identifying unmarked 12 lead motor

Units rated for single voltage may have 12 leads and be suitable for wye-delta or part-winding starts. The remaining terminal is the R (run) terminal. All Rights Reserved. Identifying Unmarked 9 Lead Motors - Delta Connection . Discussion Starter • #1 • Dec 15, 2011. I was previledged to know an old Motor Rewind Man. 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. Manufacturers deploy various external connection schemes to produce three-phase induction motors for multiple voltages and/or starting methods. I would like to hook the motor up and test but have no idea what coil is what. 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. Let’s say the #1 and #4, which is in the same phase, are missing. Dec 30, 2015 - This Pin was discovered by Steve. Generally, a 12 lead motor is a dual voltage motor. Thanks for waking me up to the thought that a motor lead identification procedure would work on a genset too. If only a couple of leads are unmarked, you may be able to restore numbering by process of elimination. T2–White . Identifying The Windings Single phase motor. Hi, I have a 12 lead motor here with un marked leads. The rotor is needed to complete the magnetic path. Identifying unmarked wires 12 lead dual voltage motor Delta High Voltage . When a downscale deflection of the voltmeter needle. When half the poles are energized with intermittent DC, two more poles are created in the motor's iron core. They are generally held to a standard. There at one time was printing on the leads but now unledgeable. An explanation of the unmarked lead test involves magnetic circuits and transformer theory. 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. While three-lead connections are the most straightforward, always check the direction of rotation before finalizing the motor installation, regardless of the lead quantity. Another type of 12 leads wiring configuration which is a distinguished counterpart to the star (wye) motor connection is the delta configuration. Thanks for waking me up to the thought that a motor lead identification procedure would work on a genset too. Google will be a lot more useful to me now. Refer to Figure 1 for a detailed internal wiring diagram. Otherwise, it’s best to ask a service center for assistance, because they have reliable procedures for identifying leads. When I switched my meter to my good meter with more of a decimal point I was able to find the closest winding. The motor should be assembled. I'm thinking that the .8v windings are physically closer to the test/battery winding. When half the poles are energized with intermittent DC, two more poles are created in the motor's iron core. The magnetic lines of force of these poles will cut the conductors of… 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. 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. Prof. Steve shows how to identify unmarked 9 lead (WYE connection) on a motor. Sometimes you can find yourself in a difficult situation whereby the nameplate of the motor or wiring diagram is missing!! 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. They have two windings for Starting and Running purposes. 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. 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. Using the machine on the higher rating, the external connection is the same either way. Uncoupled Run Discover (and save!) Also, if you have a power source equal to the lower voltage, connect three equal windings and attempt to start the 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. Sometimes the motor itself is unaccessible like the case of bore hole pumps. If only a couple of leads are unmarked, you may be able to restore numbering by process of elimination. For most connections, the only tools required for these procedures are an ohmmeter and surge tester. 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. © 2020 Efficient Plant. Be sure to follow the relevant connection diagram, which is usually affixed to the motor or contained in its manual. your own Pins on Pinterest Positive deflection on the meter will identify #2 lead and the other is #5. It is a Delta 2 voltage motor 240V Low voltage and 460V High voltage. The motor draws excessive currents leads to damage of the windings. Identifying Unmarked Leads of a Y Connected Motor By: Augie Hand. Special Note: Motors often come from rewind shops with only three leads exposed ("A-phase", "B-phase", and "C-phase" or 1, 2, & 3). You will need a 6 or 12 V lantern battery and preferable an analog voltmeter, like the old Simpson 260. 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. 18. Nidec Motor Corporation trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office. Before proceeding, it is a good idea to check the motor for grounds. The motor should be assembled. 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. 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. MOTORS . 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. 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 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. 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. Descending resistance will … 7,420 Posts . Unmarked Leads. 1. 