Fan speed controller - Electronics help

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Speedy88
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Fan speed controller - Electronics help

Post by Speedy88 » 14 Mar 2012 08:34 pm

Hey y'all,
My heater blow has stopped working. See the back of this there speed controller. The bottom 3 are all the 3 different inputs from the switch (technically the relay but lets keep it simpler). So each one is speed 1, 2 and 3.

The top connector goes to the positive on the fan motor:
Image

It gives different speed based on the resistance of the coiled wire. The highest speed - 3 - is closest to the output and therefore has less coil to go through. Less coil = more powarz and therefore higher speed.

Image

My question is - you can see the output (to the motor) is floating somewhere above the spring. It's very rusty. Is there a part missing? Can I fix this unit short of soldering a wire between?

Secondly, if someone has one of these I'd happily buy it off them :D

Cheers
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tim-andre
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Re: Fan speed controller - Electronics help

Post by tim-andre » 14 Mar 2012 11:58 pm

ive got a spare one, but it does not work on speed 1 and 2, since the coil thingy is broken, made it work for a while by making the bits of coil touch where they broke, works perfectly at 3 thou
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Speedy88
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Re: Fan speed controller - Electronics help

Post by Speedy88 » 15 Mar 2012 12:17 am

Cheers mate but I'd rather just jump the wires :lol: Can you tell which piece is missing on mine though?
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tim-andre
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Re: Fan speed controller - Electronics help

Post by tim-andre » 15 Mar 2012 12:20 am

i dont remember, can check that after work tomorrow :wink:
will upload some crapy mobile pic of it
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Chris_C
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Re: Fan speed controller - Electronics help

Post by Chris_C » 15 Mar 2012 12:32 am

I'm struggling to see from your pics bud, do these help?
http://www.flickr.com/photos/c_cardwell ... 121693593/
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Speedy88
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Re: Fan speed controller - Electronics help

Post by Speedy88 » 15 Mar 2012 01:01 am

That's weird, yours looks exactly the same too. Hmm, maybe I should just replace the unit. Yours looks really clean as well, where did you get it?
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macplaxton
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Re: Blower motor resistor - Electrical help

Post by macplaxton » 15 Mar 2012 05:18 am

Looks all there to me.

Whizz it over and I'll fix it. Don't whizz it over and I might remember to stick some pics up
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Speedy88
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Re: Fan speed controller - Electronics help

Post by Speedy88 » 15 Mar 2012 06:35 am

Sounds like an option :D

I still don't understand though. Obviously it doesn't arc accross that gap so how is the connection made?
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macplaxton
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Re: Blower motor resistor - Electrical help

Post by macplaxton » 15 Mar 2012 10:43 am

Speedy88 wrote:I still don't understand though. Obviously it doesn't arc accross that gap so how is the connection made?
Fairies!
Last edited by macplaxton on 16 Mar 2012 03:39 am, edited 1 time in total.
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Chris_C
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Re: Fan speed controller - Electronics help

Post by Chris_C » 15 Mar 2012 12:26 pm

What gap are you on about dude :p

The bimetallic?
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

macplaxton
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Re: Blower motor resistor - Electrical help

Post by macplaxton » 15 Mar 2012 02:03 pm

He means the TCO.

The entire unit is just two resistors and a thermal cut-out. There's nothing "electronic" about it. :roll: I'll get some pics up later.
Last edited by macplaxton on 16 Mar 2012 03:37 am, edited 1 time in total.
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Speedy88
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Re: Fan speed controller - Electronics help

Post by Speedy88 » 15 Mar 2012 05:56 pm

Hidden electricity! It's witchcraft I tells ya.

Ok cool then, makes more sense. May I whisk it over to you for a refurb then?
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macplaxton
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Re: Fan speed controller - Electronics help

Post by macplaxton » 16 Mar 2012 03:40 am

No problem and PM'd
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