Question about Dayton Universal Ac/Dc Open Motor 1/5 Hp 10,000 Rpm 115V Rotation 2M139

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Can i control the speed of this motor with a ac light dimmer switch?

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No . with out getting to complicated the motor is designed to operate at 60hz witch is the frequency the voltage is delevered to you at. A dimmer switch changes voltage (lowering voltage it dims your lights) lowering the voltage to a motor will raise the current (amps) create heat and kill the motor and probable the switch. Good news is you can purchase fairly cheap VF (variable frequency) drives that will do what ever you want word of caution running a motor at 30Hz or less (half speed) the motor will probably require an additonal cooling fan since its internal fan will be turning to slow to be effective
good luck

Posted on Oct 06, 2009


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Where can I find a weatherproof dimmer switch for my outdoor pond pump....yes it is variable speed.

You need to get the appropriate box and cover. I have never seen a weatherproof dimmer switch. Also normal dimmer switches do not work very well with motors so I am assuming this "dimmer" is for motor use.

My 3-speed ceiling fan is connected to an on/off wall switch that turns it on and off but the pull chain does not control the speeds. It is stuck on slow speed. I tried replacing the pull chain switch in...


Guess what? A standard dimmer switch will not properly operate a fan motor. In fact, it’s most likely going to damage the fan motor and it could even potentially cause a fire. I’ll admit I even went out and bought a dimmer switch and I sat down to just “make sure” I was doing the right thing when I figured this out.
Standard dimmer switches are designed for the wattage of lights. Fan controls are designed for the amperage of the fan motor. So if you want to control the speed of a ceiling fan make sure you buy a fan speed control that specifically says it works for fans. Fan controls come in quite a few styles. The most common type has been around for quite some time and that is the rotary or dial type. The next most common fan control I found was the toggle that has three pre-set speeds (slow, medium and fast). You can also get a fan control that has a slider control along with a toggle switch.
dimmer+switch.jpgThe type that I want to install is a toggle switch with a small slider switch next to it. I have a feeling I’ll have to order one of these but I’ll check with my electrician tomorrow to find out the scoop. The bottom line is you can’t use a standard dimmer switch to control a ceiling fan. You have to get a fan speed control switch that is specifically designed to operate fan motors.

the short wire leads coming from the switch should be attached to other wires with small wire nuts. Just unscrew the wire nuts, unscrew the finial type cap that holds the switch in place, remove the switch and take it to the store. If your lights are strictly "ON"-"OFF" there should be just two wires from the switch. If your lights are controlled - "One" "TWO" or "THREE" at a time the switch will probably have three wires coming from it.

Thanks for contacting Fixya.

No power from switch to light fixture

I'm an electrician and can help you with this problem. Assuming that this dimmer was installed correctly because it had been functioning properly earlier, the short answer is that the switch has failed.

Dimmer switches are solid state devices, not unlike a modern stereo receiver. Like the receiver, it uses components called transistors and rectifiers to control power that can and do eventually fail. Installing lamps with a total wattage greater than the dimmer is designed to operate will cause it to fail prematurely. Most dimmers are rated for 600 watts, unless marked otherwise. Dimmers are used to control incandescent lamps (those with a filament - unless a compact fluorescent lamp package states it can be dimmed) only. Dimmers are not suited to control the speed of a motor (as is often found in the case of a ceiling paddle fan / light fixture). Use of them in this way creates excessive heat at the motor that can cause a fire.

If you are trying to use the dimmer in these conditions detailed above, it will be a cause for premature failure. Likewise, accidental shorting of the output of the dimmer will cause it to fail instantly.

You will likely need to replace the switch with a dimmer or standard toggle switch to gain control of the load again. If after correcting an excessive wattage load or removing a motor from the output of the switch - and trying a dimmer again, be sure to shut the power to the switch off before wiring and follow the instructions.

If you are installing this dimmer to replace and existing switch or dimmer, please provide more details including the switch manufacturer's name and model, the type and size of load being controlled, number of wires, etc.

I hope this helps & good luck

Installing a Lightolier 600VA general inductive dimmer switch.

Hi James, I'm an electrician and can help you with this problem.