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 service center can also help with unconventional numbering or cross-referencing IEC and NEMA numbering. Find lead #3 by looking for a positive deflection on one of the other pairs. I would like to hook the motor up and test but have no idea what coil is what. The previous article presented the terminal wiring connection for a 12 leads star (wye) configured induction motor. Mike Howell is a technical support specialist at the Electrical Apparatus Service Association (EASA), St. Louis. You will be able to find the layout one google. As long as your wires are numbered, you are all good. 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. AVAILABLE IN SPANISH In addition, note that the common lead in this type of motor is usually white or purple. 1). Twelve-lead induction motors will almost always run connected delta. I Ohm'd the wires and separated my coils 1 to 6. Connections to 460 volts will be 1+6 to L1, 2+4 to L2, 3+5 to L3. Any value greater 0.5 ohms indicate trouble with the motor. Title: Microsoft Word - wye_connected motor sheet.docx Author: Dakota Krupp Created Date: 8/11/2011 11:47:49 AM The highest resistance is the S (start) terminal of the compressor motor. Identifying Unmarked Leads of a Y Connected Motor By: Augie Hand. Damage will occur if the motor is operated with load for more than 2 seconds on part-winding without transition to full winding. speeds.† MG 1-2.41 Terminal Markings Identified By Color . Units rated for single voltage may have 12 leads and be suitable for wye-delta or part-winding starts. When a downscale deflection of the voltmeter needle. leads from the first test is the common. For more information, visit www.easa.com. A megger is the best way to see if any of the leads show leakage to the frame of the motor. The other lead is #6. On machines rated for two voltages, the wye connection is for the high voltage; the delta connection is for the low voltage. Capacitor start and Run motor. First identify combinations. AC Motor Winding Resistance Test If the diagram is lost, damaged, or ignored, you could find yourself dealing with a costly rewind. Perhaps the winding that you hooked up the test battery is the other .8v winding. 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. As can be seen in Fig. Rather than trying to figure out through hit and miss, you will be able to tell exactly which one is which. Chuck Yung EASA Technical Support Specialist One frequent request of EASA’s technical support staff is for help in identifying unmarked motor leads. 6 leads per. The magnetic lines of force of these poles will cut the conductors of… 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$ Finally move batter to 8-9 pair with + lead on #8 and negative flashed to #9. The following tips apply to connections commonly encountered on machines with one speed at power frequency. • 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). Prof. Steve discusses how to identify unmarked 9 lead (Delta connection) on a motor. How to identify the wires on an electric 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. 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! How do I identify unmarked motor leads on a 6-lead, three-phase 100HP 460 volt pump motor . 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. Single Phase Motors have a wide range of applications both domestic and industrial. 1. 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. 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. 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 . 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. 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. They are generally held to a standard. I think that by observing the polarity of the induced voltage you should be able to determine the start and finish of the windings. If a multimeter shows continuity between leads 7, 8, and 9, the machine is wye-connected (see Fig. A good trick I found on another forum. Some machines will have 1-1, 2-2, 3-3, indicating a delta-run motor. Star config for one voltage and Delta for the other. MOTORS . But this Identification can only be done by disassembling the motor. Table 2.Testing guide for a Delta connected 9-lead motor. 7,420 Posts . Verify what you have! Check that the correct voltage is applied to the motor. 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. The first step is to separate the circuits by using an ohmmeter or test light. If it fails to start , reverse one of the lower voltage windings. motors because of the great variety of methods employed to obtain multiple . 12 Lead Three Phase Motor Wiring Diagram | schematron.org Wiring Diagram … Unmarked Leads. The rotor is needed to complete the magnetic path. T3–Orange . Otherwise, it’s best to ask a service center for assistance, because they have reliable procedures for identifying leads. If you locate 3 pairs with continuity and one combination of 3, this is a … Figure 6.28 shows a single-phase magnetic circuit containing four poles. A good trick I found on another forum. On the lower voltage rating, though, the external connection will be different for wye- and delta-connected units. Nidec Motor Corporation trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office. Discussion Starter • #1 • Dec 15, 2011. Also, since some part-winding start motors are numbered incorrectly as 1 to 6, remember the starting method you’re using. If some of the leads are marked, the process is the same, but may require fewer steps. By Mike Howell, Electrical Apparatus Service Association (EASA). 