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Testing a capacitor for a single phase motor

How to test a capacitor for a single capacitor start motor. Capacitor rated 20 micro farads

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Posted on Jan 02, 2017

erpaalai
  • 999 Answers

SOURCE: wiring a 220v single phase motor and capacitor

Black and white are usually power. an ohmmeter will confirm. Brown are for capacitors. There is almost always a diagram on the motor someplace. Eric

Posted on Jun 17, 2009

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I have a 166-0138 capacitor which is obsolete what can I replace it with


166-0138 is a fasco motor number not a capacitor. if you need a capacitor they are typical items that are rated in voltage and micro farads. you can replace the capacitor with one of the same rating from a hvac supply house.

Mar 17, 2016 | Dayton Permanent Split Capacitor Motor Fan

Tip

How to Reverse the Rotation of Single Phase Capacitor-Start Electric Motors


Reversing the rotation of electric motors can be done easily with 3-phase motors. This can be easily achieved by swapping the connection of any two motor leads. But 3-phase motors are usually found and used for industrial purposes. The ones found and used in our homes, from water pumps to electric fans, are single phase capacitor-start type motors. Unlike 3-phase motors, reversing the rotation of single phase electric motors is no easy task. Swapping any two motor leads will not result in the reversal of the motor rotation. Analysis of the motor windings and connections are necessary before any modification can be done to achieve the desired result. Let's take a 3-speed single phase capacitor-start electric motor with electrical diagram shown below as an example. Make sure the motor is disconnected from the power supply before attempting to follow this tip. This tip is intended only for individuals with electrical knowledge, necessary tools, and understand the risks associated with handling electrical equipments and devices.

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The first step in the process is determining the start winding which is connected to the line (AC white) and to one side of the start capacitor. To accurately determine the start winding, disconnect all motor leads from the start capacitor and the speed switch for multi-speed motors and then setting your ohmmeter to the lowest scale (R x 1), measure the resistances between the AC white line and each of the motor leads connecting to the start capacitor. The one with the least resistance is the starting winding lead.

Once the start winding lead going to the capacitor is determined, reconnect the capacitor then connect the black AC line to the found start winding lead (marked X). Connect the white AC line to L of speed switch, the motor lead formerly connected to AC white to 3, red to 2, and white to 1 as shown below. Leave the green/yellow ground wire connection as is.

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Below are the wiring modifications for 2-speed and single speed single phase capacitor-start electric motors.

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on Jan 11, 2011 | Dryers

1 Answer

On a call for cooling from either indoor thermostat, the respective indoor unit operates properly and the outdoor fan starts but the compressor does not. A click is heard as if the compressor is trying to...


Could be your capacitor in the outside unit. If you have the right tools and are experienced working with high voltages then you can test to see if that is the problem.

***CAUTION***

Anytime you are working on or around electricity you run the risk of shock and or death. If you are not competent working with high voltage and using electrical test equipment, please consider consulting an expert before you open an electrical panel or appliance. You assume any and all liability by continuing with this diagnoses process.


***WARNING***

Capacitors hold a large electrical charge even after power has been removed from them and will discharge upon contact with your skin. This is enough to stop your heart and cause death. If you are not confident in your abilities to work with these devices then please leave any testing or repairs to a professional.


The capacitor is inside the outside unit and you have to remove the cover to see the inside of the electrical compartment. You will need to discharge the capacitor before you start working around it. To do this take a screwdriver or other long metal tool with an insulated handle and cross the three terminals on the capacitor to ground. You then remove the wires to the capacitor terminals, taking note of which wire goes to which terminal.


Capacitors are rated in Micro Farads (marked by a µF symbol) and a dual capacitor, shown in the image below, will have two ratings listed like this "35/5µF" or something very similar. You must have a multimeter that reads micro farads " µF " to check a capacitor.


You do that by placing one probe on the C or COM terminal and the other probe on the FAN terminal and it should read the small number of the rating, for example if your capacitor is rated like this: 30/7.5µF then the fan rating will be the smaller of the two numbers. In this case the 7.5µF (seven and a half Micro Farads). The HERM terminal is the one for the compressor and will be rated the higher of the two numbers, I.E. the 30µF on the capacitor. Check them both and of they are more than 6% lower than they are supposed to be then the capacitor is weak and needs replaced. If you read 0 (zero) then the capacitor is bad and needs replaced.


shamoke_15.jpg Full sized image

Jun 25, 2011 | Mitsubishi MSZ-A15NA Split System Air...

