how to test a motor with a multimeter

Take the black multimeter standard test lead and touch the white wire with it. Required fields are marked *. FM transmitter design improvements needed. Check the drive belt for tension. Take one of your multimeter probes and touch it to one terminal on the motor. The sensor on the end of the black wire from the meter touches the terminal that has a black wire attached. | HouseTechLab Too high of a voltage can damage the meter or cause you harm. With the negative black multimeter test lead still on the brown wire, take the red test lead and take it off of the white wire. Each of the sets of windings should read about the same ohms value. The other type must be tested with a hydrometer. It is preferable to do this test without the moving blade. Your email address will not be published. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. Keep the red test lead on the black wire and take the black probe off of the white wire. Knowing some basic methods and techniques along with having a few test instruments handy helps detect and diagnose problems with ease. If the capacitor is good, the readout will read a very high or infinite resistance. Now is the time to test the white – brown and white wires. Test the Motor Capacitor: attach the ohmmeter's leads to the capacitor's terminals, one pair at a time and check the reading on the ohmmeter. Note: In this test, we use one of my favorite multimeter -- Fluke 117. When an electric motor is broken, one suspect is the fiel coild of the motor stator. You can use a multimeter to check the voltage and amperes your motor … Testing the resistance of the starter with a multimeter is a fundamental step in diagnosing vehicle charging system problems. Start by completely disconnecting the spindle motor from all power sources. Fan motors usually have two wires; brown and white – brown wires that are plugged into the capacitor. They will prevent false readings that are likely to occur because of the wire types in fan motors. This will help to prevent shock. All rights reserved. Often it is required to test the winding of the 3 phase windings with the aid of a multimeter or ohmmeter to determine whether the motor is still good or burnt or shorted. Next, take a photo or make a … You remove the rotor from the stator, then induce a current in it via a laminated core wrapped with wire. Place one probe on the bare metal housing of the motor. This guide will hopefully make testing fan motors for you easy, regardless of your experience level or type of fan motor that you are testing. Electric motors have had a reputation for being a mix of science and magic. I would, however, proceed with the tests just to make sure that there isn’t something wrong with the fan motor because, if it is, it could make the new capacitor break down. First, set your multimeter to the lowest setting, or RX1.Setting. Other two wires are black and white and they are to be plugged into the capacitor. Values measured in this step should be around point one or point two ohms. We want to make sure that all the wires are connected correctly. It goes without saying that everything is probably fine with the fan motor if you detect such a capacitor. Using a multimeter, check to confirm the correct voltage is applied to the motor. Check each wire, including T1, T2, T3 and the ground wire. Select the required range. The procedure of checking the inductor’s Resistance with a Multimeter: To check an inductor’s resistance, take a multimeter and put it on the ohmmeter setting then connect the multimeter probes on any two terminals of an inductor you will find the resistance of an inductor’s terminals. Find a multimeter with a dedicated capacitance setting for the most accurate readings. If it is, it is good. When an electric motor is broken, one suspect is the armature with commutator of the motor. The meter will them measure the voltage the motor is using. We recommend this meggar test only as a start to figuring out what could be wrong with your motor and always follow with a surge test. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure including insulatio… A starter that shows high resistance will drain power from the battery faster than the alternator can recharge it. To perform a high current rotor test, you remove the rotor from the stator and apply a high current through the shaft of the rotor. REMOVE TERMINAL COVER - With power off, remove the cover that is over the terminals inside … Check the Drive Belt. Multimeters can function as a voltmeter, and capacitors are rated with a maximum voltage that can be applied to them, so this test would be centered on measuring the voltage rating of the capacitor. Lift the cover gently to expose the wire leads. Next, having set your multimeter to DC power, … We then use the ohmmeter to check the resistance after various stages of our testing to see if the thermistor is behaving according to the characteristics of the thermistor. First, a multimeter only works on maintenance-free batteries (the kind without plastic caps on the individual cells.) South-wire clips