Question about Bionaire BSF1731RC Stand (Pedestal) Fan

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How are the windings connected to capacitor and speed control

How are the windings connected to the speed control and capacitor.

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Table fan winding&connection daigram


  • I have a Bionaire brand table electric fan.
    • It has a 3 speed fan motor.
    • The electric motor is a BM-122 Decomin brand 3 speed motor.
      • There are 6 wires:
        • Red wire.
        • Black wire.
        • White wire.
        • Yellow wire.
        • Gray wire.
        • Blue wire.
          • The motor has a 4mu 250volt capacitor.
  • This fan has an oscillating grill with independent sync motor, and timer circuit.
  • Something was wrong with the solid state circuitry (everything worked but the motor!), but a quick test of the motor indicated it does work.
  • The motor uses a start and run capacitor.
  • I decided to change controls to a simple mechanical switch and fore go for now anything beyond 3 speeds.
  • The printed circuit board shows the following connections:
    • Black wire
    • Blue wire
    • Yellow wire
      • Are respective for the:
        • High fan motor speed
        • Medium fan motor speed
        • Low fan motor speed
  • I think the gray wire goes out to the oscillator motor.
    • The Red wire is marked as Line, for the power source.
  • All wires are in continuity with each other EXCEPT RED is not with any other wire. How to Verify Fan Motor Wiring Connections
    • Checking the Motor and Capacitor Connections
    • Double check your connections using the fan wiring diagrams.
    • You should see that there is a separate motor winding for high speed.
      • The concern is that there is a capacitor for the motor.
      • So I'm thinking that the motor may have to start with the slower speeds first.
      • and not start in the high speed because the motor or capacitor has not been designed for that type of operation.

Sep 29, 2016 | Dryers

Tip

How to replace a run capacitor


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A Run capacitor has 2 terminals, they go to the Run and Start winding terminals, in this case the Line 2 leg of power is wired to the Run terminal on the run capacitor, that is due to the fact this is a single speed motor and speeds are on the Run winding, had there been 2 speeds, the Line 2 leg of power could not be wired to the Run capacitor but would be going to the High or Low speed terminals, conversely the Run terminal on the compressor can accept only 1 lead.
All electric motors get 1 leg of power directly to the Common lead, the remaining leg of power Always goes to the Run winding or speeds on the run winding if a multispeed motor.
Some compressors have a shared capacitor with 3 terminals, they share the leg of power to their Run windings however to Hermetic it will be say 30 MFD and to Fan it will be say 5 MFD, but as to capacitor theory they get Run and Start Always
Power can be wired to Run on the capacitor as long as the motor is a single speed.
But power ALWAYS goes to Common directly while the remaining leg of power goes to the Run winding or Speeds on the Run winding as in High and Low speeds.

on Oct 14, 2013 | GE 1 Pcs. Of 50uf 370v Ac Motor Run...

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.

jahn27.jpg

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.

jahn27_0.jpg


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

jahn27_1.jpg


jahn27_2.jpg



jahn27_3.jpg


jahn27_4.jpg

on Jan 11, 2011 | Dryers

1 Answer

Runs fine on low speed hums on high speed (turns slowly) is it a capacitor problem, internal windings or controller?


Motor itself is the culprit.

Capacitor helps the motor to start spinning from a dead stop, so NO, it is not a capacitor problem.

Probably high speed windings. Means - New Motor needed.

Another possibility, is the controller could be sending power to "Both" sides of the windings: High speed & Low speed at the same time. But normally when this happens, you hear a loud buzz type of sound, motor will spin slowly - if at all.

Good Luck

Mar 11, 2015 | Pool & Spa

1 Answer

Motor humms but wont engage


The start capacitor or start winding has gone bad. Or bearings are dry.
Don't run motor if it does not rotate full speed or motor will overheat and go bad.
Replace or repair motor.

