A good trick I found on another forum. I'm thinking that the .8v windings are physically closer to the test/battery winding. Unmarked Leads. Prof. Steve discusses how to identify unmarked 9 lead (Delta connection) on a motor. They are generally held to a standard. If only a couple of leads are unmarked, you may be able to restore numbering by process of elimination. For more information, visit www.easa.com. As can be seen in Fig. Refer to Figure 1 for a detailed internal wiring diagram. Figure 6.28 shows a single-phase magnetic circuit containing four poles. I have had to reterminate motors where all the wires got chopped off and that gets a bit tougher but your situation should be easy. Sometimes you can find yourself in a difficult situation whereby the nameplate of the motor or wiring diagram is missing!! Thanks for waking me up to the thought that a motor lead identification procedure would work on a genset too. Re: Identifying Unmarked 6 Lead Single Phase Motor 10/01/2012 6:24 PM Perhaps I'm wrong, but I wouldn't have thought that would help him much, without identifying on the diagrams the points that represent the 6 leads. On the lower voltage rating, though, the external connection will be different for wye- and delta-connected units. If leads are numbered 1 to 9, the motor is typically rated for two voltages and could be designed with either a wye or delta connection. Thanks for waking me up to the thought that a motor lead identification procedure would work on a genset too. your own Pins on Pinterest A no-load current significantly above or below the ranges in Table I may indicate a connection error, or a winding error on rewound motors. Otherwise, it’s best to ask a service center for assistance, because they have reliable procedures for identifying leads. Single Phase Motors have a wide range of applications both domestic and industrial. Discussion Starter • #1 • Dec 15, 2011. MOTOR WIRING DIAGRAM 466703 12 Lead, Single Voltage, Wye Start – Delta Run or Part Winding Start Revised: 1/8/2014 NIDEC MOTOR CORPORATION ST. LOUIS, MISSOURI. No Jim, all 12 leads on this motor are black. Otherwise, it’s best to ask a service center for assistance, because they have reliable procedures for identifying leads. Discover (and save!) Twelve-lead induction motors will almost always run connected delta. If the diagram is lost, damaged, or ignored, you could find yourself dealing with a costly rewind. When half the poles are energized with intermittent DC, two more poles are created in the motor's iron core. Some machines will have 1-1, 2-2, 3-3, indicating a delta-run motor. If leads are numbered 1 to 12, the motor is typically rated for two voltages and could be used with a wye-delta starter at either voltage, or a part-winding starter for low voltage only. When a downscale deflection of the voltmeter needle. Name: 3 phase motor wiring diagram 12 leads – 3 Phase 6 Lead Motor Wiring Diagram Elegant Awesome 12 Lead 3 Phase Motor Wiring Diagram Electrical; File Type: JPG; Source: thespartanchronicle.com; Size: 1.35 MB; Dimension: 3229 x 2480; DOWNLOAD. Power Supply Test For single phase motors, the expected voltage is about 230V or 208V depending whether you are using the UK or America voltage system. The markings on the external leads of a motor sometimes become defaced or are removed, which makes it neces­sary to identify and mark them before the motor can be properly connected to the line. If leads are numbered 1 to 3 and 7 to 9, the winding is capable of part-winding start. Google will be a lot more useful to me now. T3–Orange . Rather than trying to figure out through hit and miss, you will be able to tell exactly which one is which. MOTORS . I would like to hook the motor up and test but have no idea what coil is what. The following tips apply to connections commonly encountered on machines with one speed at power frequency. Caution: The integrity of lead markings is only as good as the electrician who removed the motor from service and quality of the labeling materials at hand. For a single voltage rating, most six-lead machines are capable of wye-delta starting (and will run in delta). Units rated for single voltage may have 12 leads and be suitable for wye-delta or part-winding starts. Prof. Steve discusses how to identify unmarked 9 lead (Delta connection) on an electric motor. Prof. Steve shows how to identify unmarked 9 lead (WYE connection) on a motor. First identify combinations. The previous article presented the terminal wiring connection for a 12 leads star (wye) configured induction motor. 6.17, there are three sets of two leads that light together and one set of three leads. AC Motor Winding Resistance Test The motor draws excessive currents leads to damage of the windings. Nidec Motor Corporation trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office. Manufacturer’s nameplate for Delta connected 9-lead motor According to the table above, for a high-voltage connection, the electrician would connect L1 to lead #1, L2 to lead #2, L3 to lead #3, wire-nut 4 & 7 together, wire-nut 5 & 8 together, and wire-nut 6 & 9 together. When half the poles are energized with intermittent DC, two more poles are created in the motor's iron core. Suppose we have a new Induction motor without any marking of the leads, then we need to identify its polarity before using it. Check all 9 leads to look for pairs that have continuity. You will also a sensitive ohm meter. Also, since some part-winding start motors are numbered incorrectly as 1 to 6, remember the starting method you’re using. Equipment: Test Light or ohmmeter, 6 or 12 volt battery, low scale voltmeter and numbered lead labels. Identify Unmarked Leads in a 9 Lead WYE Connected Motor If you have ever tried to wire up a motor only to find that the motor winding leads in the motor have lost their identification number markings, you know how frustrating that can be. I think that by observing the polarity of the induced voltage you should be able to determine the start and finish of the windings. MT. Hi, I have a 12 lead motor here with un marked leads. When single-phase motors use lead colors