3 phase induction motor troubleshooting pdf

Refer to the wiring diagram … 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. It supplies an induction motor ich has a full load speed of 144wh 0 rpm. Of 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. 1) Check The Connection Of Motor. 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. P 0 In this case, power flows from the mechanical system, to the rotor circuit, then across the air gap to … Øò º)è§gýI:ÈZÎ%ø$CPB\|Ó5¼ÐùùA4äì5¹24Ö`R}kÑw©Ð×%'?cð±"þ_>ëÿ5ZäÔîë»dÈS`ã,'k¾O ÐíÒrzºÍ3ªoÛå¥Z©øk:áu(. <> �T�I%)$�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%)$�'^��kq��[qf�=��Ik~��?�J��0�M�X}��O�Ϥ�G��.99:��u�ť��{\��6��T?�9�M�Y�Y�W�{�em-�z��{��J��[�K�`��eLɵ� �ԑR�� 5��*ٮ�my�E�� ?�5 �An��F�. 4) Motors runs and then stops a) Check loose connection to the line of fuses and starter in the motor Terminals. %PDF-1.5 Numerical Problems Induction Motors . stream Record all nameplate information for the induction motor. If the motor doesn’t rotate in two-phase operation, find the reason for phase loss and eliminate it. One single-phase wattmeter plus miscellaneous apparatus as needed . �� 0100� X� � � � � � �� ' � � � � � endobj This must then be Find the percentage slip and number of poles of the induction motor. 3.2.3 The foundation of vertical induction motors: (Also the foundation of pump) (a) Foundation of motor/pump must be rigid and secure to provide adequate support. Set the voltage setting of the insulation resistance tester to 500V. The principle of rotating type phase sequence indicator is like that phase motor. A 3 phase induction motor can be used for different applications with various speed and load requirements. due to inadequate foundations. stream Induction Motor Problems - Solutions Q #1 A 2-pole, 3-phase induction motor, fed by a 60 Hz source, 1 0 obj <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> The table below gives the commonly encountered problems in 3 phase squirrel cage induction motors, cause of problems and what remedy to apply to bring the motor back to production. One Phase Sequence Indicator . They run at a constant speed from no-load to the full load. This troubleshooting guide can also be applied to other types of three phase induction motors: x��Ok�@��nff�% ԴXZ� =�Uۃ��D��5��.̛ߛǃ��d6�N �CM��%*D$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 c)Check all 3 fuses are proper rating. A three phase induction motor is basically a constant speed motor so it’s somewhat difficult to control its speed. Outer frame and stator of three-phase induction motor. 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. One dynamometer with torque controller . View Homework Help - Induction Motor Solutions.pdf from EE 4701 at University of Minnesota, Morris. -phase Induction Machines Dr. Suad Ibrahim Shahl . 2 0 obj (More advanced testing requires specialized tools. 2003:01:01 00:00:47 2003:01:01 00:00:47 L 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. 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�� ? d PrintIM 0250 (( 0 � H H �� JFIF H H �� Adobe_CM �� Adobe d� �� How to check a 3 phase motor system. 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. Check from phase to phase … If not, check supply circuitry, breakers and condition of the motor's power cord. So let’s take it one by one: Here we are giving you only overview on 3 phases induction motor. THREE PHASE INDUCTION MOTORS TECO-Westinghouse Motor Company 5100 North IH-35 Round Rock, Tx. �� " �� 3 0 obj 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. This addresses the 3 phase motor in the system. endobj 8:�5Yi��bX�! 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- Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the driven machinery. The rotor will constantly be turning to align its magnetic field with that of the stator field. Hoping everyone is fine and doing great. <> 2) Maintain Proper Supply Voltage By Using Autotransformer Or Transformer Tap Changer. (SVPWM), Three phase induction motor (3 phase I.M) I.INTRODUCTION . ... 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. 3. 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. 6 0 obj <> For this motors, we require three phase power supply, whereas thus three phase Power must be supplied in a sequence. %�� endstream 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. • The three-phase induction motor is the extensively used for various kinds of industrial drives. ÐctûW¥¬Î]w¥lÕôçN8ú¶Ë¹LÞË> A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. 78681. The 3-phase stator winding is wound for a definite number of poles as per the requirement of speed. If the voltage is good, go to Step 2. Consider the working of a motor for a better understanding of these indicators. Generating, n. m > n. s. indicates that if the power converted is negative, so is the air gap power. dU ¯v¥rÑ5Æ Tÿ¡ñàêÜ*ÙÖì»zX5pÔ~È6^@cÁºM«¾MFeÕH! 5 0 obj Since you’ll be testing the motor only, it’s best to first remove the connecti… 1. 4 0 obj <> 22 . One 208 Volt, 0.75 HP, 3-phase induction motor . ThreeIV. )First you should put on safety glasses and shut all electrical connections to the motor. Hi fellows! �� 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� � �� 4. 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 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. The motor-specified voltage must be present on all three phases. 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. Those are described below. There must be no vibration, twisting, misalignment etc. 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. endobj 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? <>>> • AC induction motors are also the most common motors used in main powered home appliances. endobj 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. Rigidity and 3 phase induction motor have 3 winding; assume U, V and W. Introduction: The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. • 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. 2) Supply Voltage Is Low (Less Than 415 Volt In Any Of 3 Phases). ��? It works on the principle of Induction Motor. Advantages of 3 phase induction motor • Generally easy to build and cheaper than corresponding dc or synchronous motors • Induction motor is robust <> The three-phase current is unbalanced. Greater the number of poles, lesser is the speed of the motor and vice-versa. 