ELECTRIC MOTOR MAINTENANCE AND TROUBLESHOOTING PDF
Practical Troubleshooting, Maintenance &. Protection of AC Electrical Motors & Drives. Revision Web Site:myavr.info E-mail: [email protected] . Electric Motor. Maintenance and. Troubleshooting. Second Edition. Augie Hand. Mc. Graw. Hill. New York. Chicago San Francisco. Lisbon. London. Madrid. This Electric Motor Repair Course is designed to provide the student with practical information for winding,. repaiT'ina, and troubleshooting alternat:ng current.
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Electric Motor Maintenance and Troubleshooting, 2nd Edition [Augie Hand] on myavr.info *FREE* shipping on qualifying offers. Publisher's Note: Products. Chapter С Maintenance & Troubleshooting. 47 Determine if the problem is mechanical, electrical, or software-related. Motor Maintenance and Inspection. electric motor's usage and failure modes The troubleshooting procedure. should be the prime concern when troubleshooting or doing routine maintenance .
The format with the questions and answers page numbers at the end of each chapter would make it quite useful in the class room, too.
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Of course, the "safety tips" through out are useful to everyone. Great book.
Good delivery, a great book to have on hand in industrial settings. See all 26 reviews. Amazon Giveaway allows you to run promotional giveaways in order to create buzz, reward your audience, and attract new followers and customers. Learn more about Amazon Giveaway. This item: Electric Motor Maintenance and Troubleshooting, 2nd Edition.
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Basic Components of an A/C Electric Motor such as used on heating and air conditioning equipment
This tester is capable of providing diagnostic information for all kinds of motors. Electrical measurements If the motor is completely unresponsive, no ac humming or false starts, take a voltage reading at the motor terminals. If there is no voltage or reduced voltage, work back upstream. Take readings at accessible points including disconnects, the motor controller, any fuses or junction boxes, and so on, back to the over-current device output at the entrance panel.
When there is no electrical load, the same voltage should appear at both ends of the branch circuit conductors. In a three-phase hookup, all legs should have substantially equal voltage readings, with no dropped phase. If these readings vary by a few volts, it may be possible to equalize them by rolling the connections, taking care not to reverse rotation.
The idea is to match supply voltages and load impedances so as to balance the three legs. If the electrical supply checks out, examine the motor itself. If possible, disengage the load.
Electrical Preventive Maintenance and Troubleshooting Control Circuits
This may restore motor operation. With power disconnected and locked out, attempt to turn the motor by hand.
In all but the largest motors the shaft should turn freely. If not, there is an obstruction inside or a seized bearing.
Fairly new bearings are prone to seizure because the tolerances are tighter. This is especially true if there is ambient moisture or the motor has been unused for a while. Often good operation can be restored by oiling front and rear bearings without disassembling the motor.
If the shaft turns freely, set the multimeter to its ohms function to check resistance. The windings all three in a three-phase motor should read low but not zero ohms.
The smaller the motor, the higher this reading will be, but it should not be open. A wide range of DMMs are available to measure voltage, current, and resistance, depending on the motor power ratings.
Electric Motor Maintenance and Troubleshooting
Small universal motors, such as those used in portable electric drills, can contain extensive circuitry including a switch and brushes. In the ohmmeter mode, connect the meter to the plug and monitor the resistance as you wiggle the cord where it enters the enclosure.
Move the switch from side to side and, with a trigger switch taped so it remains on, press on the brushes and turn the commutator by hand. Any fluctuation in the digital readout may point to a defect. Amperage or current readings are useful in motor testing as well.
Does the Operator know what caused the problem, and if so, what, in their opinion, caused the problem? Is the equipment out of sequence? Check controlling sensors in area of problem, then make complete check of all sensors, limit switches and other switches to ensure they are in correct position, have power, are programmed, set, and are functioning correctly.
If and when a problem is found, whether electrical or mechanical, the problem should be corrected and the fault-finding begun anew, a seemingly unrelated fault or defect could be the cause of the problem.
When there is more than one fault, the troubleshooting is exponentially more difficult, do not assume that all problems are solved after completing one, always test the circuit and operation prior to returning the equipment to service. If available, check wiring diagrams and PLC programs to isolate problem.
Electric Motor Data Acquisition
Check that wiring is complete and that wires and connections are tight with no copper strands crossing from one terminal to another or to ground.By the end of each day, our minds were jammed with information. Motors for Makers: If and when a problem is found, whether electrical or mechanical, the problem should be corrected and the fault-finding begun anew, a seemingly unrelated fault or defect could be the cause of the problem.
Measuring electrical characteristics like impedance, inductance and capacitance tell the analyst plenty about the condition of the windings. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure including insulation deterioration, or a deteriorating bearing.
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