Open motors are, as the name implies, completely open. Do the following with the motor disconnected. Turn on the power unit that supplies electricity to the electric motor. It is preferable to do this test without the moving blade. A motor fails when its windings short to ground, short to each other, or open--a break in the winding's wire. There are few, if any, serviceable parts in small electric motors, and generally it’s less expensive to buy a replacement rather than attempt a repair. If you don’t get a measurement, then it means power isn’t reaching the motor, so it may not be the motor that’s faulty. Note: In this test, we use one of my favorite multimeter -- Fluke 117.
It goes without saying that everything is probably fine with the fan motor if you detect such a capacitor. Other two wires are black and white and they are to be plugged into the capacitor. Pull chain switches that are obviously stuck are a good sign of trouble. It depends on the voltage supply, such as 110v or 220v. The brown wire is the start wire and the black wire is the common wire. With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. Check the power source. All rights reserved. For information on how to check the fan and the bell housing, read on! Home | Electric Water Heaters | Gas Water Heaters | Toilets | Drywall Patching | Basic House Wiring | Fixing Doors | Fixing Pocket Doors | Support. How To Test Ceiling Fan Wires With Multimeter masuzi September 18, 2018 Uncategorized Leave a comment 21 Views Ceiling fan testing with multimeter check for live wires in a wall fixture 3 wire ceiling fan common start run ceiling fan winding with multimeter Check the pull chain and make sure the light is turned on. Take the ends off, clean out the bearings with steel wool, polish the shafts with fine emery cloth, oil up the lubricating felts and put it back together. The top cause of fan motor ‘breakdowns’ is a bad run capacitor. Drip-proof motors can be installed in damp or wet locations, so long as they are installed in such a way that water (and other liquids) can not enter due to gravity and must not be subjected to a stream of water (or other liquids) directed at or in it. WARNING!! How do I check and find out with a multi-meter whether a motor is faulty or not? Tools, Reference Materials, Resources and Basic Information for Learning Electrical Engineering. If there is any reading on any of these then the motor is bad, do not use it. TEFC motors on the other hand, can be used in all the previously mentioned areas but must not be submerged unless designed specifically for the purpose. The wire in the windings use an insulating covering as an isolation barrier. Fan motors usually have two wires; brown and white – brown wires that are plugged into the capacitor. What could be the problem? What are the first things to check for repair? How do I reverse the direction the motor runs?
If it is connected - disconnect it before attempting the steps below. If it has bronze sleeve bearings (rather than ball bearings) the bearings are out of oil and have seized up. You need to replace the wiring before your motor will work. Turn on the multimeter. James Stevens has been writing articles for market research companies in the U.K. since 1990. See 'Ceiling Fan Troubleshooting' or 'Electrical Repair' if this is not your problem. It may seem overly simple, but testing for ceiling fan power is a good first step. Make sure your hands are not touching the metal probe tips, as doing so will cause the reading to be inaccurate. A motor placed in storage may or may not work, regardless of its physical appearance. Try another one, and make sure it is tight in the socket. If the switch is part way in between the forward or reverse positions, the fan won't work. To create this article, 23 people, some anonymous, worked to edit and improve it over time. Rubber around south-wires will keep the wire strings inside. Your question actually refers to the supply of power to the motor, which could be corded, hardwired, and has factors such as gauge and length. For information on how to check the fan and the bell housing, read on! They will prevent false readings that are likely to occur because of the wire types in fan motors. 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. wikiHow is where trusted research and expert knowledge come together. Kirchoff's current/voltage laws, superposition and thevinens. electronic multimeter image by Albert Lozano from, Copyright 2020 Leaf Group Ltd. All Rights Reserved. However, if you are actually asking, "How do I connect the wires in a motor? Another possibility is that the driven load is jammed, binding or mismatched. See below to determine if this is your problem. By using our site, you agree to our. 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. Check the multimeter measurement. Values measured in this phase of testing should be around fifteen ohms. 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. Ensure it is set to measure volts as multimeters. Make sure you turn the fan off before you check this. The white wire is called the run wire, the brown wire is called the start wire and the black wire is called the. It measures the same, or similar, to the voltage you noted from the label on the electric motor if power is reaching the motor. Look for that first. 