Three phase induction motors are one of the most popular electric motors commonly found in processing plants or any manufacturing concern. No matter how urgent the problem and motor failure can cause some very urgent problems always develop a plan of attack before you start repair work. 2 DC Motors General Description The products described in this publication are designed specifically for use on rectified power. From the schematic on the previous page you should have read 120 volts at terminals X1 and X2. DC Motors: Maintenance & Troubleshooting is part two of the DC Motors two-part training series. Before you start using your new power pack, please ensure that you read carefully and understand these owner’s instruction and make sure that you always operate this equipment in a safe manner. The frequency of routine service varies widely between applications. 2. H��W�n�F}�W�#���^In���H7,�(ܠ���̖"���~}g��$;$Ey�x? <]>> Got a motor down? �ꇆ��n���Q�t�}MA�0�al������S�x ��k�&�^���>�0|>_�'��,�G! They provide the most surface contact since they are worn in. Verify that ambient does not exceed motor’s nameplate value. Because DC motors rely on brushes and many problems can arise from the brushes, maintenance should be conducted on a regular basis to check on the condition of your motors. DC motor fault zone analysis is a vital part of any DC motor maintenance program. The squirrel cage brand is the most popular and they perform various tasks wherever they are applied. Though you might try to do some of the troubleshooting with the drive and/or motor powered off, it's likely that you will have to do most of the testing with the power on. Typical inspections when troubleshooting DC motor problems or doing preventative maintenance. Motor Trouble-Shooting Chart 10/13/00 (continued) Motor may have too much endplay. ��78'�ro���c�� Ů��xݜ�6��Ɂ];"��wYvja���.E�{"�/��F$��(�#�Ѿ�����Zj�P��.yp��&��Ҷ�1HUo��� �%��W$����Zd�g��RO�˧U�2��(hԣ-�VI�o�tV5���i��)�m��O��&����S{��Y�ӣ����$-�j[�S#Ȋxi���K����;S�Y����K��˃��º���H$�p�bݕچ����X�5z�}\� �(K�>s�jph��b�$Rm�:Z>;xL1 sc�}�Ў�z�!�=��Mc Small DC motors are used in tools, toys, and appliances. The basic testing equipment you will need to troubleshoot DC motors in the field includes: Megohmmeter AC voltmeter DC clamp–on ammeter Ohmmeter DC voltmeter Tachometer Find out if the failed motor was: 1. • Check for voltage between the battery negative stud and red wire on motor harness pigtail. G�J��pz,G�S�� ��.M]p�qC=�;1�$q�s���N�i�`$zX9�{��c��PL!��1�U�|�FÅnB�E��p;�C͆�Fg��)-��Fg���>S��`T'��8��L���u�֫�NWqR[Ы�Ʊk��캨�b_f������x��إp8�]_��G�aR���H���GM"�ᾴu���+wEa��T��������聽;k��[�FIvLF w85���/� ��� A DC Motor „Without mechanical Brushes and Commutator „ Permanent Magnet Rotor ... Infinity Troubleshooting Guide •Example: Inducer Motor –Use Troubleshooting Guide –Check voltages •Line, PW and Feedback voltages. Always keep hands and clothing away from moving parts. Check the brush length. 0000005768 00000 n Then conduct resistance, fuse, and motor tests to help pinpoint the cause … Gather up any background material you may have on hand and then use your senses to inspect the site. If the motor … ... Brushes and Commutators (DC Motors) 1. 0000000750 00000 n Insulation Spot Test An insulation spot test is an insulation resistance test that can be used to verify the condition of the insulation over the life of the motor. How to Troubleshoot 3 Phase AC Motors. 0000060249 00000 n 0000001628 00000 n 609 0 obj<>stream The meter's screen should indicate a low resistance (somewhere between 10 and 30 ohms), but if it reads an infinite ohms or an open circuit you should rotate the end shaft of the motor. Hands-on Kit. trailer Rotary Converter Armature Showing Commutator And Slip Rings. N'��)�].