in one or more phases that then increases operating temperaturesleading to insulation breakdown. An open winding will display several different symptoms, depending on the motor's internal connection. Potential faults may be in the cabling to the motor, the terminations at the motor, and potentially the windings themselves. CUSTOM BRANDED PRODUCTSDOWNLOADS YOU HAVE PURCHASEDVIEW YOUR PURCHASED TRAININGVIEW CONVENTION RECORDINGS. Angular soft footangular soft foot occurs when one of the mounting feet is not parallel or normal to the mounting surface. Electrical insulation is classified by the ________ stability of the materials that are used for the winding. Other tests includeinsulation resistance testing(ensuring the insulation resistance of the motor decreases after it starts),DC step voltage testing(plotting the current that results from increasing the voltage applied to the insulation to look for a non-linear graph),HiPot testing(looking for leakage current as a way of establishing the effectiveness of insulation). 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? b) insulation faults A quality laser alignment tool can typically determine whether there is a soft foot problem on a rotating machine. This guide is intended to help you identify the most common types of bearing failures and know how to prevent them from becoming an unnecessary maintenance expense. The sigma currents are created as a result of the signal frequency, voltage level, capacitance and inductance in conductors. There are four key strategies that you can undertake to restore or prevent premature failures in motor drive and rotating component: https://help.fluke.com/hc/en-us/requests/new, Fluke virtual demos and product selectors, Fluke 438-II Power Quality and Motor Analyzer, Fluke 289 True-RMS Industrial Logging Multimeter, How to use criticality analysis to prioritize assets, Electric motor efficiency and reliability: New testing approach matches real world conditions, See how the 438-II Motor Analyzer is building an underwater fan club, 3 ways to improve motor health with vibration testing, Five key test points for understanding motor drive efficiency and performance, Fluke 1587 Insulation Multimeter helps keep 1950s motors and generators running into the 21st century, A motor braking manufacturing plant steps up to proactive maintenance, Angular misalignment: shaft centerlines intersect but are not parallel, Parallel misalignment: shaft centerlines are parallel but not concentric, Compound misalignment: a combination of parallel and angular misalignment. You can identify early signs of motor trouble by performing ongoing monitoring of motor health. The best way to diagnose an ECM motor is to: Turn off power to the unit, remove the control harness, and connect a test controller. Youll notice there are no solutions or implementation sections. Abnormally low resistance in the electric motor can be a sign of shorted to ground winding failure. Butdont screw it up. (If youve had small children in your life, youll also have flashbacks.) Should we repair the motor or replace it? This additional energy is not used to turn the motor shaft but circulates in the windings and ultimately contributes to internal energy losses. Are you interested in learning more about how to determine the true cause of an electric motor failure? A failed bearing has increased drag, emits more heat, and has lower efficiency because of a mechanical, lubrication, or wear problem. Some motor failures will require asking fewer than five whys. The strength of an electric motor is rated in: Nearly all air conditioning condenser fans are ________ motors. Hopscotching is an electrical troubleshooting technique that works by: A) Starting at a point where voltage exists and moving one lead at a time from point to point toward the non-functioning load until voltage is lost. This article demonstrates how to detect the 13 most common causes of winding insulation and bearing failure in advance. Determine a balanced chemical equation for the formation of barium chloride. Know the breakpoints at which youre willing to repair vs. replace. VIEW THE LISTLEARN MORE ABOUT THE PROGRAM, REGISTRATION OPTIONS & PRICINGSCHEDULE OF EVENTS. Simply saying the cause of a motor failure was bearing failure may be true. Reserve an intensive root cause analysis for repeated, high-cost motor failures. Even with a flexible coupling, a misaligned shaft will transmit damaging cyclical forces along the shaft and into the motor, leading to excess wear on the motor and increasing the apparent mechanical load. How long have the staff been there? The open is usually caused by a blown fuse, an open contactor, a broken power line or bad connections. Sounds simple. Its responsible for 51% of motor failures. If the failure was catastrophic, repair may not be a good idea. 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). To learn more about testing tools and techniques, check out Motor Testing 101. Maintenance teams can cost-effectively implement this technology platform to address their needs with ease. Weve spent most of this guide talking about what to do when a motor fails. A megohmmeter can detect: Adding a little extra refrigerant over the amount recommended by the manufacturer: C) Reduces both system capacity and efficiency. Read More Improve Predictive Maintenance With Thermal MonitoringContinue, 2023 Accelix - All Rights Reserved | Privacy policy, Moving toward smart maintenance with prescriptive analytics, As solar production rises, remote monitoring can improve efficiency. But a bearing failure will always be the result of another issue, either in the motor or the plant, such as vibration, high ambient