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. 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. 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. Twelve-lead induction motors will almost always run connected delta. 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. You will be able to find the layout one google. This article introduces a set of proce-dures for identifying unmarked leads of 6-lead motors with 1 or 2 wind-ings. An explanation of the unmarked lead test involves magnetic circuits and transformer theory. Hi, I have a 12 lead motor here with un marked leads. (Caution: Never operate a roller-bearing machine without radial load.) The exception would be some large machines that have external wye connections to facilitate differential protection. Delta-connected Motor The motor is a 7.5 hp, 213T frame, 1750 RPM. identifying unmarked motor leads. 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. 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. Usually six terminals from the three phases of an induction motor are available. Equipment: Test Light or ohmmeter, 6 or 12 volt battery, low scale voltmeter and numbered lead labels. Leads, then we need to identify unmarked 9 lead ( wye ) motor connection is the Delta )... The ohmmeter to test the now-identified common and additional leads machines that have external wye connections to differential... A couple of leads are unmarked, you may be able to tell exactly which one is which i. Technical support staff is for help in identifying unmarked leads of 6-lead motors with 1 or 2 wind-ings highest! The meter will identify # 2 lead and the other is #.! That none of the motor method you ’ re using EASA technical support Specialist one frequent request of EASA s! Proce­Dures for identifying leads suitable for wye-delta or part-winding starts the winding that you hooked up test! You are all good, if you have a new induction motor are black resistance is the R ( ). Iron core windings for starting and Running purposes voltages, the machine on the higher rating most! On a motor Jim, all 12 leads and be suitable for wye-delta or part-winding starts with! Needed to complete the magnetic path for two voltages, the winding is capable of wye-delta starting ( will! E.G., soft start, reverse one of the procedure for identifying leads to winding... The High voltage ; the Delta connection ) on a genset too exception would be some machines... Have a new induction motor without any marking of the great variety of methods employed to multiple! The induced voltage you should be able to find the closest winding and finish of the variety... Leads that light together and one set of proce­dures for identifying leads a distinguished counterpart to the thought that motor... Are properties of their respective owners shown within this website are properties of their respective owners white...: test light or ohmmeter, 6 or 12 V lantern battery and preferable an analog voltmeter, the... Config for one voltage and 460V High voltage type of motor is a support! Start, variable-frequency drive, or across-the-line, always connect the machine for run check all 9 leads, on! V lantern battery and preferable an analog voltmeter, like the old 260. Damn '' machines that have continuity connections, the only tools required for these are... This article introduces a set of three leads 1 for a Delta connected motor... Lead motor here with un marked leads resistance test Dec 30, 2015 - this Pin discovered. Part-Winding without transition to full winding article will address lead identification procedure work..., 6 or 12 V lantern battery and preferable an analog voltmeter, like the old Simpson 260 Corporation shown! The best way to see if any of the motor draws excessive currents leads to damage of windings! Me up to the frame of the lower voltage windings another type 12. Identification of three-phase motors with 9 leads, then we need to identify its polarity before using it Specialist the... Would like to hook the motor, continue to use the ohmmeter to test the common! High voltage from Boulder Damn '' use the ohmmeter to test the now-identified common and additional leads in motor... The test battery is the same either way Boulder Damn '' start his schematic explainations with: `` this i... Properties of their respective owners, then we need to identify its polarity before using it closest winding 1+6! Light or ohmmeter, 6 or 12 V lantern battery and preferable an analog voltmeter, like the old 260! I can positively identify 6 leads but not the rest ( wires cut ) or cross-referencing IEC and NEMA.... Pump motor website are properties of their respective owners hooked # one to... Equal windings and attempt to start, variable-frequency drive, or ignored, are! For pairs that have external wye connections to 460 volts will be a lot more useful me! Three Phase motor wiring diagram is missing! for multiple voltages and/or starting methods and set... Hook the motor draws excessive currents leads to damage of the induced voltage should... For identifying unmarked wires 12 lead motor here with un marked leads winding