d) can be detected by comparing the actual winding resistance to the motor manufacturer's data Motors that sit on resilient rubber wings typically use which type of mounting? If an electrical load in a split-system air conditioner is not working, the technician must determine if the problem is: A) In the load itself or in the switches that control the load. Leveraging these tools offers facilities the greatest flexibility and power to manage the health of electric motor windings. A simple way to do a root cause failure analysis is using the 5 Whys technique. Indicate the relative amounts of potential and kinetic energy at each position. 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. Rotating looseness is caused by excessive clearance between rotating and stationary elements of the machine, such as in a bearing. Three-phase distribution systems often serve single-phase loads. If the motor is less than 1/8 HP, it is almost always replaced. What type of drive would move the driven device at the same speed as the motor? Well help you select the right product for your needs. Thats because a lot can be learned from a standardized reporting process. Foreign bodies which find their way inside the motor can dent bearing . Which NEMA classification that can withstand the highest temperature? c) are hard to detect What is the most likely cause of flames that are lifting off the burner? c) 1/64th inch deflection per 1 inch span between drive shaft and driven shaft Failures disrupt business operations, decrease productivity, and adversely impact a companys bottom line. Is it well suited for the application, or is it time to spec a new motor that can better accomplish what your process demands? Bearing failure is an expensive problem both in terms of motor repair and downtime, so helping to prevent this by measuring shaft voltage and bearing current is an important diagnostic step. Polarization index (PI) testing takes a ratio of the winding insulation resistance after 1 minute and 10 minutes to tell you how well the motor is functioning. Next up is advice on troubleshooting, fault testing, motor failure reporting and decision-making, including when to call in a motor shop. Plant owners, operators, and managers can benefit from both integrated data and maintenance management with a single system. A root cause failure analysis can be relatively quick and informal. Are the techs CSA-certified? A tri-fold brochure containing the information on this page is available for purchase. Look on the outside of the motor for other potential problems, like holes or smoke points. Motor control systems are being utilized in critical processes throughout manufacturing plants. 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 it wont help you prevent it in the future. The imagers test faulty connections, overheated bearings, and tank levels. A winding failurewhich is often caused by a breakdown of the windings insulationwill cause a short in the motor. The motor and insulation tester assure safe operation, prolongs the life of electrical systems and motors. Vertical mount fan motors require __________ to handle the force of the shaft pushing against the end bells of the motor. A) Fan RPM = Motor RPM Motor Sheave Diameter Fan Sheave Diameter. 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. This weakness is . Solid state start relays can be checked by: Which of the following is NOT a standard mounting dimension for an electric motor? Read More Fluke Accelix presents at FM Ireland 2018!Continue, How thermal imaging fosters a better understanding of assets, Read More Every infrared picture tells a storyContinue. Weve put together these 7 questions to ask your electric motor repair shop. 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. Does the shop have a significant amount of experience with your motor? Use a multimeter or an ohmmeter to test the voltage of the electric motor. Reflections are generated when there is an impedance mismatch between the source and load. All rights are reserved. When thats not possiblewhen internal resources are stretched or a repair is too complex, for exampleits critical to choose your motor repair shop carefully. These next-generation maintenance and reliability tools support the generation, collection, and consolidation of data from sensors, tools, and existing systems. Variable frequency drives employ a pulse width modulation (PWM) technique to control the output voltage and frequency to a motor. Soft foot is often manifested between two diagonally positioned mounting bolts, like the way that an uneven chair or table tends to rock in a diagonal direction. The stator produces electromagnetic energy, either through windings or permanent magnets. Electric motors serve as a critical component for any facility. That doesnt mean humans are off the hook, however. The rotor is the main moving part of an electric motor, and youll usually find it in the centre of the motor. Open windings are also caused by shorted turns, phase-tophase shorts, ground-to-frame shorts, faulty internal coil-tocoil connections, severe overloads, and physically damaged coils. Impact: Decrease in motor efficiency results in added cost and an increase in operating temperatures. Keep all of your organizations assets up and running without downtime. 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. From its position in the periodic table, determine which atom in each pair is more electronegative: (a) N or P (b) N or Ge (c) S or F (d) Cl or S (e) H or C (f) Se or P (g) C or Si. to ask deciding whether to repair or replace your electric motor. 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. This website is using a security service to protect itself from online attacks. 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. A carbon brush probe attachment allows you to measure shaft voltage while a motor is rotating. C) Unusual airflow restrictions in the duct. Fluke Accelix presents at FM Ireland 2018! Vertical mount fan motors require ________ to handle the force of the shaft pushing against the end bells of the motor. Start by completely disconnecting the spindle motor from all power sources. CUSTOM BRANDED PRODUCTSDOWNLOADS YOU HAVE PURCHASEDVIEW YOUR PURCHASED TRAININGVIEW CONVENTION RECORDINGS. 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. Tied with windings for almost 1 in 5 motor failures, external factors include temperature, contamination, poor maintenance, inappropriate mechanical loads and events such as flooding. However, whether or not you can see the defective winding, an oil sample should always be taken for evaluation. 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. Instead, he recommends including these four parts, which can be further broken into subheadings according to the situation. Smith, Michael Abbott. The voltage will be ________ immediately after the control that is opening the circuit. Choose the more stable alkene in each of the following pairs. Terms and ConditionsCopyright 2016-2021 Duke Electric. It is found that one isotope is more concentrated near the axis of rotation of the chamber and the other is more concentrated near the cylindrical wall of the chamber. 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. How many years of experience do they have? Bearings - 51% Windings - 16% External causes -16% Unknown - 10% Rotor - 5% Shaft or coupling - 2% Repair or replace? Which organizations specify standards for electric motors? Many plants are taking preventive maintenance a step further using condition monitoring and other tools to look for signs of future motor failure. (Here are7 ways to screw up vibration analysis.). 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. The rotor is sometimes called an armature. Plot individual measurements to establish a baseline trend. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. A split-system air conditioner that does not operate at all most likely has: How can a technician check to see if the coil and condensing unit on an AC split system are matched? Create an archive reference of measurements to facilitate trend analysis and identify change of state conditions. What causes electric motors to fail? 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 other words, there is a heavy spot somewhere on the rotor. Motor design. Excessive motor heat is a major cause of motor failure. The defective winding, an oil sample should always be taken for evaluation a pulse width modulation PWM... Wont help you select the right product for your needs the health of electric?. 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