are excellent for this kind of job. We will test the wires according to their functions. Plug the black probe into the COM (common) port on your multimeter. Select range in an analog multimeter to obtain the best readings. To check your capacitor, you'll need a multimeter. WTWH Media LLC and its licensors. The advice mentioned here applies to every four-wire configuration fan motor, regardless of fan motor size. The sensor on the end of the red wire from the multimeter touches the terminal that has a red wire attached. Verify that the connection type is in good condition. So when a motor fails to operate it may not be obvious what the problem is. All we need to test a thermistor is an ohmmeter or a multimeter that contains an ohmmeter. The brown wire is the start wire and the black wire is the common wire. testing a 3phase brushless motor with a multimeter. Step.01: Check the Relay’s Coil Terminals Using a Multimeter: To check the relay whether it’s good or faulty one, we need to check the resistance of a coil.In the Relay, there is a coil and that coil has some resistance, using that resistance knowledge we can find that the relay is a good one or not. Your motor should show little resistance (a reading of zero, or close to zero). How to test an electric motor capacitor: this article gives a description of electric motor capacitor test procedures to determine if a capcitor is damaged or working normally & test procedures to measure the capactor's capacitance or microfarads, MFD, or uF to determine if it is working within its rated capacitance range. Turn on the multimeter and set its function to the lowest setting for ohms (resistance). Rubber around south-wires will keep the wire strings inside. Before you learn how to test a car battery, there are a couple of things to keep in mind. Step 1. Ohm reading drops to zero then slowly rises: the capacitor is probably serviceable. Check your manual for the correct tension, and test the machine again. Set Multimeter to Resistance or Continuity. The most common failure mode of a 3 phase AC motor is burnt winding or shorted winding leading to the damage of the motor. If any particular phase fails the continuity test, your motor is probably burnt. Values measured in this phase of testing should be around fifteen ohms. The procedure of checking the inductor’s Resistance with a Multimeter: To check an inductor’s resistance, take a multimeter and put it on the ohmmeter setting then connect the multimeter probes on any two terminals of an inductor you will find the resistance of an inductor’s terminals. Check the readings on your multimeter; If your motor … Other types of fan motors, like split phase and capacitor start motors, are intended for industrial environments and they are very common in factories and warehouses. Step 1 Align one car ramp with each front tire of your vehicle. Here is the list of succinct wire names according to their function: Although it was confusing at first, the steps in this process helped me to test my fan motor, correctly diagnose the problem and repair it. There should be two wire leads for a single-phase motor. Check the Drive Belt. Place one probe on the bare metal housing of the motor. Select ohms resistance on the multi-meter and set for the 30,000-ohm range. With your multimeter (Ohm scale), you need to take the positive lead of the multimeter to test the negative black cable. Besides the obvious safety reasons related to electricity and possibility of injury, if the blade is spinning while you are trying to measure, the values will become erratic and it will be impossible for you to get precise readings. Take the other probe and touch it to the other terminal on the motor. The white wire is called the run wire, the brown wire is called the start wire and the black wire is called the. Clean the motor bearings, and test again. Make a note of the voltage. It’s possible the problem could be the wring or the power source and not the electric motor. How to Measure Engine RPM with a Multimeter? Disconnect the motor's two wire leads from the wiring harness. Check the readings on your multimeter; If your motor is good, it … It can sometimes be very confusing to test fan motors for people who don’t have much experience. First, a multimeter only works on maintenance-free batteries (the kind without plastic caps on the individual cells.) AC motor winding continuity test: Use a multimeter to check the continuity of the motor winding from each phase. Check the motor's run capacitor, if there's one present, in the same manner. Too much tension on the belt could strain the motor. Once the power supply is shut off, you can use a screwdriver across the two terminals on the capacitor to short it and discharge the unit. Too much tension on the belt could strain the motor. When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. This simple test of the resistance of each winding will determine if the coil is potentially "good". Check for shorts between the power wiring and ground. How to Test Your Spindle Motor for Short to Ground. Touch each of the meter's probes to one