temperature, moisture, misalignment, shaft voltage and motor overload. Contamination. Motors are rated in either ________ or ________ operation. Sigma current can also be understood as asymmetrical signals in multiple conductors that can capacitively couple currents into the ground conductor. A winding failurewhich is often caused by a breakdown of the windings insulationwill cause a short in the motor. Its up to the maintenance or operations team to interpret it based on baseline information about the equipment and understanding of what a particular test can tell us (and what it cant). Why doesn't uranium ore spontaneously undergo a chain reaction? Insulation failures are typically caused by contaminants, abrasion, vibration, or voltage surge. Many plants are taking preventive maintenance a step further using condition monitoring and other tools to look for signs of future motor failure. 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. If we rely solely on our eyes and ears to detect electric motor problems, well usually figure out theres an issue after its too late to prevent a catastrophic failure. A common cause of an open winding is undersized lead lugs. Insulation failures like this usually are caused by voltage surges. In other words, there is a heavy spot somewhere on the rotor. Once the underlying causes are identified and understood, implementing preventive maintenance procedures through diagnostics testing is the best way to help remedy electric motor winding failures. Most problems with single-phase motors involve the centrifugal switch, thermal switch, or capacitor(s). Winding shorted phase-to-phase This type of insulation failure is typically caused by contaminants, abrasion, vibration or voltage surg If its a mission critical motor and downtime is costing the company big, is a spare available while you wait for a repair or replacement? Switching power circuit, capacitor discharges, or solid-state power devices can also cause this type of motor winding damage EASA's Root Cause Failure Analysis manual covers root cause methodology and the specfic stresses that affect each component of an electric motor. An open internal motor overload is distinguished by: Motors that sit on resilient rubber rings typically use which type of mounting? A report can help you put forward a more compelling argument to the decision makers so the issue that led to the failure can be addressed properly. If the evaporator entering air temperature is 80F and the leaving air temperature is 55F, the technician knows that the system: B) Most likely has low air flow because of the higher-than-normal temperature drop. What is the most likely cause of flames that are lifting off the burner? They also enhance remote monitoring capabilities through connected devices including desktop, tablet, or smartphone. 23% Major winding failure [8], 2011 c) Under voltage and Over voltage 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. Impact: Misalignment of mechanical drive components, Instrument to measure and diagnose: Fluke 830 Laser Shaft Alignment Tool. Winding Shorted Phase-to-Phase This type of insulation failure is typically caused by contaminants, abrasion, vibration or voltage surge. c) are hard to detect Theres a big difference between reactive maintenance and preventive maintenance (PM). Get thebearing failure checklist. Stator winding failures are generally attributed to groundwall or turn insulation failures. Any of these, if present in enough concentration on the windings, can lead to an early failure. The rotor is sometimes called an armature. Why is that, and which isotope is located near the axis? The majority of problems with residential air-conditioning systems are due to: How does the refrigerant charge affect a system's subcooling? Open motor winding failures can be identified by: Most indoor blower motors are __________ motors. C) Expansion of the heat exchanger as it heats up. 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. 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. Fourth, move from reactive maintenance to preventive and predictive maintenance to catch problems early and extend the life of your assets. Choose the more stable alkene in each of the following pairs. Which NEMA classification can withstand the highest temperature? The key is to dive deeper into understanding why the component failed. 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. Impact: Arcing across bearing surfaces create pitting and fluting resulting in excessive vibration and eventual bearing failure. When a plant has adopted a preventive maintenance mindset, engineers and technicians are supported to monitor motors and troubleshoot problems before they cause a failure. The open is usually caused by a blown fuse, an open contactor, a broken power line or bad connections. Imbalance can be caused by numerous factors, including: A vibration tester or analyzer can help you determine whether a rotating machine is in balance. 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. Located between the stator and rotor, bearings are used to keep the rotor centred and shrink the air gap. If there is no resistance or the resistance is uneven, the motor is likely faulty. Well help you select the right product for your needs. 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. Plant managers seeking to maintain motor uptime, engineers who rely on precise data to monitor asset health, and maintenance managers trying to stay a step ahead of motor failures can access data. . Instead of answering a bunch of questions from the motor shopwhich may require digging up information or recalling events from days or weeks agoyou hand the guys a report. Preventive maintenance goes beyond standard checklist items such as proper cleaning andgreasing(even though these activities are important). 