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Electric fan circuit...is it flawed ?

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Twister
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PostPosted: Sun Jun 15, 2014 13:04    Post subject: Reply with quote

Simplest way for me to incorporate an override would be to take the feed for switch 2 from a permanent live instead of from the switched side of switch 1. Just means I'd have to make sure both switches are in the "OFF" position to isolate the fans.

The other way would be to run a cab switched live feed to the white wire on the back of switch 1, effectively giving the option of auto / manual (sensor feed / permanent feed), and still keeping switch 1 as the master kill switch.
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PostPosted: Sun Jun 15, 2014 13:04    Post subject: Google Ads keep this community free to join!


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Matt Quinn
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PostPosted: Sun Jun 15, 2014 13:32    Post subject: Reply with quote

Uh-Huh...  

Which negates nothing I have said in terms of a) there being no point to adding the complexity (it's just another thing that can break)  or b) it being (in general) bad practice to have a 'kill switch' (for any purpose) that requres to be energised in order to operate...

And, incidentally... People have been badly injured by 12V systems. They're due no less respect than those that operate at higher voltages.

I had a study-mate at college whose favourite trick was floating his glass eye on top of his pint...  That and his badly pock-marked face were the result of accidentally dropping a socket bar directly across the terminals of a 12V Lead-Acid battery...  Which exploded!  

In other news, I know of an SNG Truck (outside broadcast vehicle) which was reduced to a very sorry state after some 'clever' person decided to 'rewire' the vehicle's engine/running electrics (these things have dual alternators etc) to 'better charge' the 12v systems that ran the inverters etc...  Quite a spectacular fire it was apparently!  - I was involved in what you might call the 'post -mortem' (no people, only £250,000 worth of kit was destroyed).  And on interviewing the 'technician' responsible, and looking at the 'modifications' he'd made, it was obvious he was flying completely in the dark...  Loads of pointless relays in that particular mess as I recall!  

Back to the fan system...

Override...  Your circuit is fine as it is...  

To override the sensor all you need to do is take a live feed via a switch ( a lighty-up one in orange is good Wink )  Either to termial 85 of Relay 1  - in which case your override will override the 'kill' switches (does that need to happen?) or to the terminal where the white wire connects to S1...  In which case your kill switch will override the override!  

I really don't think it will be necessary but there is just the very slightest possibility in that set-up that a blocking diode might be needed in the line from the sensor; but really that is a very remote...
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Twister
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PostPosted: Sun Jun 15, 2014 15:55    Post subject: Reply with quote

Twister wrote:
The other way would be to run a cab switched live feed to the white wire on the back of switch 1, effectively giving the option of auto / manual (sensor feed / permanent feed), and still keeping switch 1 as the master kill switch.


Matt Quinn wrote:
To override the sensor all you need to do is take a live feed via a switch ( a lighty-up one in orange is good  Wink )................................................ to the terminal where the white wire connects to S1...  In which case your kill switch will override the override!



Snap  Confused
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Matt Quinn
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PostPosted: Sun Jun 15, 2014 16:18    Post subject: Reply with quote

Snap  Confused[/quote]  - Quite so...   Very Happy   But the more lighty-up swiches you have the better IMHO... Wink
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Twister
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PostPosted: Tue Jun 17, 2014 11:40    Post subject: Reply with quote

Right, the finished product......

Some may say it's over complicated, but it does mean I have full control over what the fans are doing, and know exactly which fan is running from the lights in the green switches, whether they're running off the sensor supply or the override supply.

I would have preferred to label the red switch "Auto / Manual", but the sticker sheet I've got doesn't have that on it, so "12v1 / 12v2" will just have to do for now  Laughing .





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Matt Quinn
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PostPosted: Tue Jun 17, 2014 12:03    Post subject: Reply with quote

Hmmm RED switch! Good choice  thumbup - Smaller fuses would be possible (arguably better - it's a moot point possibly) on your control lines to the relays...  But that all looks pretty sound to me.
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catherine
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PostPosted: Tue Feb 26, 2019 12:24    Post subject: Reply with quote

In either situation, however - Regardless of whether the sensor exchanged 12v coming through the transfer loop to 'earth' Or (as you have) exchanged 12v direct by means of the hand-off curl to earth... The present going through it is actually the equivalent. By and by; I can't envision an unencapsulated sender being 'something worth being thankful for' however in the event that it works... Swapping wires round on this will have no effect electrically.
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