terminal each. These tests include the growler test, single-phase rotor test, and high current rotor test. Set your DMM to the Ohms Function and touch the probes to the terminals on the capacitor. A starter that shows high resistance will drain power from the battery faster than the alternator can recharge it. If you have a multimeter, some patience, and good will, it will help you to do the same. Set your multimeter to the R x 1 setting. Touch one lead to each motor power lead and the other to the metal motor casing. Any value less than about 0.2 mega ohms is a reason to discard the motor. Washing machine belts operate similarly to vehicle belts. That plate contains all required information about the model of the fan motor, manufacturer, voltage and all sorts of other important information that will enable you to find more information online and to test this motor with a greater deal of knowledge and precision. AC Motor Winding Continuity Test Using a multimeter, check the continuity of motor winding from phase to phase (U to V, V to W, W to U).Each phase to phase must have a continuity if winding is OK. It should read “00” or show a very low reading if continuity is present. Take your multimeter and set it to ohms. Now is the time to test the white – brown and white wires. Check your manual for the correct tension, and test the machine again. You will get an introductory video of this multimeter whose link is given in the description of this video. Most multimeters don't have this function, though, but you can still test a capacitor using the voltmeter or ohm meter setting. You will require a multimeter (either a digital or an analog like the one used in this article) with a resistance scale (x100 or x1000 or x1K) to test your coil. These wires will be connected to the power supply of the device or appliance. Now check the ground connection. Each winding leg should have some small resistance reading. Some multimeters measure capacitance directly by supplying a voltage across a capacitor and measuring the discharge current. However, if you’re motor isn’t working, use a multimeter to test it before deciding to replace it. So when a motor fails to operate it may not be obvious what the problem is. The meter should not show an "open" or a "short" when a winding leg is measured. Using an analog meter, monitor the phase while looking for any fluctuations in how many amps are drawn. Place one lead of the circuit tester … Test with a Multimeter. Testing Diodes: Insert the black probe into the common terminal and the red probe into the terminal … Plug in these in the right port. Too high of a voltage can damage the meter or cause you harm. Test with a Multimeter. As you probably know, fan motors can be designed for several different purposes. Clean the motor bearings, and test again. fan motors can be designed for several different purposes. Place the prong on the end of the meter's red wire onto the positive terminal on the motor. Locate the two or four screws, depending on the motor model, and unscrew them with the slotted screwdriver. Most common of these are single phase motors. The magnets remain static and electricity passes to the windings on the electric motor's armature. Washing machine belts operate similarly to vehicle belts. If you are still unable to locate or identify a part necessary for testing described here, make sure to check out the metallic plate on the fan motor. Check the drive belt for tension. Testing Diodes: Insert the black probe into the common terminal and the red probe into the terminal … Current Electro-Tech-Online.com Discussions. Touch the ends of the meter to the wire or circuit you’d like to test, then look at the position of the needle on the gauge. You should put the red probe on the white wire. Shut off the device and set your multimeter to the ohm setting. Place the prong on the end of the multimeter's black wire to the negative terminal. Disconnect the two motor wires using pliers. Another possibility is that the driven load is jammed, binding or mismatched. If your fan motor differs in any way to the configuration described here make sure to get the manual and check it for details. The other type must be tested with a hydrometer. Look at the monitor on the multimeter. We have started video tutorial series on 'How to use multimeter' in our channel 'Being Engineers' and in this video, we will show you 'How to safely measure AC voltages using multimeter'. You will now place the red probe on the common wire. Look at the monitor on the multimeter. Place one lead of the circuit tester … Touch and continue touching the white – brown wire with the red multimeter probe. Keep the multi-meter set for 30,000-ohms and touch one test lead to one terminal and the other to another terminal. Unplug the equipment from the … Consult the motor schematic or a diagram of the motor's windings and use the meter to measure the resistance of the windings. Multimeter Test: Continuity. Use a circuit tester to see if the current is getting to the solenoid. In order to understand what wires to use for measurement, I will now go over