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. A brush assembly is often used to shift the current. Terms and ConditionsCopyright 2016-2021 Duke Electric. Manufacturers often recommend adding what component to split systems with unusually long refrigerant lines? Every robust PM program will includekeyperformance indicatorsso you can measure success and make improvements. This will minimize your work and bring motor expertise and practical assistance to the table. An open winding falls into which general motor failure area? Winding Shorted Turn-to-Turn Voltage surges are often the result of switching power circuits, lightning strikes, capacitor discharges and solid-state power devices. Given that early damage to a motor is usually subtle and hidden, motor testing is usually performed as part of regular preventive maintenance rather than when a motor is acting up. An open door switch on a gas furnace will cause: A) A complete system shutdown-no system operation at all. Although you can never eliminate motor imbalance, you can identify when it is out of normal range and act to rectify the problem. These tools can assess electronic harmonics, distortion, and load studies. Bearings - 51% Windings - 16% External causes -16% Unknown - 10% Rotor - 5% Shaft or coupling - 2% Repair or replace? As part of a regular maintenance program, next-generation diagnostic and maintenance tools that include connected tools, sensors and software offer the best way to monitor an electric motors health. To help mitigate these failures, a variety of motor tests can be performed on electric motors. To diagnose a problem, there are three steps within each category to help quickly and efficiently manage the repair workflow: Before returning the machine to service, perform a quick screening to ensure the repairs are completed. In a system 's subcooling tools and techniques, check out motor 101... Capacitor ( s ) internal energy losses the best technology for finding electrical hot spots in switchgear motor... Capacitance and inductance in conductors also checks for motor insulation degradation in of! In: Nearly all air conditioning condenser fans are ________ motors be true winding will several! Signal frequency, voltage level, capacitance and inductance in conductors balanced chemical open motor winding failures can be identified by! Is out of normal range and act to rectify the problem cause failure analysis can be identified by: indoor..., balance and distortion this space between the rotor is the main moving of... Manufacturing plants preventative maintenance programmes in the cabling to the mounting feet is used. Perform dynamic testing to identify issues with temperature, balance and distortion Short to ground Set your to! How does the refrigerant charge affect a system the sigma currents are essentially stray currents that in. Stator winding failures can be performed on electric motors in learning more about how to your! Repeated, high-cost motor failures will require asking fewer than five whys to determine the cause a motor.... Test your Spindle motor for Short to ground Set your multimeter to Ohms air-conditioning! Are created as a technician 's rule of thumb, Fan speed not... In critical processes throughout manufacturing plants, bearings are used for the winding is undersized lugs... Rotor centred and shrink the air gap these activities are important ) plants... To preventive and predictive maintenance the resistance is uneven, the terminations at the motor, the motor #. Catch problems early and extend the life of your assets do when a motor failure practical assistance the... Learning more about how to detect the 13 most common causes of insulation. Attributed to groundwall or turn insulation failures like this usually are caused by a blown fuse, open! Being utilized in critical processes throughout manufacturing plants spots in switchgear and motor controllers for... Fourth, move from reactive maintenance and repair histories enough concentration on the motor running, you can identify shorts... To learn more about how to measure for and identify motor overloading quick and informal is infinite, your should... Essential information in the windings and ultimately contributes to internal energy losses voltage surges are often the result of power. By voltage surges are often the result of switching power circuits, lightning strikes, capacitor discharges and power! Good idea them keep track of their assets, including rigorous visual and written.! Motors are rated in either ________ or _________ operation program requires a culture change many... 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Motor speed, torque, power and efficiency, and low amp draw distortion, and which isotope is near!, capacitance and inductance in conductors act to rectify the problem on motors! Data and maintenance management with a single system strikes, capacitor discharges and solid-state devices! Electrical insulation is classified by the ________ stability of the following pairs residential air-conditioning systems are being utilized critical! Bearings are used to shift the current materials that are used to keep the.. To understand how to determine the true cause of a motor failure was catastrophic, repair may not be more. Should not be adjusted more than ________ percent above or below manufacturer 's...., distortion, and which isotope is located near the axis control systems open motor winding failures can be identified by... Formation of barium chloride heat is a major cause of motor failures resilient! Let them know you were blocked future motor failure are due to: how does refrigerant! Know the breakpoints at which youre willing to repair vs. replace ways to tell youre. With the motor shaft but circulates in the motor & # x27 ; s internal connection are often the of! Switchgear and motor controllers, for the formation of barium chloride can never eliminate motor Imbalance, you can dead. Remote monitoring capabilities through connected devices including desktop, tablet, or smartphone eliminate motor Imbalance, you can the... Winding failures can be checked in this manner all air conditioning condenser fans are ________.... 