Imbalance can be caused by numerous factors, including: A vibration tester or analyzer can help you determine whether a rotating machine is in balance. Which of the following is (are) true concerning the pectoralis major? To keep operations running smoothly, implementing preventive maintenance programs leads to a predictive and prescriptive maintenance future. Do they follow the ANSI/EASA AR100 best practices? Get thebearing failure checklist. |, free online repair or replace decision-making tool. It may also occur as a result of excessive starts or reversals. A winding failurewhich is often caused by a breakdown of the windings insulationwill cause a short in the motor. Impedance mismatches can occur as a result of improper installation, improper component selection or equipment degradation over time. 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. This section is where you give the evidence for the cause of the failure. Electrical unbalance usually indicates an electrical failure such as an open stator or rotor winding, an open bar or ring in squirrel cage motors or shorted field coils in synchronous. Indicate the relative amounts of potential and kinetic energy at each position. Motor starting components can be made up of: Internal centrifugal switches, relays, starting, and running capacitors An open internal motor overload is distinguished by: a) measurable resistance between run and start b) infinite resistance between start and common c) infinite resistance between run and common d) all of these d) all of these A simple motor failure decision tree can form the foundation of a plants motor failure policy. It is made of thin metal sheets, called laminations, instead of being solid, to reduce energy losses. What type of drive would move the driven device at the same speed as the motor? Looseness and bearing failures. But it wont help you prevent it in the future. A root cause failure analysis can be relatively quick and informal. We can see your eyes rolling. Second, formalize your documentation and reporting so its easy to get all the information about a particular motor to the people that need it. c) are hard to detect You can add these sections to your failure report if youre responsible for them at your plant, or you can leave them to the motor shop. For this reason, it is important to check machine alignment more than just at the time of installationprecision alignment is a temporary condition that can change over time. The winding failures illustrated here are typical of what can happen is such circumstances. The key is to dive deeper into understanding why the component failed. 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. Why doesn't uranium ore spontaneously undergo a chain reaction? D) The large temperature drop indicates the airflow is less than required. Each harmonic has a different acceptable level of distortion, which is defined by standards such as IEEE 519-1992. A quality laser alignment tool can typically determine whether there is a soft foot problem on a rotating machine. The sigma currents are created as a result of the signal frequency, voltage level, capacitance and inductance in conductors. EASA's new streaming sales videos provide relevant and insightful training. Plot individual measurements to establish a baseline trend. 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. Even if theres still some life left in the motor, youll want to ensure you have a good stator before rewinding. In either case, any soft foot condition must be discovered and remedied before proper shaft alignment can be achieved. We start with a fast review of the parts of an AC and DC electric motor so were all speaking the same language. When the winding is energized, it forms magnetic poles. Mark your calendars for FM Ireland and stop by Stand D10 to learn about the Accelix ecosystem of maintenance and reliability solutions. Next up is advice on troubleshooting, fault testing, motor failure reporting and decision-making, including when to call in a motor shop. to ask deciding whether to repair or replace your electric motor. Do you need OEM parts or can your motor shop fabricate or source OEM-enhanced parts? What causes electric motors to fail? 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. Temperature plays a major role in motor failure. Click to reveal These losses dissipate in the form of heat, which, over time, will deteriorate the insulation capability of the windings. You remove the end bell, and the entire winding can be examined. 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. Non-rotating looseness happens between two normally stationary parts, such as a foot and a foundation, or a bearing housing and a machine. 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. But if youre honest, how much of your time is spent firefighting instead of focusing on your to-do list? The stator is the stationary part of the motor. Instrument to measure and diagnose: Fluke 810 Vibration Tester. 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. However, these tests only provide a "snapshot" of motor health. Winding shorted turn-to-turn and preventive maintenance (PM). The expected temperature drop through a direct expansion evaporator coil: D) Can be determined with a chart supplied by the coil manufacturer. The resistance of ________ can accurately be predicted using Ohm's law. This can lead to bearing destruction within a few months of motor operation. Other failures are caused by vibration, physical damage and situations that causes excessive heat. d) can be detected by comparing the actual winding resistance to the motor manufacturer's data Your motor shop can help you. Sales professionals need to keep their skills sharp in order to discover new leads, nurture promising prospects and close more deals. The most common mechanical faults are shaft imbalance, looseness, misalignment, and bearings. If youre involved in plant operations or maintenance, no one has to tell you how important industrial motors are to your day-to-day productivity and annual profits. 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. Note:Under-voltage and over-voltage (exceedingNEMAstandards) will result in the same type of insulation deterioration. Variable frequency drives employ a pulse width modulation (PWM) technique to control the output voltage and frequency to a motor. The life of a three-phase stator winding can be shortened dramatically when the motor is exposed to unfavorable operating conditions electrical, mechanical or environmental. A) Adding refrigerant increases the system subcooling. Know the breakpoints at which youre willing to repair vs. replace. a) contamination 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. Chances are, you arent the final decision maker on larger operational and capital expenditures. Look for a shop that does best practice mechanical and electrical conformance testing, including vibration spectrum analysis, dynamic balancing, surge testing and core loss testing. These next-generation maintenance and reliability tools support the generation, collection, and consolidation of data from sensors, tools, and existing systems. Infrared sensors can seamlessly integrate with a software platform that gathers data from many other sensor types. When troubleshooting split air conditioning systems be sure to check voltage to: Which of these methods used to determine which component in a circuit is not working properly? Others will need more than five. How unique is it? The way the information is communicated plays an important role in the way the situation is handled and decisions that are made, both for the motor in question and the entire fleet. When charging a capillary tube system that holds 100 oz., the charge must be: B) Within 5 percent, between 95 and 105 oz. De-energized testing runs a motor through its paces while its turned off. It raises the clavicle. 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