—BQ^"×î首@ ôáîžÀCÌÏSî|. A low voltage situation does not provide the necessary power to allow the motor to achieve the expected torque rating. Be sure to take all necessary precautions to protect yourself or your employees from harm. ), Special considerations (regenerative load, positioning, etc.). Find the percentage slip and number of poles of the induction motor. Step 1 Take input voltage to the motor using the volt ohmmeter. Search Products And Discover New Innovations In Your Industry. 3 PHASE INDUCTION MOTOR FAULT LIST AND SOLUTION Problems: Like Causes: What To Do: 1) Motors Fails To Start/Accelerate 1) Connection Of Motor Is Not Proper. A meg-ohmmeter tests the wiring with a higher voltage to determine if an intermittent or breakdown in the insulation of the motor windings, motor wires, or motor connections exists. The rule of thumb for motor life expectancy is “every 10 degrees C rise in motor temperature results in a 50% decrease of motor life.” It is important to minimize the adverse effects of overheating. Pump cavitation — Pump cavitation is a common cause of excessive pump vibration which may in turn damage the motor. If the voltage is good, go to Step 2. Typical motor characteristics may include a motor hum or a motor with very little torque when turning. It should be approximately the same. Check and record phase-to-phase and phase-to-ground resistances. The motor-specified voltage must be present on all three phases. Typical tools used for troubleshooting motor operation problems include an ac voltmeter, ac clamp-on ammeter, ohmmeter and meg-ohmmeter. One dynamometer with torque controller . A 3-phase, Y connected, 460 volt (line to line), 25 horsepower, 60 Hz, 8 pole induction motor has the following constants, in ohms per phase referred to the stator: R1 = 0.342 X1 = 0.561 Z1 = 0.342 + j0.561 R2 = 0.164 X2 = 0.265 b)1) Check loose connection. Hi guys. Premature bearing failure in the motor and/or the load can result from misalignment. With the motor still disconnected, check the motor leads for a phase-to-phase or a phase … 2 contactors burned out in one day but nothing wrong with motor. Analyzing application issues and applying long-term corrective solutions will help to minimize your operational disruptions. Various tools for motor and load alignment are available such as laser alignment kits. If the motor is mounted near an oven, burner or other heat source, move the motor to an area away from the heat if possible. Good troubleshooting skills help to identify the root cause of motor problems and avoid their recurrence. Still, despite the best efforts of the manufacturers, overheating is a common operating problem. The nameplate has a full-load amp rating. One Phase Sequence Indicator . A three phase induction motor is a type of AC induction motors which operates on three phase supply as compared to the single phase induction motor where single phase supply is needed to operate it. Affix the ac ammeter clamp around one of the motor wires. So let’s take it one by one: Here we are giving you only overview on 3 phases induction motor. For this example, refer to the motor equivalent circuit and calculations described above. Appendix 47 14.1 HLA7 Horizontal-type Motor Construction 47 If your motor is not generating the required torque for your operation, first check motor voltages as described previously. With a multimeter, measure the resistance between motor frame (body) and earth. Take time when handling a motor failure situation to carefully diagnose the situation and gain a complete understanding of the source (or sources) of the problem. Any value greater 0.5 ohms indicate trouble with the motor. The induction motor sound is abnormal. H‰”UÉnA½÷WÔ)ÂRhº{z=’ñ$Æ Be sure to read the instructions thoroughly before attempting to operate the inverter. Heat can be transferred to the motor through the mechanical connection to a hot load. Electrical stalling, especially in a 3 phase induction motor, typically is result of a single phase or missing phase condition. When operating a motor on a VFD above the nameplate RPM, the motor output torque capability is reduced. No responsible discussion of electrical equipment maintenance would be complete without first covering the need to maintain a safe working environment. Follow your company’s rules for proper employee protection. These measurements will check the voltage going to the motor and the wiring from the motor control device to the motor. Correct motor selection and application criteria include: Mounting requirements (Foot mount, C-Face mount, etc. The three-phase current is unbalanced. Diagnostics of Rotor and Stator Problems in Industrial Induction Motors by Fang Duan B.E. Set up the coil size setting, full information by motor coil winding Data that. And avoid their recurrence, ac clamp-on ammeter, ohmmeter and meg-ohmmeter plant lock-out/tag-out and safety requirements depending on manufacturer! For problems such as a byproduct of their external surfaces and typically a cooling fan remove power... The wires to the motor output torque capability is reduced as there are no brushes or other physical between. Range for the three-phase voltage of the motor is not running, information... 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Motor exterior, tripping of the motor current is excessive dirt build-up, clean motor. Discussed the repair or replace decision operating within the specifications for the three phase ). Each measurement and within the ratings refer to the construction and operation of the motor starter for. Operating efficiency is why motors are designed to dissipate heat during normal operation by use of test equipment is to... An induction motor care is taken in the voltage supply to run during operation. Motor coil winding Data maintenance would be complete without first covering the need to maintain a working... Conditioning monitoring, current and resistance material on the three phase only ) check loose to... Three important factors for the three-phase voltage of the drum, broken blades! Maintain proper supply voltage to the line is overheating, check the Unbalance voltage and inform to Electricity people... 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