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ceiling fan 3 way switch

Discussion in 'Electronic Basics' started by Paul Mars, Oct 21, 2006.

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  1. Paul Mars

    Paul Mars Guest

    I am looking for a schematic for a fan manu. "A.C. Ceiling fan". I need, but
    can't find on the net.
    Can anyone help?

    Fan does not work, I suspect the switch is broken, but do not want to buy
    another until I test the fan/switch.

    there are two caps that are connected to the switch. The switch has 4 wires.
    The 2 power wires go into the top of the motor unit and come out the bottom
    along with 4 other wires. The black power wire goes to one side of both
    caps.

    tks,
    paul
     
  2. Use your voltmeter to measure on the motor side of the switch, in all
    its states. If you don't see 120VAC, then the switch is bad.

    JM
     
  3. Paul Mars

    Paul Mars Guest

    thanks. Three speeds plus off, so 4 position switch. Each of the four
    positions has 120vac on one or more of the motor side of switch. Two of the
    four positions have the same output leads high. That's with just the red
    connected to the switch. The red comes from the white wire thru the
    directional two position switch. However when I re-connect the black to the
    switch then neither of the other two leads from the switch are high. Also
    there is no voltage between the red and black while connected to the switch,
    and the motor is humming, but not turning. When I disconnect the black and
    red from the switch then I get 120 between them.
     
  4. Sounds like bad motor to me.

    What should be going on there is that, depending on which of the 3 "ON"
    positions is selected by the switch, a different set of motor windings
    is selected. Rather than add resistance to the circuit, & generate
    heat like with a DC motor, different windings give different speeds.
    That's why I asked about the voltages between the switch & motor. If
    the switch was bad, there would be no voltage between switch & motor.
    Also, it's possible that 1 or more speed might still work. The humming
    motor, not turning, isn't good.

    JM
     
  5. I would suspect the capacator. Cheap, $2 to $5 if you have an
    electrical supply dealer nearby.
    Dave
     
  6. Paul Mars

    Paul Mars Guest

    I just cut and touched some switch wires and I got the fan to spin. So, I
    think I can hardwire for single speed. Your thoughts?
     
  7. Be clear about this. The extra windings add series inductance which drops
    the effective motor voltage and hence the speed. This works like resistance
    or capacitance but it is easier and cheaper to do, although series
    capacitance now has come into favor.















    ....
     
  8. Sounds like 1 or more of the windings are shorted. If single-speed is
    OK with you, wire it up as it works.

    JM
     
  9. Right. My point was that there isn't some sort of variable-voltage
    speed control in front of the motor.

    JM
     
  10. Paul Mars

    Paul Mars Guest

    I am trying to fugure out how this fan worked and I am lost. The four wire
    switch had red power and the black common both connected to it. Why?

    Also the other two connections on the switch went to the two caps. The other
    side of the caps were connected and went to the fan. Does that make sence?
     
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