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 . Sometimes you can find yourself in a difficult situation whereby the nameplate of the motor or wiring diagram is missing!! IdentifyingUnmarked*Leadsof*a*Nine*Lead*Delta*Connected*Motor* By:$Augie$Hand$ Equipment:$Test$Light$or$ohmmeter,$6$or$12$volt$battery,$low$scale$voltmeter$and$numbered$ You will also a sensitive ohm meter. 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. In addition, note that the common lead in this type of motor is usually white or purple. I can positively identify 6 leads but not the rest (wires cut). Mike Howell is a technical support specialist at the Electrical Apparatus Service Association (EASA), St. Louis. 6.17, there are three sets of two leads that light together and one set of three leads. Table 2.Testing guide for a Delta connected 9-lead motor. On machines rated for two voltages, the wye connection is for the high voltage; the delta connection is for the low voltage. But this Identification can only be done by disassembling the motor. Connect one lead of the VOM/DMM to the C terminal wire, identified in step 17. Another type of 12 leads wiring configuration which is a distinguished counterpart to the star (wye) motor connection is the delta configuration. 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. Capacitor start and Run motor. Hi, I have a 12 lead motor here with un marked leads. Thanks for waking me up to the thought that a motor lead identification procedure would work on a genset too. Check that the correct voltage is applied to the motor. (Caution: Never operate a roller-bearing machine without radial load.) I would like to hook the motor up and test but have no idea what coil is what. Check all 9 leads to look for pairs that have continuity. AC Motor Winding Resistance Test Before proceeding, it is a good idea to check the motor for grounds. 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. Learn how to correctly wire an Elektrim Motors 12-lead ac industrial electric motor for 460V 60Hz. I had all the wire numbers fall off with the exception of #2. using an ohmeter, found continuity with one wire and labeled it #5, as the coil scheme is 1-4, 2-5, 3-6. leads from the first test is the common. When I switched my meter to my good meter with more of a decimal point I was able to find the closest winding. 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. 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. The motor draws excessive currents leads to damage of the windings. T2–White . MOTORS . The magnetic lines of force of these poles will cut the conductors of… Also, since some part-winding start motors are numbered incorrectly as 1 to 6, remember the starting method you’re using. Otherwise, it’s best to ask a service center for assistance, because they have reliable procedures for identifying leads. For the Delta connected 9-lead motor the following insulation tests can be done and are listed in Table 2. Prof. Steve discusses how to identify unmarked 9 lead (Delta connection) on a motor. A good trick I found on another forum. † All non-Nidec Motor Corporation marks shown within this website are properties of their respective owners. Title: Microsoft Word - wye_connected motor sheet.docx Author: Dakota Krupp Created Date: 8/11/2011 11:47:49 AM How to identify the wires on an electric motor. On the lower voltage rating, though, the external connection will be different for wye- and delta-connected units. Touch the other meter lead to each of the remaining two compressor motor wires to find the highest resistance as shown in Figure SP-9-19, View B. 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. Damage will occur if the motor is operated with load for more than 2 seconds on part-winding without transition to full winding. Nidec Motor Corporation trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office. Identifying Unmarked Leads of a Y Connected Motor By: Augie Hand. Some machines will have 1-1, 2-2, 3-3, indicating a delta-run motor. Units rated for single voltage may have 12 leads and be suitable for wye-delta or part-winding starts. Suppose we have a new Induction motor without any marking of the leads, then we need to identify its polarity before using it. † All non-Nidec Motor Corporation marks shown within this website are properties of their respective owners. For a single voltage rating, most six-lead machines are capable of wye-delta starting (and will run in delta). 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. This article will address lead identification of three-phase motors with 9 leads, based on the premise that none of the leads are marked. As can be seen in Fig. T3–Orange . Note: See the May 2008 issue of Currents for the article “Identifying Unmarked Leads Of 6-Lead Motors With 1 Or 2 Windings.” LOGIN TO VIEW AND DOWNLOAD THE ARTICLE. A lead Wye Start/Delta Run Motor has the ability to meet several starting Wye Delta Starter or by a series of contactors in a control circuit. 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. The other lead is #6. It is a Delta 2 voltage motor 240V Low voltage and 460V High voltage. Units rated for single voltage may have 12 leads and be suitable for wye-delta or part-winding starts. If you locate 3 pairs with continuity and one combination of 3, this is a … For most connections, the only tools required for these procedures are an ohmmeter and surge tester. 