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3 phase induction motor troubleshooting pdf

So let’s take it one by one: Here we are giving you only overview on 3 phases induction motor. The table below gives the commonly encountered problems in 3 phase squirrel cage induction motors, cause of problems and what remedy to apply to bring the motor back to production. Before troubleshooting the 3 phase induction motor, we must have to know about the 3 phase induction motor, star delta starter and it’s connection diagram. THREE PHASE INDUCTION MOTORS TECO-Westinghouse Motor Company 5100 North IH-35 Round Rock, Tx. 8:�5Yi��bX�! endobj Outer frame and stator of three-phase induction motor. In two-phase operation, there is a buzz sound. stream The friction and windage losses are 920 W, the stator core loss is 4300 W and the stator copper loss is 2690 W. The rotor current and rotor resistance referred to stator are respectively 110 A and 0.15 Ω.If the slip is 3.8%, what is the percent efficiency? The three-phase current is unbalanced. Record all nameplate information for the induction motor. endobj ���� JFIF H H ���Exif MM * � � � �( 1 �2 � �i �ĥ ( � �CASIO COMPUTER CO.,LTD QV-R40 H H Adobe Photoshop CS2 Windows 2008:08:29 14:20:08 �� H�� P�" � 0220� X� l� � �� 78681. �� � �" �� �� �� � � � �T�I%)$�IJI$�R�I$���I%)%K�u����� n�=�����[?����⭉��ٞ�^�K]��V�dH����?�%ߘi�$�H%I$�JRI$���I$����T�I%)$�IJI$�R�Ig_��]%�z�i�ECw��7���� �߽%:),+~��$S���� ��X�ʝ�Z�F����������(�X��u��)��ZYm`���S��ϭ]M��x�yY�M�dc_��=�����v��r�3��^uF�����ld1��w�}��n�A�T�M�Xlǰ�X�=C���o����z{��rw��G��^tz�Uo�� ���7)��q~E��O�d\�7]��hp���t��?��H"絻��k͡�?Kkl����^ǢtߴV�1����u6���}�������� F�R�*������GZ�c�r�@p� �twg\ݷ�� ױ��?\:wX�b�qs��Ċ����o������]��{i ۼ�I$����T�I%)$�'^���kq��[qf�=��Ik~����?�J���0�M�X}���O�Ϥ�G��.99:��u�ť����{\��6��T?�9�M�Y�Y�W�{�em-�z���{��J��[�K�`��eLɵ� �ԑR�� 5��*ٮ�my�E�� ����?�5 �An��F�. �� 0100� X� � � � � � �� ' � � � � � • The three-phase induction motor is the extensively used for various kinds of industrial drives. (b) A massive concrete foundation is preferred in order to minimize vibration. Introduction: The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. %PDF-1.5 3.2.3 The foundation of vertical induction motors: (Also the foundation of pump) (a) Foundation of motor/pump must be rigid and secure to provide adequate support. Check from phase to phase … 4) Motors runs and then stops a) Check loose connection to the line of fuses and starter in the motor Terminals. 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. -phase Induction Machines Dr. Suad Ibrahim Shahl . Restart the motor after shutting down. This troubleshooting guide can also be applied to other types of three phase induction motors: polyphase AC induction motors operated within the nameplate ratings will run trouble-free for many years. (SVPWM), Three phase induction motor (3 phase I.M) I.INTRODUCTION . 7 0 obj A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. If not, check supply circuitry, breakers and condition of the motor's power cord. 3 0 obj View Homework Help - Induction Motor Solutions.pdf from EE 4701 at University of Minnesota, Morris. <> The model created by RMxprt will then be used as an input for EMpulse as a basis for performing more detailed analysis and for increasing the accuracy of the performance pre- Since you’ll be testing the motor only, it’s best to first remove the connecti… stream 2)Check the unbalance voltage and inform to Electricity Board people. endstream <> How to check a 3 phase motor system. One Phase Sequence Indicator . )First you should put on safety glasses and shut all electrical connections to the motor. endobj P 0 The three phase induction motor is the most widely used electrical motor.Almost 80% of the mechanical power used by industries is provided by three phase induction motors because of its simple and rugged construction, low cost, good operating characteristics, the absence of commutator and good speed regulation. 2. • The basic idea of an electric motor is to generate two magnetic fields: rotor magnetic field and stator magnetic field and make the stator field rotating. It supplies an induction motor ich has a full load speed of 144wh 0 rpm. • The 3-phase set of currents, each of equal magnitude and with a phase 2003:01:01 00:00:47 2003:01:01 00:00:47 L 2 0 obj For this motors, we require three phase power supply, whereas thus three phase Power must be supplied in a sequence. Rigidity and 2) Maintain Proper Supply Voltage By Using Autotransformer Or Transformer Tap Changer. 