Each motor has 2 winding circuits.
Start winding and run winding.
Both windings receive power same time.
Start winding has capacitor that releases sudden burst of electricity that starts motor rotation. Kind of like low speed on transmission.
Run winding then brings motor up to speed.
http://waterheatertimer.org/images/Motor-wiring-500.jpg
http://waterheatertimer.org/pdf/AO-Smith-motor-wiring.pdf

Nov 07, 2012 | Pool & Spa

1 Answer

Can i test run the fan motor by bypassing the capacitor


Maybe: If you can manually rotate the motor to get it started.
The capacitor is on start winding, and causes sudden release of amps that starts the motor.
There are two (or four) windings in each single phase motor.
Both receive power at same time.
One winding is the start winding, which can be considered 'low gear' on a transmission. The capacitor is on this winding and gives burst of enough power to begin rotation.
So when a motor just hums, and doesn't rotate, then the start winding and/or capacitor are suspect. Dry or worn bearings are suspect too.
The other winding is the run winding that brings motor to up to speed.
On fan motor, the run winding can have multiple connection points for selecting different speeds.
Illustration.
http://waterheatertimer.org/images/Motor-wiring-500.jpg

Nov 01, 2012 | Broan-NuTone Dryers

1 Answer

MY HUNTER ORIGINAL RUNS THRU AN ORDINARY WALL SWITCH. IT HAS HI AND LO SPEEDS ON THE HOUSING, BUT EVEN LO SPEED IS A BIT TOO FAST AT TIMES... HOW CAN I CONTROL THE SPEED THRU FULL RANGE... A RHEOSTAT...


Jim,

You have a special fan there. Hunter Originals are my specialty.

There are two ways to accomplish a slower speed with this fan.

1. A wall variable speed control, solid state, rated for 3 or more amps, regular fan controls will not work as your fan draws 2.5amps on high, not even new ones that are labeled for the Original.

2. Retrofit the fan to make it a three speed. If you're good with wiring, it's really simple. What you need is, a standard 3 speed pull chain switch, not a double pole one like cheaper/new fans have that use capacitor speed control, we are using cap. speed control, but not the same way they do. So you want an "SP3T" switch. You also need an 9 10 or 11 or 12 MFD capacitor (depending on how fast you want your low to be 8 is 20rpm, 11 is 75 approximately). You will remove the switch cap to your fan, and you will find your switch has a black, blue and red wire connected to it. Remove all wires, attach the black to L on your new switch, attach blue to 1, then you need 2 extra pieces of wire. Stick one wire in 2 and the second wire in 3. Now, get your capacitor and hook one side of it to the red wire and position 2, then hook the other side to the wire you put in position three.

Remember to get the Single pole switch for non capacitor speed control fans, if you get the double pole, both winding sets in your fan will be activated, which will draw double current and burn your motor out.

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Also, are you aware that your fan uses oil (like an engine) ? and is not permanently lubricated?

Jan 08, 2011 | Hunter Ceiling Fan Control Switch

2 Answers

My customer has a Thermador H26HQS range hood. When the fan motor became noisy, he obtained an identical replacement for the motor, which I installed. After installing it I noticed that the speed control...


The speed module is very simple: a triac with some extra components to modulate it, it's build exactly the same as the one from a vacuum. That speed module is controlled from the touch screen - are you sure the touch screen is operational? That's relatively easy to test - just put a potentiometer where the control signal goes and see if moving the potentiometer changes the speed.

Jul 07, 2010 | Thermador 30", 36", 42", 48", 54" Wall...

1 Answer

Wiring diagram for electricmotor with capacitor


I do not have a diagram for you, but depending on the motor, I can tell you a couple of things. 1. All capacitors are wired in series with the start winding. Most multi-speed motors, that require capacitors, have two brown leads, along with the motor winding leads. If this is the scenario, then just connect line power to neutral and the speed you wish to use, and connect the two brown leads, one to each side of the capacitor. Hope this helps.

Apr 01, 2010 | Heating & Cooling

1 Answer

Changed out blower motor on elect furnace.the old motor had three wires one fed the compaster.new motor is revirsable has purple wire,red,blue,black.hooked up purple 1st phase,red for high 2nd phase. is...


hmmm . you better check on that before firing it up ... normally the colored wires are for different speeds .. only one speed can be connected at a time .. usually the high speed winding is used for air conditioning and a lower speed winding is selected by a relay for heating .. ... the way the capacitor is hooked up determines which way the motor will turn .. your old motor with just 3 wires was probably a single speed motor .. normally the black wire will be connected permanantly to one phase .. the other phase then goes to the selected speed winding (color of wire) .. one goes to the starting capacitor . the others even if not connected will be hot electrically so need wire nuts to prevent shorts ..

Jan 03, 2010 | Dayton (2C373) Fan

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