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 Smith, Michael Abbott. Theres a big difference between reactive maintenance and preventive maintenance (PM). To get there, you have to understand the underlying causes of motor failures. b. 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. 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. This will minimize your work and bring motor expertise and practical assistance to the table. Variable frequency drives employ a pulse width modulation (PWM) technique to control the output voltage and frequency to a motor. Shaft failure is the least common cause of motor failure. 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. This will minimize your work and bring motor expertise and practical assistance to the table. 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. Motors that sit on resilient rubber wings typically use which type of mounting? Some harmonic distortion of the current is normal on any part of the system serving electronic loads. An open winding falls into which general motor failure area? Failuresare shown here to help identify the causes of failure, so that, where possible, preventative measures may be taken. The open is usually caused by a blown fuse, an open contactor, a broken power line or bad connections. Your IP: When a split AC system using a capillary tube is overcharged: Three general areas of problems in air-conditioning systems include electrical problems, mechanical problems, and: The evaporator coil operating temperature for a system with a 20F split, 85F return air, and 71F supply air is: A high temperature differential (more than 2 degrees) between return air temperature at the grille and the return air temperature at the unit indicates: When an air-cooled split system operates at low ambient temperatures: C) Low ambient controls are necessary for safe operation. The correct tension for any belt drive application is: Here are 3 ways to tell if youre doingpreventive vs predictive maintenance. If the failure was catastrophic, repair may not be a good idea. Because 30% of motor failures are caused by overloading, it is important to understand how to measure for and identify motor overloading. Always keep accurate and detailed records of your inspection and testing and keep them in one place to make it easy to identify trends and keep track of actions taken. Leveraging these tools offers facilities the greatest flexibility and power to manage the health of electric motor windings. Gives a bottom-line summary of the essential information in the report in approximately 100 words. Shaft voltage is only present while the motor is energized and rotating. What causes the little pops and ticking that can be heard in some furnaces before the blower comes on? 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. 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. Various factors, such as overheating, physical damage . And those issues will have another cause. d) all of these, Electrical insulation is classified by the ________ stability of the materials that are used for the winding. Some plants have complex, detailed motor failure reporting processes, with hundreds of confusing failure codes. The correct tension for any belt drive application is: D) All of the these are indicators of correct tension. It treats the underlying condition that created the situation in the first place. Winding Shorted Turn-to-Turn Some plants prefer to perform their own motor repairs. Keep all of your organizations assets up and running without downtime. It may also occur as a result of excessive starts or reversals. Parallel soft footparallel soft foot occurs when one of the mounting feet sits higher than the other three. Already an expert? An open internal motor overload is distinguished by: Motors that sit on resilient rubber rings typically use which type of mounting? 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. Foreign bodies which find their way inside the motor can dent bearing . The sign to look for is a resistance reading that is different from the manufacturers stated resistance for the winding. All rights are reserved. Failures disrupt business operations, decrease productivity, and adversely impact a companys bottom line. Mark your calendars for FM Ireland and stop by Stand D10 to learn about the Accelix ecosystem of maintenance and reliability solutions. This device checks motor speed, torque, power and efficiency, and also checks for motor insulation degradation. Manufacturer's troubleshooting charts typically ask: D) Yes/no questions to determine the cause. b) insulation faults The rotor is sometimes called an armature. Maintenance teams can cost-effectively implement this technology platform to address their needs with ease. Identify causes you eliminated and why. The questions are based on these four criteria. If not, you might not get the most qualified team or best price. That doesnt mean humans are off the hook, however. A clean, climate-controlled, organized shop makes it easier to work efficiently and take proper care of the motors that are in for repair. Others will need more than five. Buy copies for your salespeople to distribute to your customers and put your companyfront and center byimprinting your company name, logo or otherinformation on the cover! Common causes of winding failure include high temperature, too many starts, contamination, too much current, excessive voltage and physical damage. 13% of motor failures are caused by bearing failure, and more than 60% of the mechanical failures in a facility are caused by bearing wear, so learning how to troubleshoot this potential problem is important. To learn more about testing tools and techniques, check out Motor Testing 101. Bearing failure can be caused by several things: A heavier load than designed for Inadequate or incorrect lubrication Ineffective bearing sealing Shaft misalignment Incorrect fit Normal wear Induced shaft voltages 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. Any time a fuse is replaced or a breaker is reset, which of the following should be checked before operating the system? With single phase motors, the polarity of the shaded pole or start winding determines the motor rotation. Know the breakpoints at which youre willing to repair vs. replace. Get thebearing failure checklist. 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. Most indoor blower motors are ________ motors. Sales professionals need to keep their skills sharp in order to discover new leads, nurture promising prospects and close more deals. Motor overload occurs when a motor is under excessive load. When is the induced draft blower energized on an induced-draft furnace that uses hot surface ignition? Weve put together a separatepreventive maintenance guideto help you out. 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. and preventive maintenance (PM). Some motor shops offer their customers a24/7 online motor management systemto help them keep track of their assets, including maintenance and repair histories. We can see your eyes rolling. We also frequently offer a companion 2-day Root Cause Failure Analysis seminar which includes this book as well as a CD-ROM containing a color version of the book. 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. 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. This condition can create a frustrating situation in which tightening the mounting bolts on the feet introduces new strains and misalignment. Each harmonic has a different acceptable level of distortion, which is defined by standards such as IEEE 519-1992. What is the effect on suction pressure and superheat? Excessive motor heat is a major cause of motor failure. The winding failures illustrated here are typical of what can happen is such circumstances. 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. 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. When an electric motor fails, theres one question that must be answered. Which type of drive is used to make large changes in RPM or torque from the RPM and torque of the motor? e) all of these, When measuring the leads of a multispeed shaded pole motor, there should be measurable resistance between all the leads. We start with a fast review of the parts of an AC and DC electric motor so were all speaking the same language. 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. 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. 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.
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