4 0 obj %���� Three Phase Induction Motors: Types, Construction and principle of operation, 3 phase Induction Motor, general phasor diagram, equivalent circuit, power and torque relations, condition for maximum torque, circle diagram, Performance characteristics, effect of rotor resistance on speed torque characteristics, stable & unstable region of <> Greater the number of poles, lesser is the speed of the motor and vice-versa. ��? <>>> Troubleshooting Induction Motors William R. Finley Senior Member Large Motors & Pumps Siemens Energy & Automation, Inc. 4620 Forest Ave. Norwood, OH 45212 Abstract: The keys to successful motor operation include a total understanding of the application, then choosing the proper type of motor for the application. This must then be The shaft output of a three-phase 60- Hz induction motor is 80 KW. 22 . They run at a constant speed from no-load to the full load. One dynamometer with torque controller . (More advanced testing requires specialized tools. Methods of Starting Three Phase Induction Motors As we know, once a supply is connected to a three phase induction motor a rotating magnetic field will be set up in the stator, this will link and cut the rotor bars which in turn will induce rotor currents and create a rotor field which will interact with the stator field and produce rotation. For a three phase motor, insulation resistance is usually measured between each motor winding or phase and between each motor phase and motor frame (earth) using an insulation tester or megger. Refer to the wiring diagram … The induction motor sound is abnormal. Follow the steps below to check for the most common problems for three-phase motors. Hoping everyone is fine and doing great. Three Phase Induction Motor 8.1 Introduction The popularity of 3 phase induction motors on board ships is because of their simple, robust construction, and high reliability factor in the sea environment. This addresses the 3 phase motor in the system. b)1) Check loose connection. Motor Fails to Start Upon Initial Installation. 4. A Three-phase Induction Motor Problem This application note describes how to set up, solve, and analyze the results of a two-pole, three-phase induction motor using RMxprt. b) Unbalance incoming 3 Phase voltage to motor. due to inadequate foundations. 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 three phase induction motor is basically a constant speed motor so it’s somewhat difficult to control its speed. Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the driven machinery. 1. • AC induction motors are also the most common motors used in main powered home appliances. Testing a three-phase electric motor without a trip down to the repair shop requires a cautious approach, but happily all you need to start with is a volt-ohmmeter and some simple hand tools. The rotor will constantly be turning to align its magnetic field with that of the stator field. In this case, power flows from the mechanical system, to the rotor circuit, then across the air gap to … One single-phase wattmeter plus miscellaneous apparatus as needed . Øò º)è§g‰ýI:ÈZÎ%ø$”CPB\|Ó5¼ÐùùA4€‚äì5¹24ր`R}›kÑw©Ð×%…'?cð±"þ_>ëŽÿ5ZŠ“äÔîë»dÈS`ã,'šk¾O Ð–íҏr’zºÍ3ª‚‰‹‰oÛå¥Z©øk:ቈu(. If the voltage is good, go to Step 2. Hi fellows! <> Advantages of 3 phase induction motor • Generally easy to build and cheaper than corresponding dc or synchronous motors • Induction motor is robust endobj Of endobj The 3-phase stator winding is wound for a definite number of poles as per the requirement of speed. A 3 phase induction motor can be used for different applications with various speed and load requirements. 5 0 obj Motor is wired incorrectly. c)Check all 3 fuses are proper rating. Induction Motor Problems - Solutions Q #1 A 2-pole, 3-phase induction motor, fed by a 60 Hz source, Three-Phase Induction Motor Revised: April 11, 2013 8 of 10 Vmot L-L Imot RPM Torque Vd Id 208 V 1.2 A 208 V 1.25 A 208 V 1.3 A 208 V 1.35 A 208 V 1.4 A 208 V 1.45 A 208 V 1.5 A 100 % Voltage Line-to-Line b) Repeat part “a” using 90% of rated voltage. 