Relay setup for Taurus fan

bgreer · #1 08-19-2008, 09:25 PM

Justed uploaded a drawing of the relay setup that I am putting together to run a Taurus fan in my truck. My goal is to run the fan on low speed when a/c is on and have it switch to high speed when temp gets over 204. I don't want to ever run power to high and low speed at the same time. Would appreciate you electrical gurus taking a look at my drawing and give me your thoughts, particularly any way I could simplify it. I mocked it up this afternoon and got it to fit in a plastic box 2"x5"x6" so it will be compact enough. Reason for the complexity is that the Taurus fan uses over 60 amps when on high so am trying to minimize it's use. Appreciate your thoughts. Picture is in the bgreer album.

Thanks.

SSCULLY · #2 08-20-2008, 11:34 AM

This might sound like a dumb question.

Instead of making this mouse trap out of all those relays, how about you jsut get a Flex-a-lite controller that runs the fans at 60% for the 1st temp, and 100% at the 2nd temp ?

Flex-a-lite 33054, it is 95.00 + shipping, and solid state vs mechanical relays.

http://store.summitracing.com/partde...5&autoview=sku

For the drawing :

From what I can tell, this will work with the function you are looking for.

bgreer · #3 08-20-2008, 12:15 PM

Talked with the Flex-a-Lite techs and they flatly stated that they do not recomment their units on the Taurus fans. I like this controller if I wasn't using the Taurus fan. The only controller that I found that could hand the Taurus fan was the dccontrol controller. I purchased one and after 3 weeks it not only failed, it caught on fire!!!!!!!! Brian stated that the failure was caused by my bending the flange on the controller which caused the case to flex and it broke the power transistors. I'm not buying this as the unit worked for 3 weeks before failing. At any rate I want a setup that if it fails at least it won't catch fire. I am looking at a design that would run the fan on low when the a/c is on and I could manually switch on the high setting if it started to heat up. My design has a lot of failure points, temp controller 4 relays and the fusible link, that's alot of failure poitns. Will keep working on this and see if I can simplify it. Thanks for the response.