instead of letter and number markings to identify the leads, the color assignment shall be determined from the following:* T1–Blue . If it was me right now I would take jrwb4gbm's advice and take it to a motor rebuild shop and have them identify the wires and mark them. If it fails to start , reverse one of the lower voltage windings. Also, if you have a power source equal to the lower voltage, connect three equal windings and attempt to start the motor. Identifying Leads of a Nine Lead Three Phase Motor I have a two speed motor 2950 rpm, 12 hp/ 3600 rpm, 15 hp duel voltage 3 phase motor. A good trick I found on another forum. Motor Wiring Diagram 12 Lead, Dual Voltage, Wye Start - Delta Run or Part Winding Start Motors designed by US Motors for Part-Winding Start may also be used for across the line starting using only the full winding connection. Hi, I have a 12 lead motor here with un marked leads. To connect the motor to its rated low voltage configuration, Fig-2 above shows an electrical schematic diagram of a delta configured 12 leads motor so connected for a 220 volts AC power supply. When a downscale deflection of the voltmeter needle. You will be able to find the layout one google. If you locate 3 pairs with continuity and one combination of 3, this is a … identifying unmarked motor leads. There at one time was printing on the leads but now unledgeable. I followed this description. Sometimes the motor itself is unaccessible like the case of bore hole pumps. While three-lead connections are the most straightforward, always check the direction of rotation before finalizing the motor installation, regardless of the lead quantity. The magnetic lines of force of these poles will cut the conductors of… Generally, a 12 lead motor is a dual voltage motor. This article will address lead identification of three-phase motors with 9 leads, based on the premise that none of the leads are marked. When I switched my meter to my good meter with more of a decimal point ... http://www.ewelectricinc.com/cms/images/12_lead_connections[1].pdf, http://www.naemotors.com/wp-content/...on-Diagram.pdf, http://catalog.wegelectric.com/img/Wiring_Diagrams.pdf, http://apps.motorboss.com/connections/466703.pdf, Innovative solutions to dealing with NFPA 70E, Currently Active Users Viewing This Thread: 1. Before proceeding, it is a good idea to check the motor for grounds. They have two windings for Starting and Running purposes. 12 leads 3 phase high volts delta connected wiring configuration diagram electrical schematic diagram of a delta configured 12 leads motor so connected A lternatively, discover how to power your home with Solar and Wind Energy! If a multimeter shows continuity between leads 7, 8, and 9, the machine is wye-connected (see Fig. The service center can also help with unconventional numbering or cross-referencing IEC and NEMA numbering. Nidec Motor Corporation trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office. Identifying unmarked wires 12 lead dual voltage motor Delta High Voltage . On machines rated for two voltages, the wye connection is for the high voltage; the delta connection is for the low voltage. • Low-voltage DC source (6- or 12-volt battery) • Low-scale DC voltmeter (must be analog) Numbered lead labels The motor must be assembled (the rotor is needed to complete the magnetic circuit). I was previledged to know an old Motor Rewind Man. MOTOR WIRING DIAGRAM 466703 12 Lead, Single Voltage, Wye Start – Delta Run or Part Winding Start Revised: 1/8/2014 NIDEC MOTOR CORPORATION ST. LOUIS, MISSOURI. This article introduces a set of proce­dures for identifying unmarked leads of 6-lead motors with 1 or 2 wind­ings. Identifying unmarked wires 12 lead dual voltage motor Delta High Voltage LIVE PLC Questions And Answers ... Identifying unmarked wires 12 lead dual voltage motor Delta High Voltage. † All non-Nidec Motor Corporation marks shown within this website are properties of their respective owners. If the external connection information isn’t available, ask your local service center for assistance, especially if several lead tags are missing or there are multiple nameplate speed ratings at power frequency. Star config for one voltage and Delta for the other. Ive looked at electrical handbooks but read nothing of the procedure for identifying which is which. The other lead is #6. Chuck Yung EASA Technical Support Specialist One frequent request of EASA’s technical support staff is for help in identifying unmarked motor leads. Unmarked Leads. mode tart run wye double delta (extended delta) 1.2 1.3 3 open together nema nomenclature—9 leads wye connected (low voltage only) motor leads 1 2 3 9 nema and 'ec nomenclature—12 leads single voltage or low voltage of dual-voltage motors iec wi/ v5v2 vi nema iec 12 1 9/\4 nema 31 wi,v2 ui 85 vi,u2 7,12 u5,w6 8,10 v5,u6 9,11 w5,v6 He passed...I Still need knowledge. By Mike Howell, Electrical Apparatus Service Association (EASA). Dec 30, 2015 - This Pin was discovered by Steve. You will be able to find the layout one google. Special Note: Motors often come from rewind shops with only three leads exposed ("A-phase", "B-phase", and "C-phase" or 1, 2, & 3). How do I identify unmarked motor leads on a 6-lead, three-phase 100HP 460 volt pump motor . This article introduces a set of proce-dures for identifying unmarked leads of 6-lead motors with 1 or 2 wind-ings. The highest resistance is the S (start) terminal of the compressor motor. Google will be a lot more useful to me now. Capacitor start and Run motor. If leads are numbered 1 to 6, the winding can usually be connected wye or delta. I agree that no help was found here, but to ID unmarked leads on a three phase 12 lead motor is tough, its not in the electrical handbook. Damage will occur if the motor is operated with load for more than 2 seconds on part-winding without transition to full winding. 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The old Simpson 260 positive deflection on one of the leads show leakage the! Thanks for waking me up to the test/battery winding let ’ s support.
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