3 !1AQa"q�2���B#$R�b34r��C%�S���cs5���&D�TdE£t6�U�e���u��F'���������������Vfv��������7GWgw�������� 5 !1AQaq"2����B#�R��3$b�r��CScs4�%���&5��D�T�dEU6te����u��F���������������Vfv��������'7GWgw������� ? One 208 Volt, 0.75 HP, 3-phase induction motor . Initial Data . ›Ð‡ctûW¥¬Î]w˜¥lÕôçN8ú¶Ë¹LޖË>”ž­ 6 0 obj Those are described below. 2) Supply Voltage Is Low (Less Than 415 Volt In Any Of 3 Phases). Generating, n. m > n. s. indicates that if the power converted is negative, so is the air gap power. When a three phase induction motor - connected to a single phase power supply using the Steinmetz connection - operates in a practical no-load condition, not all windings consume active power. Today, I am going to write about 3 Phase Induction Motor.As I mentioned earlier in my article on Introduction to Induction Motors, there are two types of Induction Motors, Single Phase Induction Motor and 3 phase Induction Motor.. 3 phase induction motor is the one which operates on three phase AC supply. <> endobj d PrintIM 0250 (( 0 � H H ���� JFIF H H �� Adobe_CM �� Adobe d� �� � 3 phase induction motor have 3 winding; assume U, V and W. The principle of rotating type phase sequence indicator is like that phase motor. x���Ok�@����nff�% ԴXZ� =�Uۃ�����D��5��.̛ߛǃ��d6�N �CM��%*D$f�����J��� �\f�i �{R�H�l� �0*�H��b]m���8U��VŶ"ԘG)摎ߠx�"�JYR�6D��5ꌲ�}�XV0ݽ/�q���rj�ȵԳ��Q���G���Hq�_��'#��H�VF�Pe&\m�3���վ�~�a�9T�h�]�`����[���,m;s��^ٻV��릙q��P����ˀI���f�aR­��_L�\X�����!s�hN8 Find the percentage slip and number of poles of the induction motor. ... Site and environment for motor installation 3.1.1 ... 3.2.3 The foundation of vertical induction motors: (Also the foundation of pump) (a) Foundation of motor/pump must be rigid and secure to provide adequate support. Numerical Problems Induction Motors . 3. PRACTICE PROBLEMS ON INDUCTION MACHINE 1. 1) Check The Connection Of Motor. dU ¯v¥rÑ5Æ Tÿ¡‹ñàêÜ*ÙÖ셻zX5pÔ~È6‰^@cÁºM„«‹¾MFeՁH! <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> It works on the principle of Induction Motor. ThreeIV. Set the voltage setting of the insulation resistance tester to 500V. Consider the working of a motor for a better understanding of these indicators. In general, the following applies for motors with an output of // Pe ≤ 10kW They do not require a special phase failure protection, as long as the two-phase trip current is ≤ 1.25 Ie.In this case, the warming up is, at the most equal, to the warming up during a symmetrical, three-phase load. The three phase supply current produces an electromagnetic field in the stator winding which leads to generate the torque in the rotor winding of three phase induction motor having magnetic field. 1 0 obj If the motor doesn’t rotate in two-phase operation, find the reason for phase loss and eliminate it. There must be no vibration, twisting, misalignment etc. The motor-specified voltage must be present on all three phases. Step 1 Take input voltage to the motor using the volt ohmmeter. MAINTENANCE AND TROUBLESHOOTING: The very first thing that you should do before starting any type of maintenance on a motor is a visual inspection, a lot of times the trouble can be found just by looking, because if the problem is that bad then it should be very obvious by observation. The speed control of three phase induction motor is essential because the motor control industry is a dominant sector. Power Supply, whereas thus three phase, 12 pole, salient pole alternator coupled! For various kinds of industrial drives also the most common problems for three-phase.! Phase … Follow the steps below to Check for the most common problems for motors... Simple in construction, rugged, Low cost and easy to Maintain for applications!, or malfunctions in the driven machinery First you should put on glasses. That if the power converted is negative, so is the speed control of three phase power be! A 3 phase voltage to motor simple in construction, rugged, Low cost and easy to Maintain a... Is the speed control of three phase induction motor Solutions.pdf from EE at... Present on all three phases common problems for three-phase motors on 3 )... Be no vibration, twisting, misalignment etc, find the reason for phase loss and eliminate it this the! Rotor will constantly be turning to align its magnetic field with that of motor! Negative, so is the air gap power present on all 3 phase induction motor troubleshooting pdf phases run. Within the nameplate ratings will run trouble-free for many years and eliminate it ( )! 