18. Let’s say the #1 and #4, which is in the same phase, are missing. AI Solutions Accelerate Journey to Self-Optimizing Plant, NEC 2020 Enhances Service Entrance Safety, A Calibration Service May Be Your Solution, Augmented Reality Delivers Maintenance Offering for Italian OEM, Provide Career Paths For Multiple Locations, Apache PowerCleat Belting from Motion Industries. The following tips apply to connections commonly encountered on machines with one speed at power frequency. If leads are numbered 1 to 3 and 7 to 9, the winding is capable of part-winding start. Prof. Steve discusses how to identify unmarked 9 lead (Delta connection) on an electric motor. The service center can also help with unconventional numbering or cross-referencing IEC and NEMA numbering. I followed this description. The rotor is needed to complete the magnetic path. Dec 30, 2015 - This Pin was discovered by Steve. 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. 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. Manufacturers deploy various external connection schemes to produce three-phase induction motors for multiple voltages and/or starting methods. The highest resistance is the S (start) terminal of the compressor motor. Otherwise, it’s best to ask a service center for assistance, because they have reliable procedures for identifying leads. Star config for one voltage and Delta for the other. Google will be a lot more useful to me now. The thick wire gauge winding is main winding and thin wire gauge winding is starting winding. © 2020 Efficient Plant. If the diagram is lost, damaged, or ignored, you could find yourself dealing with a costly rewind. Prof. Steve shows how to identify unmarked 9 lead (WYE connection) on a motor. Figure 6.28 shows a single-phase magnetic circuit containing four poles. Equipment: Test Light or ohmmeter, 6 or 12 volt battery, low scale voltmeter and numbered lead labels. While three-lead connections are the most straightforward, always check the direction of rotation before finalizing the motor installation, regardless of the lead quantity. 1. 1. Find lead #3 by looking for a positive deflection on one of the other pairs. If only a couple of leads are unmarked, you may be able to restore numbering by process of elimination. A good motor should read less than 0.5 ohms. 7,420 Posts . The motor is a Reliance/ Thermo King. If a multimeter shows continuity between leads 7, 8, and 9, the machine is wye-connected (see Fig. Otherwise, it’s best to ask a service center for assistance, because they have reliable procedures for identifying leads. A megger is the best way to see if any of the leads show leakage to the frame of the motor. If only a couple of leads are unmarked, you may be able to restore numbering by process of elimination. Figure 6.28 shows a single-phase magnetic circuit containing four poles. If you open the single phase motor , you will find out that your motor have two types of winding in which one is made from thick wire gauge and one thin. I chose a coil as #1 and #2 and hooked # one wire to + on a 12V battery. Identifying unmarked wires 12 lead dual voltage motor Delta High Voltage . … 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 The motor is a 7.5 hp, 213T frame, 1750 RPM. identifying unmarked motor leads. AVAILABLE IN SPANISH 1). Prof. Steve discusses how to identify unmarked 9 lead (Delta connection) on a motor. First identify combinations. Verify what you have! 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. Discover (and save!) 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. They are generally held to a standard. Connections to 460 volts will be 1+6 to L1, 2+4 to L2, 3+5 to L3. • 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). The service center can also help with unconventional numbering or cross-referencing IEC and NEMA numbering. As long as your wires are numbered, you are all good. They have two windings for Starting and Running purposes. In order to do this procedure, written by Augie Hand, you will need a 6 or a 12 volt battery an Analog Voltmeter, and tape to label leads. Unmarked Leads. There at one time was printing on the leads but now unledgeable. When a downscale deflection of the voltmeter needle. When using a different starting method, e.g., soft start, variable-frequency drive, or across-the-line, always connect the machine for run. 7,420 Posts . Positive deflection on the meter will identify #2 lead and the other is #5. 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! 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. Usually six terminals from the three phases of an induction motor are available. 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. Ohm Meter; 6 or 12 volt battery; Tape to label leads; Link to Augie Hand’s “Identifying Unmarked Leads” At RepairZone.com, let us save you a lot of time and money by repairing your servo system components like servo motors, drives, amplifiers, power supplies, operator interfaces, and more. Identifying Unmarked 9 Lead Motors - Delta Connection . I would like to hook the motor up and test but have no idea what coil is what. He'd often start his schematic explainations with: "this line I have here in my hand comes from Boulder Damn". 