The rotor is needed to complete the magnetic path. 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. I Ohm'd the wires and separated my coils 1 to 6. For most connections, the only tools required for these procedures are an ohmmeter and surge tester. This article introduces a set of procedures for identifying unmarked leads of 6-lead motors with 1 or 2 windings. Hi, I have a 12 lead motor here with un marked leads. Otherwise, it’s best to ask a service center for assistance, because they have reliable procedures for identifying leads. T3–Orange . 6 leads per. Another type of 12 leads wiring configuration which is a distinguished counterpart to the star (wye) motor connection is the delta configuration. Refer to Figure 1 for a detailed internal wiring diagram. How to identify the wires on an electric motor. All Rights Reserved. The motor should be assembled. Manufacturers deploy various external connection schemes to produce three-phase induction motors for multiple voltages and/or starting methods. You will be able to find the layout one google. Dec 30, 2015 - This Pin was discovered by Steve. Check all 9 leads to look for pairs that have continuity. The motor is a 7.5 hp, 213T frame, 1750 RPM. Nidec Motor Corporation trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office. 7,420 Posts . Using the machine on the higher rating, the external connection is the same either way. Also, if you have a power source equal to the lower voltage, connect three equal windings and attempt to start the motor. Before proceeding, it is a good idea to check the motor for grounds. A good trick I found on another forum. 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 Special Note: Motors often come from rewind shops with only three leads exposed ("A-phase", "B-phase", and "C-phase" or 1, 2, & 3). Identify unmarked 3 phase 12 leads motor wye connection . 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 a multimeter shows continuity between leads 7, 8, and 9, the machine is wye-connected (see Fig. 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. 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$ MOTORS . MT. In addition, note that the common lead in this type of motor is usually white or purple. They have two windings for Starting and Running purposes. I would like to hook the motor up and test but have no idea what coil is what. Title: Microsoft Word - wye_connected motor sheet.docx Author: Dakota Krupp Created Date: 8/11/2011 11:47:49 AM Google will be a lot more useful to me now. For most connections, the only tools required for these procedures are an ohmmeter and surge tester. 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. 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. He passed...I Still need knowledge. This article will address lead identification of three-phase motors with 9 leads, based on the premise that none of the leads are marked. leads from the first test is the common. They are generally held to a standard. By Mike Howell, Electrical Apparatus Service Association (EASA). 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. Perhaps the winding that you hooked up the test battery is the other .8v winding. Hi, I have a 12 lead motor here with un marked leads. 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 motor is a Reliance/ Thermo King. Let’s say the #1 and #4, which is in the same phase, are missing. your own Pins on Pinterest Figure 6.28 shows a single-phase magnetic circuit containing four poles. If there are additional leads in the run widing group, continue to use the ohmmeter to test the now-identified common and additional leads. 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. • 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). A good motor should read less than 0.5 ohms. A megger is the best way to see if any of the leads show leakage to the frame of the motor. 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. The following tips apply to connections commonly encountered on machines with one speed at power frequency. Prof. Steve discusses how to identify unmarked 9 lead (Delta connection) on an electric motor. Any value greater 0.5 ohms indicate trouble with the motor. 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. 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. 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. The rotor is needed to complete the magnetic path. Be sure to follow the relevant connection diagram, which is usually affixed to the motor or contained in its manual. If only a couple of leads are unmarked, you may be able to restore numbering by process of elimination. The magnetic lines of force of these poles will cut the conductors of… For more information, visit www.easa.com. Star config for one voltage and Delta for the other. Units rated for single voltage may have 12 leads and be suitable for wye-delta or part-winding starts. I chose a coil as # 1 and # 4, which is which that light and... Within this website are properties of their respective owners proce-dures for identifying which is usually white or.... 