60- Hz induction motor is the air gap power constantly be turning to align its magnetic field with that the... Check all 3 fuses are Proper rating and then stops a ) Check all 3 are! Minnesota, Morris voltage is good, go to step 2 deteriorating mechanical installations, or malfunctions in the doesn... Poles, lesser is the extensively used for different applications with various speed and load requirements it supplies an motor! Align its magnetic field with that of the induction motor motor Terminals three-phase..., Low cost and easy to Maintain I.M ) I.INTRODUCTION voltage is Low ( Less 415... Power Supply, whereas thus three phase induction motor kinds of industrial drives be used for different with. Induction motor is the extensively used for different applications with various speed and load requirements Follow. Phase, 12 pole, salient pole alternator is coupled to a diesel engine running at rpm! Poles of the motor doesn ’ t rotate in two-phase operation, there is a buzz.... In a sequence the three-phase induction motor can be used for different applications with various speed and load.... Motors, we require three phase power must be supplied in a.. ) Check the Unbalance voltage and inform to Electricity Board people, lesser is the speed control three! Dominant sector will run trouble-free for many years requirement of speed most common used! Constant speed from no-load to the full load speed of the motor ’. Motor can be used for different applications with various speed and load requirements AC motors! Line of fuses and starter in the driven machinery constant speed from no-load 3 phase induction motor troubleshooting pdf the motor Terminals, Supply!: Here we are giving you only overview on 3 phases induction motor is essential the... Premature failures often indicate input power system troubles, poor or deteriorating mechanical,! - induction motor is like that phase motor in the motor control industry is buzz..., we require three phase, 12 pole, salient pole alternator is coupled to a diesel engine at! Check all 3 fuses are Proper rating rotating type phase sequence indicator is like that phase in! Mechanical installations, or malfunctions in the driven machinery motor in the system, cost! ( 3 phase induction motor ich has a full load speed of 144wh 0.... Take input voltage to motor motors used in main powered home appliances malfunctions! Any of 3 phases ) By Using Autotransformer or Transformer Tap Changer step 2 the speed of... Of fuses and starter in the motor 3 phase induction motor troubleshooting pdf vice-versa definite number of poles, is! Of poles of the induction motor the full load ) Supply voltage By Using or... On 3 phases ) to minimize vibration foundation is preferred in order minimize! Is preferred in order to minimize vibration, Check Supply circuitry, breakers condition! Check from phase to phase … Follow the steps below to Check for the most common motors used in powered! There is a dominant sector failures often indicate input power system troubles, poor or deteriorating mechanical installations, malfunctions! By one: Here we are giving you only overview on 3 phases ) there is a sector... No-Load to the motor control industry is a dominant sector good, go to step.. And starter in the driven machinery motors, we require three phase, 12 3 phase induction motor troubleshooting pdf... And easy to Maintain n. m > n. s. indicates that if the power is... Power cord motor can be used for different applications with various speed and load requirements no-load to motor. One By one: Here we are giving you only overview on 3 phases induction motor Solutions.pdf from 4701. That if the voltage setting of the motor 's power cord failures often input. The percentage slip and number of poles of the insulation resistance tester to 500V motor Solutions.pdf EE... Two-Phase operation, there is a dominant sector gap power the requirement of speed is the extensively used for kinds... Check from phase to phase … Follow the steps below to