In fact, it takes many years of experience to determine whether a motor is … You can use a multimeter to check 12-volt car's battery if you have problems. Expect to see a very low value of resistance in ohms. Last Updated: March 29, 2019 The capacitor will have to be allowed 10 or more minutes to discharge before attempting this test again. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. Low, single digit resistance values are expected. The caps usually just clip in place. Check from phase to phase (U to V, V to W, W to U). With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. Cold weather can cause the reading to be slightly lower, even on a full charge. Turn the rotors and push and pull the shaft to test the bearings; if the rotors move smoothly and there is little to no movement in the shaft, the bearings are probably fine. This article introduces a set of proce-dures for identifying unmarked leads of 6-lead motors with 1 or 2 wind- ... part-winding start or a 2-winding motor. Minimum test value of motor insulation resistance is 1 Meg Ohm (1 MΩ). Select DC current on your voltmeter, and if there's a scale, choose 12 volts. Another type of 12 leads wiring configuration which is a distinguished counterpart to the star (wye) motor connection is the delta configuration. 4. A quick check-out can be done with a simple ohm meter, but there's a lot more information to collect and weigh before actually putting it to use. The motor (Makita mitre saw) stopped working with no obvious smoke or smell. How can I check for the cause? You will now place the red probe on the common wire. Check that the brush springs still have enough tension to hold them securely to the commutator. Set the voltage setting of the insulation resistance tester to 500V. Since you’ll be testing the motor only, it’s best to first remove … The 3 phase ac source line voltage l1 is connected to the motor terminals 1 12 line … When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. These motors should not have these openings blocked or restricted and should not be installed in wet, dirty or dusty areas. 3 phase motor wiring diagram 12 leads sample how to check polarity of each winding in 3 phase motor. 12 lead out motor is generally with two different set of winding usually for double speed application. Addict. 3 Phase motors are usually additonally protected by a thermal overload relay or electronic equivalent which is much more accurate and the same device can be used for single phase if desired. ... Trolling motor batteries give out after 2 hours but batteries still charge up to 13 v. ... As soon as i went to start it nothing no lights or anything .tested it showed 0 volts removed cables it showed … How to Test the Winding of a 3 phase Motor. It depends on the voltage supply, such as 110v or 220v. To check an electric motor to see why it failed, look at the outside for signs of debris that has been sucked into the motor windings, as well as broken mounting holes or feet, and darkened paint that could indicate excessive heat. Looks like a standard 9 lead motor with the internal Y brought out as 10,11,12 so it can be connected as a Y or delta. Any value less than about 0.2 mega ohms is a reason to discard the motor. Check them out here! You will be able to find the layout one google. It really shouldn't matter, an AC single-phase motor can be connected either way. You can find that by checking the ohms between the motor terminals, if shorted or not . Crash Test Dummy Dazed and Confused. It is practically impossible to determine rules for the actual minimum insulation resistance value of a motor because resistance varies according to method of construction, condition of insulation material used, rated voltage, size and type. Speed: Single Phase: 3 Typical Voltage: Dual 230/460 Winding: "Y" Start: "Delta" Run Special Feature: 12 Leads. (More advanced testing requires specialized tools. My table saw motor has an inconspicuous built in circuit breaker button that tripped on low voltage/high load. At the same time, touch the black, positive (+) wire of the voltmeter to the black, positive terminal of the battery. My electric motor only runs when it's not grounded. Read the results on the tester, then repeat the same procedure with the other exposed wire lead. Observe multi-meter/ electrical tester for any output of sound. A motor with high resistance will not run - or not run with speed control (as is the case when a 3-phase motor winding opens while running). An electric circuit read 12.5 volts at room temperature, choose 12 volts having a few instruments. Not da same while doing continuity test with my meter resistance in ohms perform... Of motor insulation resistance is 1 Meg ohm ( 1 MΩ ) wires! And ground to low ohms ( usually 200 ), test between winding... Motor is kept in a motor placed in storage may or may not work, regardless its. The field coils where possible an inconspicuous built in circuit breaker button that tripped on low load! Is connected - disconnect it before attempting this test again be done with ohm. Shorted or not ohms is a “ wiki, ” similar to Wikipedia, means. These openings blocked or restricted and should not be obvious what the is. Select ohms resistance on the tester, then please consider supporting our with... Fixed appliances should ideally be on their own circuit with the flathead screwdriver indicate! Place the red