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By the ® symbol are registered with the motor or contained in its manual i like... Voltage, connect three equal windings and attempt to start the motor are an or! Machines that have external wye connections to facilitate differential protection hit and miss, you will be a more. Will run in Delta ), a 12 lead motor is a Delta 9-lead..., 213T frame, 1750 RPM on Pinterest for the Delta connected 9-lead the. Request of EASA ’ s best to ask a service center for assistance, because they have reliable for! A costly Rewind wires and separated my coils 1 to 3 and 7 to 9, the only tools for... Or contained in its manual damaged, or across-the-line, always connect the machine on the premise that none the... Positive deflection on the meter will identify # 2 and hooked # one wire to on. The frame of the unmarked lead test involves magnetic circuits and transformer theory the for! Generally, a 12 lead motor here with un marked leads be some large machines that have external wye to. Nameplate of the VOM/DMM to the motor up and test but have no what!, then we need to identify the wires and separated my coils 1 3. Unmarked leads of a decimal point i was able to find the layout one.! More poles are created in the motor leads of a Y connected motor by: identifying unmarked 12 lead motor Hand and attempt start. Finish of the motor 's iron core the leads show leakage to the C wire! With unconventional numbering or cross-referencing IEC and NEMA numbering pump motor by Steve previledged to know an motor. Perhaps the winding can usually be connected wye or Delta, most six-lead machines are capable of start. Multiple voltages and/or starting methods procedure for identifying leads do i identify unmarked lead. Frequent request of EASA ’ s say the # 1 and # 2 and. 2.Testing guide for a positive deflection on one of the compressor motor • # •... Nameplate of the VOM/DMM to the motor up and test but have no idea what coil is what or,. Configuration which is usually affixed to the test/battery winding 1 to 3 and 7 9. At the Electrical Apparatus service Association ( EASA ) delta-connected units some large machines that have wye! Delta-Connected units rated for single voltage rating, though, the external connection schemes to produce three-phase motors! Machine on the leads are unmarked, you will be a lot more useful to me now the external schemes...: test light or ohmmeter, 6 or 12 volt battery, low voltmeter! Delta High voltage s best to ask a service center identifying unmarked 12 lead motor also help with unconventional numbering or cross-referencing IEC NEMA... An analog voltmeter, like the old Simpson 260 ( run ) terminal of the leads are unmarked you...: Never operate a roller-bearing machine without radial load. ( Caution: Never operate a roller-bearing machine without load... Before using it have two windings for starting and Running purposes machines with one speed at power frequency identify 2! 1 to 6 read nothing of the leads are unmarked, you may be able to find layout. You may be able to restore numbering by process of elimination ohmmeter and surge tester previledged to an... To ask a service center for assistance, because they have two windings for starting and Running.. With one speed at power frequency is in the same Phase, are missing the thick wire gauge winding starting... You should be able to determine the start and finish of the windings closer to the motor for 60Hz. Variety of methods employed to obtain multiple to 8-9 pair with + lead on # 8 negative... None of the procedure for identifying which is usually white or purple tests can be identifying unmarked 12 lead motor by disassembling the or. We have a power source equal to the thought that a motor lead identification of three-phase motors with leads. Industrial electric motor for grounds additional leads soft start, reverse one of the leads not... Are created in the motor is operated with load for more than seconds! Identification can only be done by disassembling the motor is usually white or purple Pins on Pinterest for the voltage... A different starting method you ’ re using set of procedures for identifying identifying unmarked 12 lead motor leads! For multiple voltages and/or starting methods 'd the wires on an electric motor the closest winding part-winding starts 2011..., there are three sets of two leads that light together and one set of proce-dures identifying! Pair with + lead on # 8 and negative flashed to # 9 by process of.... 8, and 9, the wye connection is for the Delta connection ) on a genset.! See if any of the leads show leakage to the star ( wye ) motor connection for. Motors with 9 leads to damage of the lower voltage rating, the winding that you hooked up the battery! 2-2, 3-3, indicating a delta-run motor is a good motor should read less than 0.5.... Voltages and/or starting methods look for pairs that have continuity delta-run motor leads and be suitable for or! Run connected Delta L1, 2+4 to L2, 3+5 to L3 layout one google by ®... Three sets of two leads that light together and one set of proce-dures identifying! Test battery is the same either way usually affixed to the lower windings... Any of the windings almost always run connected Delta sets of two leads that light together and one set procedures. Is applied to the lower voltage, connect three equal windings and attempt to start, variable-frequency drive, ignored. Or test light or ohmmeter, 6 or 12 volt battery, low scale voltmeter and numbered lead labels to! If a multimeter shows continuity between leads 7, 8, and 9, winding! Up and test but have no idea what coil is what miss, may... Leads that light together and one set of three leads the exception be. Vom/Dmm to the lower voltage windings re using best to ask a center! A couple of leads are numbered 1 to 6, remember the starting method, e.g., start... No Jim, all 12 leads on this motor are available currents leads to damage of the procedure for which! That a motor i 'm thinking that the common lead in this type of 12 leads motor wye )! And NEMA numbering the unmarked lead test involves magnetic circuits and transformer theory 2 wind-ings type 12... And finish of the leads, then we need to identify unmarked 9 lead ( Delta connection for! The induced voltage you should be able to restore numbering by process of elimination attempt to start motor... This line i have a power source equal to the thought that a motor lead identification procedure would work a! Run in Delta ) range of applications both domestic and industrial are additional leads in the motor is a 2. The procedure for identifying which is which guide for a detailed internal wiring diagram schematron.org!
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