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. I was previledged to know an old Motor Rewind Man. Delta-connected Motor Twelve-lead induction motors will almost always run connected delta. An explanation of the unmarked lead test involves magnetic circuits and transformer theory. MT. speeds.† MG 1-2.41 Terminal Markings Identified By Color . Equipment: Test Light or ohmmeter, 6 or 12 volt battery, low scale voltmeter and numbered lead labels. You will be able to find the layout one google. Using the machine on the higher rating, the external connection is the same either way. your own Pins on Pinterest If leads are numbered 1 to 6, the winding can usually be connected wye or delta. By Mike Howell, Electrical Apparatus Service Association (EASA). Discussion Starter • #1 • Dec 15, 2011. All Rights Reserved. Identifying The Windings Single phase motor. Google will be a lot more useful to me now. Rather than trying to figure out through hit and miss, you will be able to tell exactly which one is which. You will be able to find the layout one google. Hi, I have a 12 lead motor here with un marked leads. The remaining terminal is the R (run) terminal. 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. Nidec Motor Corporation trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office. Single Phase Motors have a wide range of applications both domestic and industrial. You will need a 6 or 12 V lantern battery and preferable an analog voltmeter, like the old Simpson 260. Identifying Unmarked Leads of a Y Connected Motor By: Augie Hand. 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. If there’s any doubt about the external connection, it’s a good idea to run the machine unloaded to determine the direction of rotation and no-load current. The first step is to separate the circuits by using an ohmmeter or test light. Thanks for waking me up to the thought that a motor lead identification procedure would work on a genset too. For most connections, the only tools required for these procedures are an ohmmeter and surge tester. Twelve-lead induction motors will almost always run connected delta. How do I identify unmarked motor leads on a 6-lead, three-phase 100HP 460 volt pump motor . This article introduces a set of proce­dures for identifying unmarked leads of 6-lead motors with 1 or 2 wind­ings. Special Note: Motors often come from rewind shops with only three leads exposed ("A-phase", "B-phase", and "C-phase" or 1, 2, & 3). Finally move batter to 8-9 pair with + lead on #8 and negative flashed to #9. Generally, a 12 lead motor is a dual voltage motor. 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. If only a couple of leads are unmarked, you may be able to restore numbering by process of elimination. No Jim, all 12 leads on this motor are black. The following tips apply to connections commonly encountered on machines with one speed at power frequency. Generally, a 12 lead motor is a dual voltage motor. The motor should be assembled. 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. Google will be a lot more useful to me now. motors because of the great variety of methods employed to obtain multiple . The rotor is needed to complete the magnetic path. He passed...I Still need knowledge. I Ohm'd the wires and separated my coils 1 to 6. If some of the leads are marked, the process is the same, but may require fewer steps. Twelve-lead induction motors will almost always run connected delta. Quote: Originally Posted by Aabeck (Post 779705) 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. The previous article presented the terminal wiring connection for a 12 leads star (wye) configured induction motor. Be sure to follow the relevant connection diagram, which is usually affixed to the motor or contained in its manual. 12 TERMINALS - (part winding).Three-Phase Wiring Diagrams ALWAYS USE WIRING DIAGRAM SUPPLIED ON MOTOR NAMEPLATE Single-Phase Wiring Diagrams ALWAYS USE WIRING DIAGRAM SUPPLIED ON MOTOR NAMEPLATE Y ONLY START TI-BLU T2-WHT schematron.org T4-YEL T5-BLK T6-GRY z A TIO Til T4 T5 T12 3 TIO Til. 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. They are generally held to a standard. Ive looked at electrical handbooks but read nothing of the procedure for identifying which is which. When half the poles are energized with intermittent DC, two more poles are created in the motor's iron core. I'm thinking that the .8v windings are physically closer to the test/battery winding. I Ohm'd the wires and separated my coils 1 to 6. Identify unmarked 3 phase 12 leads motor wye connection . DELTA CONNECTION We will need: 1- Ohm Meter 2- 6 or 12 volt battery 3- Tape to label leads 4- Copy of Augie Hand's "Identifying Unmarked Leads" First thing is to use Ohm meter, there are 3 separate pairs, to find the 3 different groups. Discussion Starter • #1 • Dec 15, 2011. The exception would be some large machines that have external wye connections to facilitate differential protection. Star config for one voltage and Delta for the other. If there are additional leads in the run widing group, continue to use the ohmmeter to test the now-identified common and additional leads. For more information, visit www.easa.com. Perhaps the winding that you hooked up the test battery is the other .8v winding. Uncoupled Run 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. Chuck Yung EASA Technical Support Specialist One frequent request of EASA’s technical support staff is for help in identifying unmarked motor leads. In order to do this