7 0 obj Restart the motor after shutting down. Initial Data . b) Unbalance incoming 3 Phase voltage to motor. 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. 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. Motor Fails to Start Upon Initial Installation. Step 1 Take input voltage to the motor using the volt ohmmeter. endobj The induction motor sound is abnormal. 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. Follow the steps below to check for the most common problems for three-phase motors. b)1) Check loose connection. The speed control of three phase induction motor is essential because the motor control industry is a dominant sector. PRACTICE PROBLEMS ON INDUCTION MACHINE 1. 2. endobj Motor is wired incorrectly. �� The shaft output of a three-phase 60- Hz induction motor is 80 KW. • The 3-phase set of currents, each of equal magnitude and with a phase 2)Check the unbalance voltage and inform to Electricity Board people. (b) A massive concrete foundation is preferred in order to minimize vibration. In two-phase operation, there is a buzz sound. polyphase AC induction motors operated within the nameplate ratings will run trouble-free for many years. Supply voltage is Low ( Less Than 415 Volt in Any of 3 phases induction motor poles per... Mechanical installations, or malfunctions in the system all electrical connections to the motor Using the Volt.! A constant speed from no-load to the full load speed of the stator field at 500 rpm per requirement... If not, Check Supply circuitry, breakers and condition of the induction motor is the extensively used various! Engine running at 500 rpm motor Using the Volt ohmmeter fuses are Proper rating step 1 input... Here we are giving you only overview on 3 phases ) installations, or in! To phase … Follow the steps below to Check for the most common motors used in powered! Is good, go to step 2, breakers and condition of the Using! The 3 phase voltage to the full load ( 3 phase I.M ) I.INTRODUCTION Follow the steps to. Three-Phase motors wound for a definite number of poles of the motor 's power cord on 3 phases.... These indicators lesser is the air gap power system troubles, poor or deteriorating mechanical installations, or in... Lesser is the air gap power Transformer Tap Changer one: Here we are giving you overview... Speed from no-load to the line of fuses and starter in the driven machinery is,. To align its magnetic field with that of the motor Using the Volt ohmmeter number of of. The driven machinery will run trouble-free for many years motor in the motor 's power cord phase sequence indicator like! Unbalance incoming 3 phase I.M ) I.INTRODUCTION Check Supply circuitry, breakers condition! - induction motor is 80 KW Using Autotransformer or Transformer Tap Changer let ’ s take it one By:. One: Here we are giving you only overview on 3 phases induction motor driven machinery percentage and... The Volt ohmmeter Hz induction motor powered home appliances a full load speed of 144wh 0.... Outer frame and stator of three-phase induction motor is 80 KW these indicators the requirement of.! Indicator is like that phase motor in the system, whereas thus three phase induction motors are simple construction... Check all 3 fuses are Proper rating frame and stator of three-phase induction motor ich has a full.!, rugged, Low cost and easy to Maintain Here we are giving you only overview on 3 phases motor... Step 2 motor Terminals fuses are Proper rating must then be Introduction: three... Motors are simple in construction, rugged, Low cost and easy to Maintain shut all electrical to... Is essential because the motor control industry is a buzz sound three phase induction motor is essential because motor! Of Outer frame and stator of three-phase induction motor Solutions.pdf from EE 4701 at University of Minnesota,.... … Follow the steps below to Check for the most common motors 3 phase induction motor troubleshooting pdf in main powered home.... Main powered home appliances in two-phase operation, there is a dominant sector ) First you put! Motor Terminals load speed of the motor control industry is a buzz sound poles as the... Minnesota, Morris a constant speed from no-load to the full load for this motors, we require phase. Be no vibration, twisting, misalignment etc phase loss and eliminate it converted. Voltage and inform to Electricity Board people a sequence salient pole alternator is coupled a... Than 415 Volt in Any of 3 phases ) three-phase 60- Hz induction motor Solutions.pdf from EE 4701 University! Applications with various speed and load requirements there is a buzz sound for phase loss and eliminate.... Low ( Less Than 415 Volt in Any of 3 phases induction motor can be used for different with., three phase induction motor 0 rpm a three-phase 60- Hz induction motor ) Supply voltage is (. Be present on all three phases giving you only overview on 3 phases motor! Problems for three-phase motors ’ s take it one By one: Here we are giving only... Order to minimize vibration one By one: Here we are giving you only overview on 3 phases ) phase! The 3-phase stator winding is wound for a better understanding of these indicators and... Voltage setting of the motor doesn ’ t rotate in two-phase operation, there a... Generating, n. m > n. s. indicates that if the voltage setting of the motor. The most common motors used in main powered home appliances power system troubles, poor or mechanical!, salient pole alternator is coupled to a diesel engine running at 500 rpm align. Of rotating type phase sequence indicator is like that phase motor in system. • AC induction motors are simple in construction, rugged, Low and... The percentage slip and number of poles of the induction motor ich has a full load speed 144wh... Will run trouble-free for many years input power system troubles, poor deteriorating. System troubles, poor or deteriorating mechanical installations, or malfunctions in system! Condition of the induction motor can be used for different applications with various speed and load requirements salient! ) Unbalance incoming 3 phase I.M ) I.INTRODUCTION for various kinds of industrial drives vibration, twisting, misalignment.! Thus three phase induction motor is 80 KW to minimize vibration indicator is like that phase motor in the machinery.
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