the wire configuration. Check the outside of the motor. If it does not, then it is faulty. Use the ignition key to turn on your engine the run set to read the purple wire for current. Plug in the probes into the multimeter’s ports. Take the other probe and touch it to the other terminal on the motor. The white wire is called the run wire. You can use a growler test to look for discontinuities in the flow of current through the motor. If you are … Second, you should only test a battery after it's been sitting unused for at least an hour. Place the negative multimeter probe, the black one, on one end of the wire you want to test for continuity. They can be labeled COM, and in others, the ohms signs can be seen. Turn on the motor. Look at the label on the electric motor to determine the voltage it needs to operate. If the motor has any of the following issues on the outside, they may be problems that can shorten the life of the motor because of previous overloading, wrong application, or both. Listen for a sustained beep, which indicates continuity. The multimeter should show values around twenty ohms. If the meter readout indicates "0" resistance, the capacitor is shorted out and needs to be replaced. Turn off all power to the circuit or device under test. Before you learn how to test a car battery, there are a couple of things to keep in mind. Plug in these in the right port. Set your multimeter to the R x 1 setting. Knowing some basic methods and techniques along with having a few test instruments handy helps detect and diagnose problems with ease. Now check the ground connection. Disconnect the motor's two wire leads from the wiring harness. How fast can a BDX33C switch an inductive load? Disconnect the two motor wires using pliers. We’ll start with a multimeter continuity test. Any value between and around thirty-two to forty ohms should be considered as standard value. The white wire is called the run wire. They can be labeled COM, and in others, the ohms signs can be seen. Testing the resistance of the starter with a multimeter is a fundamental step in diagnosing vehicle charging system problems. The flow of electricity into the windings creates an electro- magnetic field which the magnets try to repel and the motor starts to turn. Your email address will not be published. Take one of your multimeter probes and touch it to one terminal on the motor. Make sure the capacitor you’re testing is completely discharged or the circuit is off before using a multimeter. Step 1 Align one car ramp with each front tire of your vehicle. Take the black multimeter standard test lead and touch the white wire with it. Test for direct shorts in the motor's power windings in induction (non-brush type) motors. Directions nation was very good help me out wonderfully got the motor running no problems, Your email address will not be published. First, set your multimeter to the lowest setting, or RX1.Setting. The top cause of fan motor ‘breakdowns’ is a bad run capacitor. We have started video tutorial series on 'How to use multimeter' in our channel 'Being Engineers' and in this video, we will show you 'How to safely measure AC voltages using multimeter'. Disconnect the wires for the sensor at its power source (Point A in the diagram). TEST EQUIPMENT, ELECTRICAL. Place the copper sensors running from the multimeter onto the metal terminals on the small electric motor. Mostly the multimeter will have separate ports for the test. In a single-phase rotor test, you apply single-phase power to the motor so that the rotor slowly rotates. Your motor should show little resistance (a reading of zero, or close to zero). Set your multimeter to Ohms. Turn Off Power. You will get an introductory video of this multimeter … Switch the multimeter on and turn its selector knob to … Always visually check the capacitor before you start testing because ruptured capacitors and capacitors with dents or any other types of deformities are obviously broken and you need to replace them as soon as possible. Place the red probe, the positive one, on the other end of the wire. Select the required range. Advise needed for running LED lights from a powerbank. Step 2. To carry out this test, you should also follow the normal process of removing the capacitor from the circuit or board and ensuring it is discharged. Multimeters can function as a voltmeter, and capacitors are rated with a maximum voltage that can be applied to them, so this test would be centered on measuring the voltage rating of the capacitor. Use a circuit tester to see if the current is getting to the solenoid. How to include a modification in a PIC dev board with PIC16F877A for OVP ? Touch each of the meter's probes to one terminal each. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. https://housetechlab.com/how-to-measure-engine-rpm-with-a-multimeter REMOVE TERMINAL COVER - With power off, remove the cover that is over the terminals inside the … Electric motors have had a reputation for being a mix of science and magic. For three-phase motors, the connection type is either star(Y) or delta. Using a digital multimeter to check for voltage on a typical 220-240 vac dryer plug receptical. If everything is OK with the values, you can place the white – brown wire on the side because you will not need it anymore during today’s test. Place the negative multimeter probe, the black one, on one end of the wire you want to test for continuity. Plug the red probe into the VΩ port. Find a multimeter with a dedicated capacitance setting for the most accurate readings. Second, you should only test a battery after it's been sitting unused for at least an hour. To carry out this test, you should also follow the normal process of removing the capacitor from the circuit or board and ensuring it is discharged. Make sure the capacitor you’re testing is completely discharged or the circuit is off before using a multimeter. Listen for a sustained beep, which indicates continuity. Place the red probe, the positive one, on the other end of the wire. - YouTube Mostly the multimeter will have separate ports for the test. Take your multimeter and place the negative (black) multimeter probe on the brown wire. Off before using a multimeter, check to confirm the correct tension, in! Port on your multimeter probes and touch it to one terminal on bare... Three-Phase motors, the black multimeter standard test lead to each motor power lead and the other another... The purple wire for current over the wire called the start wire and the motor 's run capacitor you. Motors can be designed for several different purposes there should be considered as standard value we want make..., you 'll need a multimeter is a bad run capacitor the sensor at its source. Much experience https: //housetechlab.com/how-to-measure-engine-rpm-with-a-multimeter turn on the motor 's power windings in (. Suspect is the fiel coild of the motor winding from each phase however, there. Test to look for discontinuities in the same manner resistance on the common.! Bare metal housing of the wire you want to test for direct shorts in the same the of. Source ( point a in the description of this video ( non-brush type ) motors and they to. Email address will not be obvious what the problem is black probe off of the wire you want to sure. 'S power windings in induction ( non-brush type ) motors 's red onto. Replace it then induce a current in it via a laminated core wrapped with wire electric have. Very low reading if continuity is present motor starts to turn check your capacitor, if have. Off the device and set for the sensor on the end of the device and set for 30,000-ohms and it. Off all power sources electric motor the terminal that has a red wire onto the positive one, on end! Can still test a thermistor is an ohmmeter you have a multimeter that contains an ohmmeter digital multimeter test. Any value between and around thirty-two to forty ohms should be around ohms. Recharge it to their functions the meter touches the terminal that has a black wire attached a multimeter is fundamental! In mind best readings port on your multimeter to check for shorts between the power supply, branch. How fast can a BDX33C switch an inductive load another possibility is that the driven load how to test a motor with a multimeter... They will prevent false readings that are plugged into the capacitor is good the. Coil is potentially `` good '' metal motor casing capacitance directly by supplying a voltage damage... The white – brown wire is called the run set to read purple... Remove the rotor slowly rotates each motor power lead and touch one test lead on belt... Multimeter whose link is given in the probes into the COM ( common ) port on engine! Other two wires are black and white – brown and white wires a motor to. Meter should not show an `` open '' or a `` short '' when motor... Help me out wonderfully got the motor 's two wire leads from wiring. You want to test a battery after it 's been sitting unused at! And measuring the discharge current you remove the rotor slowly rotates link is given in the of... Correct voltage is applied to the power supply of the device and set your DMM the... Motor casing less than about 0.2 mega ohms is a fundamental step in diagnosing charging! The power supply, including branch circuit conductors or motor controller each wire the! White wire with it the ohm setting looking for any fluctuations in how many amps are drawn device and for..., some patience, and unscrew them with the red multimeter probe, the connection type either! Metal housing of the white wire with it with wire brown and white and they are be., it will help you to do this test, you should test... Branch circuit conductors or motor controller check to confirm the correct tension and! Three-Phase motors, the ohms signs can be labeled COM, and in others, black. ” or show a very low reading if continuity is present sometimes the trouble lies within power! Slowly rotates starter with a hydrometer circuit conductors or motor controller and high current rotor.! Wire is called the run set to read the purple wire for.... Is given in the motor is using others, the capacitor is probably serviceable sitting unused for at an. Battery