...

Go Back   Lateral-g Forums > Technical Discussions > Cooling: Radiators/Fans/Controllers
User Name
Password



Reply
 
Thread Tools Display Modes
  #1  
Old 05-19-2018, 07:12 PM
*rayman*'s Avatar
*rayman* *rayman* is offline
Senior Member
 
Join Date: Apr 2005
Location: North QLD, Australia
Posts: 184
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via ICQ to *rayman* Send a message via MSN to *rayman*
Default PWM Controllers or Relays and circuit breakers

I've been looking for a more robust solution for my thermo fans wiring.

I currently have 2 x OEM ford fans in a shroud mounted up to a large alloy Desert cooler radiator. This radiator is cross flow, and quite a thick core. It definitely has the cooling capacity to keep the big block cool enough even through harsh summer in Australia. The fans are quite high CFM, supposedly about 3800. They pull heaps of air when they are working on high speed. They are a 2 speed fan, similar to the Lincoln fans a lot of you U.S guys resort to. The fans are currently wired on a relay each, with an inline fuse on each fan, operated by a manual ON/OFF switch. I've been melting fuses at 30amp, and have temporarily put 40amp fuses in. These fans are running on the high speed mode, and are pulling i believe right on about 30 amps. It would be nice to soft start them, or even utilise the two speed mode they are capable of, and only run them when necessary.

I bought a Derale 16749 fan controller, but have realised the 25amp continuous rating is not going to cut it. I planned to control 1 fan, with the option to switch the second fan on manually if required.

I recently missed out on a SPAL PWM-3 fan controller.

I've looked at the other various PWM fan controllers, but the reviews of some of these controllers really don't inspire me on their quality.

I came across these TRAC breakers, and thought that i might resort to manually operated with these breakers mounted up near the fans to have more idea of whats going on. Anyone used them and have any feedback?

https://www.tracoutdoor.com/shop/ele...it-breakers-3/

https://www.walmart.com/ip/Trac-12-V...eaker/40715420

Anybody used this guys stuff?
http://www.autocoolguy.com/home
__________________
68 BB SS Camaro - building it in Australia, where everything costs twice as much as it costs in the U.S.

Fuel prices suck!

Last edited by *rayman*; 05-19-2018 at 07:33 PM.
Reply With Quote
  #2  
Old 05-20-2018, 08:42 PM
GregWeld's Avatar
GregWeld GregWeld is offline
Lateral-g Supporting Member
 
Join Date: Jul 2005
Location: Sun Valley, ID
Posts: 20,292
Thanks: 240
Thanked 372 Times in 172 Posts
Default

So I don't have all the answers --- but would say this --- the START load on one of those fans on HIGH SPEED would certainly blow your 30 amp fuses....

I think your fuse size is not a big deal - but rather - either doing a soft start circuit ----- or starting on LOW speed and ramping to high...

Now --- the difference in PWM and "Two speed" to me begs a question for controlling.....


PWM is a variable speed controller

two speeds is two speeds

How were the two speeds controlled in the donor? Voltage?

I would think --- that the motors are just simply motors..... and could be controlled using PWM or just simple on/off switch or on/off/hi/lo. For hi/lo you just need to know the low V operation and the high V operation voltage requirement.

Since you now have a manual control ----- have you tried putting a variable potentiometer in the circuit and starting the fan at a lower speed??
__________________
'70 Mustang w/6" junk body - Tube chassis - 707hp LS7 oil pump - PPG 6 speed sequential trans - big aero - big tires.... Worst pile of crap and even worse looking, turd in the fleet. https://lateral-g.net/forums/showthread.php?t=56209 CHECK IT OUT! Have puke bucket ready! https://www.youtube.com/watch?v=VwPCd1Io3CI&t=9s And yes she could be a runner...... https://www.youtube.com/watch?v=AHku2sKqQBc&t=353s
Reply With Quote
  #3  
Old 05-20-2018, 08:56 PM
GregWeld's Avatar
GregWeld GregWeld is offline
Lateral-g Supporting Member
 
Join Date: Jul 2005
Location: Sun Valley, ID
Posts: 20,292
Thanks: 240
Thanked 372 Times in 172 Posts
Default

Forgot my #1 question!!!


So if everything works great with the 40A fuse.......

then you want to switch them automatically vs the manual you now have??

Or you want to run them with PWM??

Or you want to run them with two speeds??
__________________
'70 Mustang w/6" junk body - Tube chassis - 707hp LS7 oil pump - PPG 6 speed sequential trans - big aero - big tires.... Worst pile of crap and even worse looking, turd in the fleet. https://lateral-g.net/forums/showthread.php?t=56209 CHECK IT OUT! Have puke bucket ready! https://www.youtube.com/watch?v=VwPCd1Io3CI&t=9s And yes she could be a runner...... https://www.youtube.com/watch?v=AHku2sKqQBc&t=353s
Reply With Quote
  #4  
Old 06-07-2018, 10:09 PM
TheJDMan's Avatar
TheJDMan TheJDMan is offline
Senior Member
 
Join Date: Jan 2011
Location: Northern Virginia
Posts: 652
Thanks: 2
Thanked 2 Times in 1 Post
Default

Those Trac breakers look interesting. I have never seen them before. I like the auto reset feature. I would think that would be good for a fuel pump circuit.
__________________
Steve Hayes
"Dust Off"
68 Camaro
Speed has never killed anyone. Suddenly becoming stationary, that's what gets you!
"Jeremy Clarkson"
Reply With Quote
  #5  
Old 06-09-2018, 09:13 AM
ProTouring442's Avatar
ProTouring442 ProTouring442 is offline
Senior Member
 
Join Date: Feb 2005
Location: Lenoir City, TN
Posts: 1,281
Thanks: 3
Thanked 0 Times in 0 Posts
Send a message via AIM to ProTouring442
Default

What about this one?

The controller monitors your engine temperature via the radiator, therefore providing the most accurate reading for your cooling system. Using Soft Start Technology, fans ramp up slowly which eliminates harmful AMP spikes. The unit will continuously monitor your engine's temperature and operate the fans at the optimum fan rate as needed between 1 to 100%. The net result; the electric fans often only run between 40-60% to keep your engine cool. Additional benefits include, reduced fan speeds which means reduced fan noise, which tends to compete with that sweet sound of your engine!

This multi-fan controller has a built-in A/C Over-ride circuit and is designed to control as many 12 volt brushed electric fans as desired, up to 65 Amps combined.


https://derale.com/products/electric...n-probe-detail
__________________
Check out my blog and the latest installment of my current project "In the Company of Devils" at: www.WilliamKElliott.com
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:24 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright Lateral-g.net