1 Answer

My outside condensing unit fan will not move without a push with a stick. It will work for a while and then stop. could this be the relay?The brand is GE Industrial Motor Model # 5KCP39EGT974S and the unit...


You fan motor either needs a new capacitor or the motor is bad. Most of the time it will be the capacitor though and if you have the tools you can test it yourself.

*CAUTION* Capacitors hold a largeelectrical charge and will discharge upon contact with your skin. This isenough to stop your heart and cause death. If you are not confident of yourabilities around these devices then please leave any testing or repairs to aprofessional. The capacitor is inside the unitand you have to remove the cover to see the inside of the electricalcompartment. You will need to discharge the capacitor before you start workingaround it. To do this take a screwdriver or other long metal tool with aninsulated handle and cross the three terminals on the capacitor to ground. Youthen remove the wires to the capacitor terminals, taking note of which wiregoes to which terminal. Capacitors are rated in MicroFarads (marked by a µF symbol) and a dual capacitor, shown in the image, willhave two ratings listed like this "35/5µF" or something verysimilar. You must have a multimeter thatreads micro farads to check a capacitor. You do that by placing one probeon the C or COM terminal and the other probe on the FAN terminal and it shouldread the small number of the rating, for example if your capacitor is ratedlike this: 30/7.5µF then the fan rating will be the smaller of the two numbers.In this case the 7.5µF (seven and a halfMicro Farads). The HERM terminal is the one for the compressor and will berated the higher of the two numbers, I.E. the 30µF on the capacitor. Check themboth and of they are more than 6% lower than they are supposed to be then thecapacitor is weak and needs replaced. If you read 0 (zero) then the cap is badand needs replaced.shamoke.jpg

Jun 18, 2011 | GE Heating & Cooling

1 Answer

Ducane Furnace; AC condenser runs but blower fan in furnace won't turn on


The blower motor could be bad or the motor run capacitor may be bad. If you have the proper tools you can test the run capacitor yourself and replace it.

***CAUTION*** Anytimeyou are working on or around electricity you run the risk of shock and ordeath. Please consider consulting an expert before you open an electrical panelor appliance. ***CAUTION*** Capacitorshold a large electrical charge and will discharge upon contact with your skin.This is enough to stop your heart and cause death. If you are not confident ofyour abilities around these devices then please leave any testing or repairs toa professional. The capacitor is inside the unitand you have to remove the cover to see the inside of the electrical compartment.You will need to discharge the capacitor before you start working around it. Todo this take a screwdriver or other long metal tool with an insulated handleand cross both terminals on the capacitor to ground. You then remove both wiresgoing to the capacitor terminals, which on fan motors are typically brownwires. Capacitors are rated in MicroFarads (marked by a µF symbol) and have a voltage rating as well which istypically 370 volts or 440 volts. Youmust have a multimeter that can read micro farads to check a capacitor. You do that by placing one probeon the one terminal and the other probe on the other terminal and it shouldread the number of the rating, for example if your capacitor is rated likethis: 7.5µF then the fan rating should read 7.5µF (seven and a half MicroFarads). If the reading is more than 6% lower than it is supposed to be, thecapacitor is weak and needs replaced. If you read 0 (zero) then the capacitoris bad and needs replaced. Take the old one with your to match up at your localhvac supplier. A typical motor run capacitorrated at 5 µF +-6% at 370 Volts ACshamoke_0.jpg

Jun 18, 2011 | Heating & Cooling

1 Answer

The outdoor fan is turning slow. it sounds like the compressor wants to kick on but it wont. the motor is really hot. what could this be


Sounds like a bad capacitor for your fan motor. You can test that by following the procedure listed below.