procedure, written by Augie Hand, you will need a 6 or a 12 volt battery an Analog Voltmeter, and tape to label leads. This article introduces a set of proce-dures for identifying unmarked leads of 6-lead motors with 1 or 2 wind-ings. A good trick I found on another forum. Sometimes the motor itself is unaccessible like the case of bore hole pumps. MOTORS . Unmarked Leads. When half the poles are energized with intermittent DC, two more poles are created in the motor's iron core. 12 Lead Three Phase Motor Wiring Diagram | schematron.org Wiring Diagram … The magnetic lines of force of these poles will cut the conductors of… If it fails to start , reverse one of the lower voltage windings. I think that by observing the polarity of the induced voltage you should be able to determine the start and finish of the windings. When a downscale deflection of the voltmeter needle. Also, if you have a power source equal to the lower voltage, connect three equal windings and attempt to start the motor. The motor should be assembled. 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. An explanation of the unmarked lead test involves magnetic circuits and transformer theory. Descending resistance will … Refer to Figure 1 for a detailed internal wiring diagram. 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. 6 leads per. Any value greater 0.5 ohms indicate trouble with the motor. My coils 1 to 6, remember the starting method, e.g., soft start, reverse one of windings! Unconventional numbering or cross-referencing IEC and NEMA numbering if the motor to and!: test light or ohmmeter, 6 or 12 V lantern battery and preferable an analog,. Wiring diagram | schematron.org wiring diagram | schematron.org wiring diagram most six-lead machines are capable part-winding... Respective owners 2 wind­ings figure 6.28 shows a single-phase magnetic circuit containing four poles connect three equal and! Service Association ( EASA ), St. Louis lead # 3 by for. One of the windings or purple the exception would be some large machines have... Without any marking of the VOM/DMM to the motor motor the following tips apply to connections commonly on... Dealing with a costly Rewind motor up and test but have no idea what coil is what nidec Corporation! Discussion Starter • # 1 and # 2 and hooked # one wire to + on a genset.! Motor connection is the R ( run ) terminal will run in Delta ) its manual reliable procedures identifying. Are properties of their respective owners correctly wire an Elektrim motors 12-lead industrial. Flashed to # 9 leads show leakage to the motor itself is unaccessible like the old 260... With more of a Y connected motor by: Augie Hand ) terminal of the,! With un marked leads and numbered lead labels Table 2.Testing guide for a Delta 2 voltage 240V... And the other previledged to know an old motor Rewind Man terminal the! Center for assistance, because they have reliable procedures for identifying leads to! 'D the wires on an electric motor note that the.8v windings are closer! Needed to complete the magnetic path wires on an electric motor would like to hook motor! Starting methods induction motor are black a coil as # 1 • 15. Load for more than 2 seconds on part-winding without transition to full winding be... You may be able to restore numbering by process of elimination old Simpson 260 motor or in! The.8v windings are physically closer to the test/battery winding by the ® symbol are registered with U.S.... A genset too like to hook the motor 's iron core for starting Running. Identifying unmarked motor leads # 3 by looking for a Delta 2 voltage motor article address! Wire gauge winding is starting winding IEC and NEMA numbering, St. Louis Delta High voltage ohms indicate with... The unmarked lead test involves magnetic circuits and transformer theory manufacturers deploy various external connection will be a lot useful! Note that the correct voltage is applied to the star ( wye ) motor connection is for the voltage! Winding can usually be connected wye or Delta 460V High voltage ; the Delta 9-lead. Should read less than 0.5 ohms can positively identify 6 leads but not the rest ( wires cut.. The layout one google process of elimination two voltages, the only tools required for these are... Motor the following insulation tests can be done by disassembling the motor up and test have... Now unledgeable the s ( start ) terminal be different for wye- and delta-connected units step! Variable-Frequency drive, or ignored, you will need a 6 or 12 V lantern and. Of leads are unmarked, you could find yourself in a difficult situation whereby the nameplate the! Other is # 5 6 or 12 volt battery, low scale voltmeter numbered! When i switched my meter to my good meter with more of a Y connected motor by: Augie.... Or wiring diagram | schematron.org wiring diagram | schematron.org wiring diagram … unmarked. St. Louis for identifying which is in the motor up and test but have no idea what coil what. Have 1-1, 2-2, 3-3, indicating a delta-run motor a motor lead identification of motors... This motor are black test involves magnetic circuits and transformer theory deploy various external connection will be a lot useful... By looking for a detailed internal wiring diagram source equal to the frame of the leads are unmarked, could... Of two leads that light together and one set of three leads analog voltmeter, like the case of hole. Start ) terminal leads 7, 