From what you describe, the wiring in the switch box is for a standard, single pole switch or dimmer, and is not compatible with this replacement switch. Here's why: you stated that there are (2) wires in the box, a black and white insulated wire, that once fed a dimmer switch. Common wiring practices would suggest to most electricians that the white wire is the 120 volt "hot" supply and the black is the switched leg - or output of the switch to the fixture.

The replacement inductive dimmer switch is not a standard switch. It is designed to control inductive loads - or motors such as a fan. It does not simply control the flow of current - but actually uses a small amount of electricity to do this. This means it needs a complete 120 volt circuit consisting of a neutral and hot wire; and wire for the output of the switch to the motor. A total of insulated 3 wires. You have only two.

If you have a neutral in the box, you can use the switch if wire like this:

120 volt "hot" to the switch Black
120 volt "neutral" to the switch White
120 volt load wire (to motor) to the switch Red
The switch Yellow should be taped or capped off and is used only in a three way application.

The "arm switch" cuts power and the wheel is used to set low speed setting. You can see the info sheet here.

As mentioned above, this switch is used to control a motor - not a light. The same way a dimmer is used to control a light - not a motor. If you do not have access to a neutral in the box, you should either install one or, use a different switch. There are motor speed control switches that do not require a neutral wire and cost under $25.

If you need to control both light and fan there are products that are installed in the canopy of a paddle fan that will do this for under $50 and are operated via a wireless remote that can be secured to the wall such as those below:


These can be found at Home Depot, Lowes, and electrical supply stores.

I hope this was helpful & good luck!

Wiring Question

No, the way the motor speed control works is different from the way a light dims. If you connect it, it might work for a while, but it will either burn up the dimmer or the fan motor.

Can you change a motorguide 65lb thrust foot control model with fix speed settings to a variable speed

well a "Speed Controller" can usually be used on ANY DC/AC motor, depending on type, some motors just will not work, with a speed controller... Think of it a bit like a "Light Dimmer", with the "Bulb" being the "Motor"
Have a look below for info.

Can i put a dimmer switch on a floor fan? i just bought an industrial-type floor fan, but i don't need that much air movement all the time, how could i wire up a dimmer or potentiometer so that i could...

A potentiometer would overheat because when you tell it to turn the power down, it basically just runs the extra power through a heating element, which will probably catch it on fire for something that large. A dimmer switch changes the voltage that goes in, and is generally meant for incandescent lights. If you wired a regular old dimmer switch up, the motor would probably sound weird, and the dimmer switch or motor would break, possibly starting a fire. It's illegal to use a regular light dimmer switch on anything but an incandescent light socket. However, you can easily find a controller that will work. Look for a fan speed controller or motor speed controller. Make sure it's rated for the correct voltage and has an amp rating not exceeded by the fan's rating. These look like a dimmer switch but are designed to deliver the power the motor needs. See link

I installed 2 industrial ceiling fans with 5 speed controls but my customer want the fans to rotate slower than the lowest setting. Could I install an ordinary lighting dimmer switch either before the...

A regular dimmer switch will not do what you want.  A variable speed switch similar to a dimmer but made specifically to control motor loads may do what you want.  I think it would have to be installed after the 5-speed controller because the reduced voltage may cause problems for that controller.  Maybe you should just replace the controller with a the variable speed switch.

Want to install Fan and light control from one switch.

'define control'

anyway, that all the lights work together makes it simpler

most fanlights, updated by homeowners replace a lamp only unit, with on/off provided at the switch, and cable pulls on the unit to change speed direction of the fan

my favorite is paired dimmer switches, giving control separately of light and fan speed, fan direction still changes on the pull switch, requires 3 wires in the switch box, (power and 2 switched lines), to the lamp connector and fan motor connector, any sparky can pull the extra line with fishtape along the existing cable run. easy peasey.
Really good electricians pull three wire to light circuits, when the house is built or reno-ed. but you know how oftern that is gonna happen, 3 wire costs 3c more per foot, if there is 3 wire in the switch box -your home and hosed

or just for speed/dimmer control a dimmer switch can replace the existing single switch. but you still have to pull the cords to start the fans

its easy, with the caveat that you may kill yourself, or someone else, or burn the house down, if you dont do it right
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