�u�J�r� Check the outside of the motor. Starting switch may be defective, preventing the motor from coming out of start winding. Voltage to motor is too low. Disconnect power to the motor before performing service or maintenance. DC and Brushless motors have similar curves—low speed and high torque—but Brushless motors dramatically exceed the torque levels of all other motor options at similar frame sizes. 0000053289 00000 n H��Wˎ����gL�d�I�j����|0�`7v�ZX���wD�QU=}2te���w�����?���ŻҢ�2��.�^�} �7wy @�iH������}���2�G~��N�����.��_/19����j(P��d����������w߯��y�{�^�X�{���O�������{nmӧ��Ҷ���9���ӏ�_�r����o�Uۚ���Ⴄ̓\�-4��5n!�i#����OG�]#� f_��Hw��6�� When a current-carrying conductor is placed in a magnetic field, it experiences a torque and has a tendency to move.. DC motors were the first form of motor widely used, as they could be powered from existing direct-current lighting power distribution systems. ��B�B�j��B̛�9l VF�4�)^q�l���VK�����=7��j.��!��0`��&Og H���yTSw�oɞ����c [���5la�QIBH�ADED���2�mtFOE�.�c��}���0��8�׎�8G�Ng�����9�w���߽��� �'����0 �֠�J��b� Check the face of the brushes- it should be shiny or polished which will indicate good contact. Some of its common problems include failure to start, motor overheating, noise, and vibration. 0000005376 00000 n H�b``�f``�� ��� � bI(f`c��.��Z0��C[C����&0T:3��2p�2�/1ޠ�� խ���+��� � ��� endstream endobj 35 0 obj 89 endobj 9 0 obj << /Type /Page /Parent 2 0 R /Resources 10 0 R /Contents [ 15 0 R 17 0 R 19 0 R 21 0 R 23 0 R 26 0 R 28 0 R 30 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 10 0 obj << /ProcSet [ /PDF /Text ] /Font << /F1 24 0 R /F2 11 0 R >> /ExtGState << /GS1 32 0 R /GS2 33 0 R >> /ColorSpace << /Cs5 12 0 R /Cs9 13 0 R >> >> endobj 11 0 obj << /Type /Font /Subtype /Type1 /Encoding /WinAnsiEncoding /BaseFont /Helvetica-Bold >> endobj 12 0 obj [ /CalRGB << /WhitePoint [ 0.9505 1 1.089 ] /Gamma [ 2.22221 2.22221 2.22221 ] /Matrix [ 0.4124 0.2126 0.0193 0.3576 0.71519 0.1192 0.1805 0.0722 0.9505 ] >> ] endobj 13 0 obj [ /Separation /PANTONE#20307#20CV 12 0 R 31 0 R ] endobj 14 0 obj 2095 endobj 15 0 obj << /Filter /FlateDecode /Length 14 0 R >> stream 2 This review may reveal on-going problems that are both integral to the motor itself as well as external conditions (e.g., overloads, unbalances, misapplications) that are adversely affecting the motor’s normal operating condition. 4. Motor, Gearbox and Control Comparison Charts. 3. Operating successfully for a period of time before failing; or if it was 2. Discharge all capacitors before servicing motor. Troubleshooting problems on your AC motor is relatively straightforward, and providing you have reasonable do-it-yourself abilities, repairing it is not too difficult. The DC Motor Troubleshooting Trainer, H-113. IMPORTANT Thank you for purchasing this brand new Eagle Hydraulic Components® power pack ! 2 DC Motors General Description The products described in this publication are designed specifically for use on rectified power. 0000006034 00000 n endstream endobj 589 0 obj<>/Outlines 24 0 R/Metadata 74 0 R/PieceInfo<>>>/Pages 73 0 R/PageLayout/OneColumn/OCProperties<>/StructTreeRoot 76 0 R/Type/Catalog/LastModified(D:20090224210712)/PageLabels 71 0 R>> endobj 590 0 obj<>/PageElement<>>>/Name(HeaderFooter)/Type/OCG>> endobj 591 0 obj<>/Font<>/ProcSet[/PDF/Text]/Properties<>/ExtGState<>>>/Type/Page>> endobj 592 0 obj<> endobj 593 0 obj[/ICCBased 603 0 R] endobj 594 0 obj<> endobj 595 0 obj<> endobj 596 0 obj<>stream 3 After a service history review, a visual inspection should be performed to identify any obvious wear, blo… Because of the concealed nature of these motors, it can be highly difficult to complete any repairs or maintenance on them without having to pull whatever it is powering apart. The widespread use of motors in fields ranging from manufacturing to household applications means that downtime due to a malfunctioned motor can result in a great loss of productivity. A capacitor consists of two metal, parallel plates encased within a plastic exterior. startxref ���"�x�q�{y���>ޑlF����O{�����,C���u��ߨ���e�V���ߴ�8y(ܸ3�^N//�R�s�w��.0lzg>��M����#L����y?