that you hooked up the battery. Common and additional leads applications both domestic and industrial the R ( )., three-phase 100HP 460 volt pump motor three-phase 100HP 460 volt pump motor registered with the.! As 1 to 6, remember the starting method you ’ re using of wye-delta starting ( and will in! More poles are created in the motor itself is unaccessible like the case bore. Genset too and miss, you may be able to find the layout google. On # 8 and negative flashed to # 9, then we need to identify unmarked lead! A Delta 2 voltage motor ignored, you are all good need a 6 or V! In its manual be 1+6 to L1, 2+4 to L2, 3+5 to.! Delta 2 voltage motor Delta High voltage continue to use the ohmmeter to test the now-identified and... One lead of the procedure for identifying which is usually affixed to the thought that a motor winding thin... On part-winding without transition to full winding of proce-dures for identifying leads dealing with a costly Rewind connect! Capable of part-winding start motors are numbered 1 to 6, the winding is capable of wye-delta starting ( will. Need to identify its polarity before using it to correctly wire an Elektrim motors 12-lead industrial! To restore numbering by process of elimination or ignored, you could find yourself in a difficult situation whereby nameplate. Jim, all 12 leads motor wye connection ) on a motor source equal to the motor for 460V.. The leads are numbered incorrectly as 1 to 6 is what center can help! Same either way here in my Hand comes from Boulder Damn '' chose a coil as # 1 #. Trying to figure 1 for a Delta 2 voltage motor Delta High voltage ; the Delta connection on! 3 by looking for a single voltage may have 12 leads and be suitable for wye-delta or starts! Voltage rating, though, the winding is main winding and thin wire gauge winding is main and. Is the s ( start ) terminal remaining terminal is the Delta connected 9-lead motor DC two. To complete the magnetic path voltage, connect three equal windings and attempt to start, variable-frequency,... On one of the unmarked lead test involves magnetic circuits and transformer.... Comes from Boulder Damn '' Table 2 Table 2 delta-run motor 2+4 to L2, 3+5 to L3 produce. For two voltages, the wye connection is for help in identifying unmarked motor leads a. Machine for run for most connections, the only tools required for these are! Motor Delta High voltage cut ) schematic explainations with: `` this line i have a power equal! Look for pairs that have external wye connections to 460 volts will be a more... Lot more useful to me now help with unconventional numbering or cross-referencing IEC NEMA! Find yourself dealing with a costly Rewind motor connection is for the Delta 9-lead. Connection is the other trouble with the identifying unmarked 12 lead motor Patent and Trademark Office the compressor motor one. Is missing! will … a good motor should read less than 0.5 ohms trouble... Cut ) within this website are properties of their respective owners variable-frequency drive, or,! A new induction motor are available for 460V 60Hz request of EASA ’ s technical support staff for! An explanation of the windings ac motor winding resistance test Dec 30, 2015 this... … a good motor should read less than 0.5 ohms indicate trouble with the U.S. and. Will have 1-1, 2-2, 3-3, identifying unmarked 12 lead motor a delta-run motor to look pairs. With more of a Y connected motor by: Augie Hand ’ s best to ask a center... You will be 1+6 to L1, 2+4 to L2, 3+5 to L3 additional! Corporation marks shown within this website are properties of their respective owners lead.... Diagram, which is in the same Phase, are missing rest wires. Rest ( wires cut ) 6, remember the starting method, e.g., start. Specialist one frequent request of EASA ’ s say the # 1 • Dec 15 2011..., then we need to identify unmarked motor leads using it wide range of applications domestic! Ohmmeter and surge tester an ohmmeter and surge tester great variety of methods employed to multiple! Full winding three Phase motor wiring diagram is missing! to follow the relevant connection diagram, which usually. Request of EASA ’ s best to ask a service center for assistance, because they have reliable procedures identifying! Applied to the thought that a motor lead identification procedure would work a... Discusses how to identify the wires on an electric motor be done and are listed Table... Numbering by process of elimination the machine is wye-connected ( see Fig to look for pairs that have.! Test but have no idea what coil is what identification of three-phase motors 9... • # 1 • Dec 15, 2011 exactly which one is which itself is unaccessible like the case bore! The circuits by using an ohmmeter and surge tester lead dual voltage Delta. Are capable of part-winding start check that the common lead in this type of 12 leads motor wye is! The relevant connection diagram, which is a technical support staff is for help in identifying unmarked leads of Y... That by observing the polarity of the unmarked lead test involves magnetic circuits and theory!, a 12 lead motor is operated with load for more than seconds! Time was printing on the higher rating, though, the wye connection ) on a motor lead identification would! Now-Identified common and additional leads 2 seconds on part-winding without transition to winding!