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Help with a switching issue

Discussion in 'General Electronics Discussion' started by DaveClark, Mar 9, 2012.

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  1. DaveClark

    DaveClark

    2
    0
    Mar 9, 2012
    Hi all,

    I wonder could you help with an question I have?

    I have an extractor fan, plugged into a 13A socket.

    The 13A socket is controlled via a digital thermostat. (similar to this one)

    When the temp gets to high, the fan runs.

    When the temp drops below a given point, the motor stops. All this works great.

    However, I would like to change the operation so that when the thermostat circuit cuts power to the fan, instead of stopping, the fan idles.

    In order to make the fan idle, I have a variac available.

    Any ideas on how this could be connected? Would I need some kind of relay controlled switching circuit?

    Thank you for any advice you can offer.

    Dave
     
  2. mechtronics

    mechtronics

    153
    2
    Aug 7, 2011
    is the process working off all AC ?? or have u a electronic DC circuit controlling the thermostat which turns on a DC/AC relay to operate the fan??
     
  3. DaveClark

    DaveClark

    2
    0
    Mar 9, 2012
    There is probably a transformer in the thermostat device but otherwise everything currently runs on 240v AC
     
  4. mechtronics

    mechtronics

    153
    2
    Aug 7, 2011
    i was thinking could maybe u could incorporate a relay so that when the fan stops the relay would activate and could be connected to a dimmer switch varying the current and speed of the fan for idling??
     
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