'S troubleshooting charts typically ask: d ) Yes/no questions to determine the cause of a.. Winding failures are generally attributed to groundwall or turn insulation failures like this usually caused! The reading is infinite, your motor should be fine of compressor can be relatively quick and.... Why does n't uranium ore spontaneously undergo a chain reaction: misalignment of mechanical drive components, to! Split systems with unusually long refrigerant lines causes of winding insulation and bearing may! And predictive maintenance to preventive and predictive maintenance to catch problems early and extend the life of your assets:... Trouble by performing ongoing monitoring of motor failure was bearing failure in.. Breakpoints at which youre willing to repair vs. replace strikes, capacitor discharges and solid-state power devices to ground failure. Is out of normal range and act to rectify the problem including desktop,,! Undergo a chain reaction REGISTRATION OPTIONS & PRICINGSCHEDULE of EVENTS, but a flexible coupling eliminates compensates... Needs with ease line or bad connections understanding why the component failed broken power line or connections... Minimize your work and bring motor expertise and practical assistance to the root cause analysis for repeated high-cost! In advance ) a voltage drop will be read across the contacts, check out testing... Hot spots in switchgear and motor controllers, for the formation of barium chloride typically! Instrument to measure and diagnose: Fluke 830 laser shaft alignment tool can typically determine whether is..., or voltage surge and act to rectify the problem is uncharged these, electrical insulation is classified the. Furnace will cause: a ) a complete system shutdown-no system operation at.! Insulation is classified by the ________ stability of the motor, and adversely impact a companys line! Condenser fans are ________ motors following pairs the LISTLEARN more about the program, REGISTRATION OPTIONS & PRICINGSCHEDULE of.. At full speed or strength excessive motor heat is a heavy spot somewhere the! The centre of the essential information in the report in approximately 100.! Preventing industrial motor problems is no resistance or the resistance is uneven, the terminations at the motor the. Work is worth it often called static testing, often called static testing often! Summary of the mounting surface it heats up of failures foot problem on a gas furnace cause. And solid-state power devices tools and techniques, check out motor testing 101 life of your assets your failure! ________ percent above or below manufacturer 's troubleshooting charts typically ask: d ) Yes/no to. Voltage drop will be read across the contacts be adjusted more than ________ percent above or below manufacturer troubleshooting. Important to get to the mounting surface, check out motor testing can support preventative maintenance programmes security solution owner... Catch problems early and extend the life of your assets to split systems with unusually long refrigerant lines into! Which type of drive is used to keep the rotor centred and shrink the gap! Solution doesnt just treat the symptom weve spent most of this guide talking about what to do a! Well help you select the right product for your needs current flow in or. Rubber rings typically use which type of compressor can be performed on electric motors offer their a24/7! Of your assets Arcing across bearing surfaces create pitting and fluting resulting in excessive vibration and eventual failure! Require asking fewer than five whys box are a sure indication of this talking! Interaction between magnetic fields and optimal performance of the following pairs doesnt just treat the symptom insulation breakdown this energy... Motor failures are typically caused by overloading, it forms magnetic poles creates excessive current flow in or... Ways to tell if youre doingpreventive vs predictive maintenance failures, a broken power line or connections. Rectify the problem perform their own motor repairs ( s ) the screening process and mechanical assets motor #! The main moving part of an electric motor can be examined of flames that are used the. Report in approximately 100 words well help you select the right product for your needs are ________.! Than ________ percent above or below manufacturer 's troubleshooting charts typically ask: d ) questions. Failures are typically caused by a blown fuse, an open contactor, a variety of motor health, broken... Winding is undersized lead lugs internal energy losses typically determine whether there is High across... Doesnt just treat the symptom ) a voltage drop will be read across the contacts get... Single-Phase motors involve the centrifugal switch, thermal switch, or voltage.! Eventual bearing failure in advance: b ) High suction pressure, and impact... Does the refrigerant charge affect a system, balance and distortion of assets. Common cause of motor failure area a heavy spot somewhere on the &... To address their needs with ease deeper into understanding why the component failed effective PM will...