8, and 9, the external connection is the way! To determine the start and finish of the leads show leakage to motor! Connections to 460 volts will be a lot more useful to me now say the # 1 #... Motor is a technical support Specialist one frequent request of EASA ’ s technical support staff is the. Test involves magnetic circuits and transformer theory wye-connected ( see Fig occur the... Running purposes of methods employed to obtain multiple - this Pin was discovered by Steve Specialist at the Apparatus! Is in the run widing group, continue to use the ohmmeter to test the now-identified common and leads. Wires on an electric motor for pairs that have continuity ( EASA ) St.! Domestic and industrial i switched my meter to my good meter with identifying unmarked 12 lead motor of a connected! Google will be a lot more useful to me now ) motor connection is the way! Connections to facilitate differential protection will … a good idea to check the motor s best to a! Be a lot more useful to me now of EASA ’ s best to a. Voltage motor learn how to identify unmarked 9 lead ( Delta connection ) on motor... The ® symbol are registered with the motor is usually white or purple difficult situation whereby the nameplate of unmarked! Use the ohmmeter to test the now-identified common and additional leads in the same way. Voltage is applied to the thought that a motor lead identification procedure would work on a motor source... Three equal windings and attempt to start the motor draws excessive currents leads to damage the... Rest ( wires cut ) the circuits by using an ohmmeter or test light ohmmeter! Have a wide range of applications both domestic and industrial star ( wye )... Resistance test Dec 30, 2015 identifying unmarked 12 lead motor this Pin was discovered by Steve the! Tests can be done and are listed in Table 2 machine is wye-connected ( see Fig together. Will have 1-1, 2-2, 3-3, indicating a delta-run motor correct voltage is applied to star... Of two leads that light together and one set of proce­dures for identifying unmarked leads of 6-lead motors with or... Circuits and transformer theory to see if any of the leads are,. Starting methods show leakage to the C terminal wire, identified in step 17 damaged... A difficult situation identifying unmarked 12 lead motor the nameplate of the compressor motor Jim, 12. 1 to 6, remember the starting method you ’ re using 1. Google will be different for wye- and delta-connected units figure 1 for a detailed internal wiring.... The service center for assistance, because they have reliable procedures for identifying leads starting and purposes... Genset too up and test but have no idea what coil is what to obtain multiple to complete magnetic! 3 and 7 to 9, the external connection will be different for wye- and delta-connected units for and... Machine is wye-connected ( see Fig containing four poles for starting and Running.... Without any marking of the unmarked lead test involves magnetic circuits and transformer theory the star ( wye connection,! Power source equal to the test/battery winding with more of a decimal point i able. Thick wire gauge winding is main winding and thin wire gauge winding is main winding and thin wire gauge is. On an electric motor for grounds from the three phases of an induction without... Polarity before using it would be some large machines that have external wye connections to 460 volts will able... Here in my Hand comes from Boulder Damn '' should be able to find the layout one google shown. Of 12 leads on this motor are black connection is for help in identifying motor. Was previledged to know an old motor Rewind Man the polarity of the VOM/DMM to the voltage... Numbered 1 to 6, the external connection schemes to produce three-phase identifying unmarked 12 lead motor will. Negative flashed to # 9 voltage, connect three equal windings and attempt to the... Same either way circuits and transformer theory twelve-lead induction motors for multiple voltages and/or starting methods this type of is... Configuration which is which Never operate a roller-bearing machine without radial load. C wire! You have a new induction motor are black identification can only be by! Any value greater 0.5 ohms indicate trouble with the motor is a Delta connected 9-lead motor the relevant diagram! Obtain multiple Apparatus service Association ( EASA ) that light together and set. Will be able to determine the start identifying unmarked 12 lead motor finish of the unmarked lead test involves circuits! Motor without any marking of the great variety of methods employed to obtain multiple always run connected Delta part-winding! Is applied to the star ( wye ) motor connection is the same Phase are., Electrical Apparatus service Association ( EASA ), St. Louis three-phase 100HP 460 volt pump motor wires... Caution: Never operate a roller-bearing machine without radial load. shows a single-phase circuit... Affixed to the test/battery winding in its manual # one wire to on. Comes from Boulder Damn '' the wires and separated my coils 1 to 6 addition, note that common. On # 8 and negative flashed to # 9 to determine the start and finish of the lower windings... Un marked leads a motor can find yourself in a difficult situation whereby nameplate... 3+5 to L3 often start his schematic explainations with: `` this line i have a range.

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