***CAUTION*** Anytimeyou are working on or around electricity you run the risk of shock and ordeath. Please consider consulting an expert before you open an electrical panelor appliance. ***CAUTION*** Capacitorshold a large electrical charge and will discharge upon contact with your skin.This is enough to stop your heart and cause death. If you are not confident ofyour abilities around these devices then please leave any testing or repairs toa professional. The capacitor is inside the unitand you have to remove the cover to see the inside of the electricalcompartment. You will need to discharge the capacitor before you start workingaround it. To do this take a screwdriver or other long metal tool with aninsulated handle and cross the three terminals on the capacitor to ground. Youthen remove the wires to the capacitor terminals, taking note of which wiregoes to which terminal. Capacitors are rated in MicroFarads (marked by a µF symbol) and a dual capacitor, shown in the image below,will have two ratings listed like this "35/5µF" or something verysimilar. You must have a multimeter thatreads micro farads to check a capacitor. You do that by placing one probeon the C or COM terminal and the other probe on the FAN terminal and it shouldread the small number of the rating, for example if your capacitor is ratedlike this: 30/7.5µF then the fan rating will be the smaller of the two numbers.In this case the 7.5µF (seven and a halfMicro Farads). The HERM terminal is the one for the compressor and will berated the higher of the two numbers, I.E. the 30µF on the capacitor. Check themboth and of they are more than 6% lower than they are supposed to be then thecapacitor is weak and needs replaced. If you read 0 (zero) then the cap is badand needs replaced.
Typical dual run capacitor C terminal is common, HERM terminal is compressor and FAN terminal is for fan motor.
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Jun 18, 2011 | Heating & Cooling

1 Answer

I have a busted 0.77mfd capacitor in my samsung microwave oven. there is only 1 capacitor available in town here in our place. its a 0.9mfd capacitor. is it ok to use this rating? if not, please help me...


If the 0.77 micro-farad cap has a tolerance of +/- 20%, then you're ok. But a tolerance of
+/- 10%, +/- 5%, or +/- 1% would exclude the 0.9 micro-farad capacitor as a replacement.
The tolerance colors that qualify are black and gray, see the capacitor color code reference at:

http://www.electronics-tutorials.ws/capacitor/cap_5.html

Mar 26, 2011 | Samsung Ovens

1 Answer

I would like to connect a pressure switch to the motor starter


hi! there, single phase compressor motor need a starting capacitor base on the rated capacity in horse power,you can check this on the tag of the compressor motor how many horsepower was indicated,it should be for single phase motor starting capacitor has a capacity of micro farads.for a 1 horsepower = 15 to 18 micro farads stating capacitor if you have more than 1 horsepower you can basically proportion the value of capacitor you need or ask the dealer how much capacitor you need on your motor the connection of pressure switch with a four terminal should be connected both on common line L1 and running capacitor line L2 .if you open the cover of pressure switch there are 4 terminals,2 terminals are connected when normally close or no pressure they connected on series connection on the common line one terminal connected to common line of the compressor and the other terminal on L1 to the pushbutton switch to L1 supply line.the 2 other terminals also connected in series withe line capacitors L2 to yhr power supply line.hope this will help you a lot.just rate my fix thanks a lot.

Apr 20, 2010 | Air Tools & Compressors

1 Answer

Blower motor doesn't start with capacitor installed!


you need a meter that will measure uf (micro farads) it should read within about 10% of the rating 12.5uf otherwise you could charge it with an insulation tester (megger) and short the terminals with an INSULATED screwdriver to see if it discharges.

Dec 21, 2009 | Goodman CKL24AR24 Air Conditioner

1 Answer

My nutone attic fan 69nr does not turn on


Hello

Check power from the t-stat to the motor or relay depending on how yours is configured for control voltage. If power is present at the motor. You will need a meter that can read amperage, take a ampdraw on the leads of the motor. See what this reading is, on the motor there should be a rating for LRA (locked rotor amps) if the amp draw exceeds this reading your motor is bad. You may also have a split phase capacitor installed which helps start the motor is so and you have a meter that reads in micro farads you could check the capacitor. the symbol for mico farads looks like a uf. Just make sure you discharge the capacitor to ground with a screw driver or insulated tool, if not it will shock you severly. Another thing you might look for is a reset button on the motor. Most likely this will be a red button somewhere near the bottom side of the motor.

May 29, 2008 | Broan-NuTone N-RF69NR Attic Fan Attic Fan

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