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. It took me a long time to find it. Take your multimeter and set it to ohms. This article has been viewed 1,141,176 times. The openings in the rear metal guard need to have full and free air movement; otherwise, the motor will overheat and eventually fail. Your email address will not be published. You can find that by checking the ohms between the motor terminals, if shorted or not . Fixed appliances should ideally be on their own circuit with the MCB sized to suit the appliance. There are few, if any, serviceable parts in small electric motors, and generally it’s less expensive to buy a replacement rather than attempt a repair. Now is the time to test the white – brown and white wires. My electric chainsaw motor still runs, but sparks and heat are coming from the brushes and commutator. Make Sure the Power is OFF Before Working With Electricity!!! You need to check if electricity is getting to the motor. All tip submissions are carefully reviewed before being published. Find the two small metal terminals on the electric motor. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. Check the fan. However, if you’re motor isn’t working, use a multimeter to test it before deciding to replace it. 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. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. Is the fan working and not the light? It’s possible the problem could … The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. % of people told us that this article helped them. It may seem overly simple, but testing for ceiling fan power is a good first step. If you have a multimeter, some patience, and good will, it will help you to do the same. If you don’t get a reading, or the reading is very low, you have a problem with the power source rather than the motor. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure includin… The sensor on the end of the black wire from the meter touches the terminal that has a black wire attached. If you have a reading and your motor isn’t operating, it’s certain the motor is the problem and needs replacing. The objective of any AC motor test is to determine the health status of the motor. 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. Include your email address to get a message when this question is answered. (Check the meter's operation manual if necessary) Choose the highest scale (R X 1000 or similar) and zero the meter by touching both probes against each other. 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. The basic steps in ascertaining the health of any motor are given below, How To Test and Check Single phase Electric Motors, How to Test a 3 Phase Motor Windings With an Ohmmeter, How to Calculate Inverter Power Rating and Inverter Battery Backup Time, How to Measure Electric Motor Insulation Resistance, Types of Earthing Systems Used in Electrical Installations, Resistance and Reactance per km of Copper and Aluminium cables, How to Install and Wire a Photocell Switch in a Lighting Installation. These motors should not have these openings blocked or restricted and should not be installed in wet, dirty or dusty areas. If it's a 3-phase motor, you have to swap only two phases. If my table saw has an sgv motor and the shaft has a problem rotating, should I take the ends off and look inside? Push the reversing switch to one side and see if the fan works.
Adjust the needle to 0 if possible. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. Check C to E, S to E, R to E. Minimum test value for a good electric motor is at least 1MΩ Running Amps Test With the motor running, check the full load amps (FLA) with a suitable meter or preferably a clamp on meter and compare with the motor name plate FLA. Deviations from rated FLA could signify problems with the motor under test. Many have fittings for lubrication while others are permanently lubricated or "maintenance free". 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. The advice mentioned here applies to every four-wire configuration fan motor, regardless of fan motor size. See Step Five below for more information. Take the black multimeter standard test lead and touch the white wire with it. MCBs should be of type C or D to allow for inrush current, and the Z ratings of the circuit must be below the specified threshold in your locality for the rating of the overcurrent device. Why Analog Devices components are sooo expensive? Yes, then you want to check the reversing switch on the side of the housing. 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. It doesn't happen often - but it does happen. Most common of these are single phase motors. It can also measure amperes and ohms. Home Repair Central is dedicated to saving homeowners money on simple and not so simple repairs. The other possible problem for the fan and the light are the pull chain switches.
The sensor on the end of the red wire from the multimeter touches the terminal that has a red wire attached. It is not that uncommon for a motor's windings to be both "open" and "shorted" at the same time. After that, get out your ohm meter and start checking the windings for an open coil.