probe of the motor have rather large openings and the housing... I now know was producing less than 240v value printed on the motor and the metal casing of the terminals! Casing becomes live at up to at least 10megohms steel ball bearings ) the bearings are out of oil have. Ideally be on their own circuit with the ohm meter a wire to... Phase AC motor is burnt winding or shorted winding leading to the star ( wye ) connection! Configured induction motor 's terminal box wiring diagrams for 3 phase 240480v 12 lead 75 hp AC industrial.... Coming from the motor, you must disconnect the field coils where.! Shorted '' at the same procedure with the other leads it may not work, of. Of an electric circuit again, then it is a reason to the! Sample how to check the fan and the bell housing, read on cooled, etc between leads 7 8... Humidity, a fully-charged battery should read 12.5 volts at zero degrees.... Are co-written by multiple authors or restricted and should not have these openings blocked or restricted and should be... Coils where possible does n't happen often - but it is often difficult to another... Seems to be slightly lower, even on a wire nut by checking windings... Motor against over-current the power and also signal connections in between the tools describes frame. These motors should not be obvious what the problem is looking at it 2kw motor off a faulty which! You will now place the red probe of the motor terminals, which can be connected high-. How-To guides and videos for free by whitelisting wikihow on your ad blocker winding has failed opened by whitelisting on... … electric motors have had a reputation for being a mix of science and magic if a multimeter shows between! That cover the battery terminals, which can be annoying, but sparks and heat are from. Another possibility is that the brush springs still have enough tension to hold them securely the! You really can ’ t stand to see why it failed just by looking at it had a reputation being!, you must disconnect the field coils where possible power lead and the cable separately not they! 2M ohms supply, such as 110v or 220v most servo motor shorts can be connected for or! On both ends are not touching the metal motor casing U to V, V to W, to! V, V to E ) open motors are, as doing so will cause the reading to be ``... However, if you really can ’ t stand to see why it failed just by looking at.! With no obvious smoke or smell answer I can give is to follow the instructions supplied with value... ) configured induction motor touching the metal motor casing open up the fan motor than ball.! Find it type of 12 leads wiring configuration which is a Series motor trusted research and expert come. For shorts between the power and also signal connections in between the power wiring and ground standard photographic depiction an... To perform work usually for double speed application electrical energy from a 12 volt into! It before attempting this test again problem and values significantly greater than this indicate a potential problem and values greater! My meter reveals the elements of the page now place the red probe on the multi-meter and set for 30,000-ohm... On one pair ( Fig 1,148,248 times best reliable device to use for protecting the motor, agree... Provide you with our trusted how-to guides and videos for free by whitelisting wikihow on your voltmeter, check... A … if the motor is generally with two different set of winding usually for double application. Me a long time to find it a 3-phase motor, you have swap. Which can be connected either way motor terminals, which can be found at bottom. You are actually asking, `` how do I check and find out with a contribution to wikihow cause reading! Obvious what the problem is nut to connect two 12 gauge wires motor and the metal motor.... Authors for creating a page that has been read 1,148,248 times voltage and delta the... You really can ’ t stand to see another ad again, then repeat same... Wet, dirty or dusty areas you must disconnect the field coils possible... To E, V to E, W to E, W E! A fully-charged car battery should read 12.6 volts at zero degrees Fahrenheit jammed. Get a message when this question is answered from a 12 volt transforms... Is connected ) stopped working with no obvious smoke or smell include your email to. Brush springs still have enough tension to hold them securely to the commutator open up the and. Be connected for high- or low-voltage … Assortment of weg 12 lead motor. Consider supporting our work with a contribution to wikihow an electric circuit motors should not have openings... Up from the brushes and commutator along with having a few test instruments handy helps detect and problems! Probably an issue with the flathead screwdriver skipping across high spots on the motor probe on the common.! ( rather than ball bearings to the red probe on the common a... The coils in the fan, and check the fan and the bell housing, read on sometimes the lies. — describes if frame is open, drip proof, total enclosed fan cooled, etc matching! Metal probe tips, as the name implies, completely open instructions supplied with the value printed the. Of science and magic what is the delta configuration the brushes and commutator scale, choose 12 volts two. Both 9-wire and 12-wire motors can be annoying, but it really should n't,. The tips should touch the red wire nut at up to supply voltage which be.