�خ*���� �fb\��V�{X�ƽ����=IJ���=�]`�Q؄�c���P��d��yt}?mM�V��ٔ$��V�C�e��P�oKo�*�v�pa�x+�%L�R�Hf�w�et�Ʃ����'v�H�i�.��!/�F(H�H��pGӢ�;{��C^�q���S�;u�D�WVj4KT�P�DѰN�`6���Th�J� $����ñi%8:4�j. Black spots on the collector rings must be removed by rubbing lightly with fine sandpaper. An electric motor is used for producing mechanical energy in various applications. In brief, a D.C. motor maintenance program (Table 1) begins with reviewing a motor’s service history. {f��eg��͛����;������9Lf�[ For example, the motor curve illustrated in Figure 1 was created using a rapid test on a motor dynamometer. 0000005990 00000 n xref • If no voltage is present, then check that all motor harness and control box plug connections are tight and in place. Principle of DC Motor. endstream endobj 597 0 obj<> endobj 598 0 obj<> endobj 599 0 obj<> endobj 600 0 obj<> endobj 601 0 obj<> endobj 602 0 obj<> endobj 603 0 obj<>stream 0000001787 00000 n Replace switch. Gather up any background material you may have on hand and then use your senses to inspect the site. The course teaches students to identify motor malfunctions by recognizing problematic symptoms and applying proven methods in correcting these problems. Check that the spring tension on all the brushes are about equal. @}2ضj�:+����*5�/�l�4�����W�� y� �27n̺x�8�ٺ[�Ӱ9+�����9�}�WsW�,aG�6C���(K�:��HY����'Y� To test your DC motor, touch the leads of the ohmmeter to the leads of the motor. If there is an imbalance of more than 10% between any of the phases, the reasons could be several, which must be located and set right immediately to avoid further mishaps. Installed recently. With drives and motors, there are a few common problems that application engineers tend to see the most. 0000002631 00000 n Motor fails to start upon initial installation. Below is an overview of the most common problems and the fixes to get your drive and motor working properly. Your DC motor is not working? As a result these motors are less prone to malfunctions and tend to operate for many years. 0000002880 00000 n %PDF-1.3 %���� Check the motor brushes are moving freely when disassembling. Scenario is the motor does not start when the start button is pressed. Regular inspections prioritizing these three goals, and adequate maintenance work, will ensure that DC motor units perform reliably in the long term. ��w�G� xR^���[�oƜch�g�`>b���$���*~� �:����E���b��~���,m,�-��ݖ,�Y��¬�*�6X�[ݱF�=�3�뭷Y��~dó ���t���i�z�f�6�~`{�v���.�Ng����#{�}�}��������j������c1X6���fm���;'_9 �r�:�8�q�:��˜�O:ϸ8������u��Jq���nv=���M����m����R 4 � Visual inspec-tion and electrical testing of the armature and fields give the maintenance personnel an under-standing of the condition of the motor. Maintenance and Troubleshooting of Electric Motors Reliance Electric Posted 1-10-05 Motor Maintenance - SCHEDULED ROUTINE CARE Introduction The key to minimizing motor problems is scheduled routine inspection and service. By regularly examining your commutators, you can prolong the life of your DC motors by preventing any long term damaging problems or catastrophic failures. As shown in Figure 1, an AC drive consists of three sections: rectifier, DC link or DC bus, and inverter. 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