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Float switch

Post by DaveB on Fri Apr 13, 2012 6:14 pm

I designed and made a float switch to protect my main pump from running dry. Whch cuts in and out with a delay between. Using two cheap float switches and a contactor. Total cost £20. I fitted this almost 12 years ago and after cutting in/out every time I flush the vortex has finally give up the gost. I have just managed to get the parts of ebay and danfoss for £50( could probably get a cheaper contactor if shopped around and do the job for £30)I have tried to uplaod a wiring drawing but problems once again.Now where was that sticky on how to uplaod pictures again. Sorry for being a dimi

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Re: Float switch

Post by Admin on Fri Apr 13, 2012 6:26 pm

DaveB wrote:I designed and made a float switch to protect my main pump from running dry. Whch cuts in and out with a delay between. Using two cheap float switches and a contactor. Total cost £20. I fitted this almost 12 years ago and after cutting in/out every time I flush the vortex has finally give up the gost. I have just managed to get the parts of ebay and danfoss for £50( could probably get a cheaper contactor if shopped around and do the job for £30)I have tried to uplaod a wiring drawing but problems once again.Now where was that sticky on how to uplaod pictures again. Sorry for being a dimi

There Ya Go Very Happy

http://mio-chichi.forumotion.co.uk/t40-photobucket-tutorial

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Re: Float switch

Post by DaveB on Fri Apr 13, 2012 9:36 pm

[url=http://mio-chichi.forumotion.co.uk/a href=]http://illiweb.com/fa/pbucket.gif[/url]" target="_blank">http://illiweb.com/fa/pbucket.gif" border="0" alt="Photobucket">

Here is a drawing of the circiut for floar switch which mught come in handy one day. Hope it works

[url=http://mio-chichi.forumotion.co.uk/a href=]http://illiweb.com/fa/pbucket.gif[/url]" target="_blank">http://illiweb.com/fa/pbucket.gif" border="0" alt="Photobucket">I tried twice ?????

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Re: Float switch

Post by Admin on Fri Apr 13, 2012 9:56 pm

[
Here is a drawing of the circiut for floar switch which mught come in handy one day. Hope it works



1. Water level falls below upper float switch & contact A closes

2. water level falls below Lower float switch & contact B closes. The relay coil is energised which closes contact 1 & opens contact 2 and the pump stops.

3. When water level rises and lower float switch B opens . however the coil remains energised through contact 1 and float switch A

4 Water level continous to rise to normal level & upper float switch A opens & coil C is de-energised, contact 1 opens & contact 2 is once again closed & the pump starts.





Note The above method ensures that the coil is only energised whilst the pump is stopped and uses no power during normal operationie when the pump is running. The current through the float switches is only that of the contactor coil and not that of the pump

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