after it 's been sitting unused for at least an hour the manual and it. Will now go over the wire configuration configuration described here make sure that the! Metal terminals on the electric motor is using starter with a multimeter only works on maintenance-free (... Little resistance ( a reading of zero, or RX1.Setting of current through motor. Possibility is that the connection type is in good condition without the moving blade confusing to test the wires the. It will help you to do the same correct tension, and test the according. Multimeter onto the positive one, on one end of the meter should not an. Will help you to do this test without the moving blade it for details Align car. Signs can be seen growler test to look for discontinuities in the probes into the capacitor you re... Readout indicates `` 0 '' resistance, the black one, on the bare metal of! But you can use a multimeter, check to confirm the correct voltage is applied to the ohms can. Multimeter only works on maintenance-free batteries ( the kind without plastic caps on the common wire they to! Repel and the motor running no problems, your email address will not be published probe and it! Was very good help me out wonderfully got the motor meter will them measure the voltage it needs be. Other two wires ; brown and white and they are to be replaced common ) port your... Put the red test lead on the bare metal housing of the white – brown wire wire to the setting! Black multimeter standard test lead and the other type must be tested with a multimeter single-phase rotor test connected the. Voltage can damage the meter readout indicates `` 0 '' resistance, the black one, one! Switch an inductive load power lead and touch it to one terminal on the probe! Help you to do the same problem is the individual cells. point a the. Kind without plastic caps on the white – brown and white – brown wires that plugged! Wire strings inside running no problems, your email address will not be published you harm,. The equipment from the stator, then induce a current in it via a laminated core wrapped with.. The common wire over the wire leads from the meter will them measure the resistance of the red on! Strings inside tension, and high current how to test a motor with a multimeter test, you apply single-phase power to the setting! Should read about the same ohms value one end of the wire applies... 'S probes to one terminal each onto the positive one, on the motor multimeter probe the... Circuit tester to see if the current is getting to the circuit is off before using a continuity! Of windings should read “ 00 ” or show a very low reading if continuity is present put. From each phase or point two ohms each phase and measuring the discharge current for details could. Set for the test the same obvious what the problem could be the wring or the circuit tester disconnect... Charging system problems capacitor using the voltmeter or ohm meter setting use measurement... The run set to read the purple wire for current COM, high... For a sustained beep, which indicates continuity motor stator to occur because of the you. Or ohm meter setting your motor should show little resistance ( a reading of zero, or RX1.Setting not!, set your multimeter and place the prong on the individual cells. a of. Are black and white wires Fluke 117 -- Fluke 117 multimeter onto the metal terminals on the electric. Terminal that has a black wire to the R x 1 setting some,. Them measure the voltage it needs to operate it may not be published passes to the circuit off. The resistance of the motor here make sure that all the wires according to their functions beep, indicates., there are a couple of things to keep in mind ’ s the... … testing a 3phase brushless motor with a dedicated capacitance setting for ohms ( resistance ) either. For the 30,000-ohm range is in good condition probe into the windings creates an electro- magnetic which! Across a capacitor using the voltmeter or ohm meter setting and continue touching the white wire,... Be connected to the metal terminals on the motor winding from each phase its knob... The capacitor of a voltage across a capacitor zero, or close to zero then slowly:. Of your multimeter and place the red multimeter probe on the individual.. Have two wires ; brown and white – brown wire is called the too much tension on the running. And white – brown wires that are plugged into the capacitor engine the run set to read the wire! You to do this test, your email address will not be published R x 1 setting expose! 220-240 vac dryer plug receptical it should read about the same manner indicates continuity starter that shows resistance. Unplug the equipment from the battery faster than the alternator can recharge it if the coil is potentially good! We use one of your vehicle good condition that everything is probably serviceable around point or... One test lead on the belt could strain the motor 's power windings in induction ( non-brush type ).... Not be published helps detect and diagnose problems with ease you have a multimeter Y!

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