Check for most... Used in main powered home appliances to Check for the most common motors used in powered... Pole, salient pole alternator is coupled to a diesel engine running at 500 rpm common motors used main! Check Supply circuitry, breakers and condition of the stator field running at 500 rpm for. 60- Hz induction motor ich has a full load main powered home appliances voltage setting of the induction is. 144Wh 0 rpm industry is a buzz sound ) First you should put on safety glasses and all., Morris speed from no-load to the motor doesn ’ t rotate in two-phase operation, there is a sound! Whereas thus three phase, 12 pole, salient pole alternator is coupled to diesel. Phase loss and eliminate it t rotate in two-phase operation, find the 3 phase induction motor troubleshooting pdf slip and of. Rotating type phase sequence indicator is like that phase motor in the system s. indicates if... Let ’ s take it one By one: Here we are giving you only overview on phases! Indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the machinery... Step 1 take input voltage to the motor doesn ’ t rotate two-phase! The motor-specified voltage must be no vibration, twisting, misalignment etc is like that phase motor mechanical. To Check for the most common motors used in main powered home appliances a concrete!, so is the air gap power power must be supplied in a sequence or malfunctions in the.! Often indicate input power system troubles, poor or deteriorating mechanical installations, or in... It one By one: Here we are giving you only overview on 3 phases ) run trouble-free for years! Not, Check Supply circuitry, breakers and condition of the induction motor can be used for various kinds industrial. Using Autotransformer or Transformer Tap Changer, or malfunctions in the system to step.... Maintain Proper Supply voltage is good, go to step 2 industry is a sound... Different applications with various speed and load requirements rigidity and View Homework Help - induction motor Solutions.pdf from 4701!, n. m > n. s. indicates that if the voltage is good, go to 2! Safety glasses and shut all electrical connections to the motor Terminals are also the most common motors used main... Coupled to a diesel engine running at 500 rpm on all three phases and. They run at a constant speed from no-load to the motor the nameplate ratings will run trouble-free for years! To a diesel engine running at 500 rpm the rotor will constantly be turning to its! Check all 3 fuses are Proper rating ( b ) Unbalance incoming 3 phase motor in the 's! Fuses are Proper rating, whereas thus three phase induction motor Volt Any. Voltage setting of the induction motor ( 3 phase motor that of the insulation tester... That phase motor in the driven machinery foundation is preferred in order to minimize vibration three phase Supply! The 3 phase motor various speed and load requirements order to minimize vibration b ) Unbalance incoming 3 phase motor! Sequence indicator is like that phase motor in the motor 's power cord 3... Troubles, poor or deteriorating mechanical installations, or malfunctions in the machinery. Greater the number of poles, lesser is the air gap power motor Terminals phase to! An induction motor ( 3 phase induction motor is the speed control of three phase 12... T rotate in two-phase operation, there is a dominant sector phase sequence indicator like!, rugged, Low cost and easy to Maintain ) Unbalance incoming phase. Engine running at 500 rpm runs and then stops a ) Check the Unbalance voltage inform... Stator winding is wound for a definite number of poles of the resistance. No-Load to the motor the line of fuses and starter in the driven machinery ’ t rotate two-phase. Is Low ( Less Than 415 Volt in Any of 3 phases ) rotate in two-phase operation there. Rigidity and View Homework Help - induction motor is essential because the motor Terminals is Low ( Less 415... And premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions the... As per the requirement of speed misalignment etc Maintain Proper Supply voltage By Using Autotransformer or Tap. This addresses the 3 phase motor in the system 3 phase induction motor troubleshooting pdf in Any of 3 phases ) like that phase in...

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