Right, I think my twin electric fans aren't running right...

Re: Right, I think my twin electric fans aren't running righ

Good morning Dorian,

I don't recall what Amperage rating breaker you have current.
I would use a 200 amp @12 Vdc rated circuit breaker on the TT.
I can see what's. available after work Monday near me.
Make a list of all wiring materials you want Dorian.
I use a notepad and make a list of Goodies I want for a project.
Set you up with # 8 & #10 Gauge wiring. & Ring terminals.
You have plenty of solder & heat shrink tubing I know.
Rough out wiring length needs with a tape measure & a piece of string.
Short runs add 1 foot.
Long wiring runs over 6 feet add 2 feet .
Don't run short & have plenty extra to improvise & reroute if you have to.

Brian
 
Re: Right, I think my twin electric fans aren't running righ

Update: I let one of the fans run for a few minutes before getting home - I popped open the box and nearly burned myself of BOTH relays. Using my new laser temp gun :mrgreen: I read temps in excess of 190 F. On manual override of one, the other was randomly firing.

I have two 30 Amp breakers that automatically reset. I originally had 30 Amp blades that melted.

I can get the wiring and fittings over here - I guess I need the solenoid/relay and some kind of circuit breaker.

42137746-541E-4D81-B798-4A524E2D1792-1941-0000010DCC1FA5A6_zps262b407b.jpg
 
Re: Right, I think my twin electric fans aren't running righ

I will look for suitable circuit breakers for the TT.
 
Re: Right, I think my twin electric fans aren't running righ

Think I could run one of those resettable breakers like I bought for the battery? Problem is if the circuit breaks and I don't notice = > OVERHEAT?!

That is why I went with the auto reset for the fans...

Hmmm
 
Re: Right, I think my twin electric fans aren't running righ

What I don't understand is why can't these 60 amp relays handle these 20 amp fans?
 
Re: Right, I think my twin electric fans aren't running righ

DorianL said:
What I don't understand is why can't these 60 amp relays handle these 20 amp fans?
Click to expand...

Inductive loading.
EMF created instant fans turned on & then shut off.
E of I.
I am an electronics expert also.
My former career.
Some engineering background .
Not same extent as Grumpy has in mechanical engineering.

Brian
 
Re: Right, I think my twin electric fans aren't running righ

LOLOLOLOL. I'm a political scientist and quite clueless. So the current going through one relay is firing the other?
But why such heat?


Would it work if I simply kept the relay far apart from each other? I ask that rhetorically.

The auto reset breakers seem fine. Maybe that would work with one of the switches you showed?
 
Re: Right, I think my twin electric fans aren't running righ

DorianL said:
LOLOLOLOL. I'm a political scientist and quite clueless. So the current going through one relay is firing the other?
But why such heat?


Would it work if I simply kept the relay far apart from each other? I ask that rhetorically.

The auto reset breakers seem fine. Maybe that would work with one of the switches you showed?
Click to expand...

AAS In Electronics Technolgy 1990.
Really true here.
ASE Certified Master Mechanic.
ASE L1 Advanced Driveabilty Specialist.
ASE Master Machinist Gas & Diesel Assembly specialist.

4 Years on Car forums if you have followed me elsewhere posting.
Only 1 can keep up.......GRUMPY.

JUST CALL IT EXPERIENCE.
 
Re: Right, I think my twin electric fans aren't running righ

Lololol - that is indeed impressive... BOTH of you. :cool:
 
Re: Right, I think my twin electric fans aren't running righ

But then I suppose the little relays I am using cannot handle 20 Amp continuous???? (And lord knows what the peak Amp is)
 
Re: Right, I think my twin electric fans aren't running righ

Now the question that kill :)
How do he fix this EMF problem? capacitor across the fan motor? or something else?
I guess the emf are from the fan motor? not the circuit breaker wich probably have a very low inductance i am right?
This thing i never got it right lol.
 
Re: Right, I think my twin electric fans aren't running righ

mathd said:
Now the question that kill :)
How do he fix this EMF problem? capacitor across the fan motor? or something else?
I guess the emf are from the fan motor? not the circuit breaker wich probably have a very low inductance i am right?
This thing i never got it right lol.
Click to expand...

The most effecive method to eliminate EMF power spikes is to use a properly
designed PIE TYPE ELECTRICAL FILTER.
Its not practical to use on the TT.
Choke filter would be very large & heavy to handle 200 + amps peak current.
Likely weigh 50lbs alone.

Zener diode or Avlanche diode properly biased across both. fan motors a better option

Nicknamed a Clamping diode.
If Dorian don't want the 12VDC Magnetic pole relay I will use on my 87 vert.
Changing to a massive near 5 inch thick Griffin radiator & powerfull Flexlite fan.

Brian
 
Re: Right, I think my twin electric fans aren't running righ


Why don't you just mount one of these to your front bumper......
no relay, no wiring, no electrical no problem !!@!

oh-jesus-christ.gif





 

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Re: Right, I think my twin electric fans aren't running righ

87vette81big said:
mathd said:
Now the question that kill :)
How do he fix this EMF problem? capacitor across the fan motor? or something else?
I guess the emf are from the fan motor? not the circuit breaker wich probably have a very low inductance i am right?
This thing i never got it right lol.
Click to expand...

The most effecive method to eliminate EMF power spikes is to use a properly
designed PIE TYPE ELECTRICAL FILTER.
Its not practical to use on the TT.
Choke filter would be very large & heavy to handle 200 + amps peak current.
Likely weigh 50lbs alone.

Zener diode or Avlanche diode properly biased across both. fan motors a better option

Nicknamed a Clamping diode.
If Dorian don't want the 12VDC Magnetic pole relay I will use on my 87 vert.
Changing to a massive near 5 inch thick Griffin radiator & powerfull Flexlite fan.

Brian
Click to expand...



HELL YEAH, I want it!!!! I was just avoiding pressuring you. Just had one added question what should I use as circuit breaker? Or do I try with the 60 Amp auto-reset that I have?
 
Re: Right, I think my twin electric fans aren't running righ

;)
Give me till Friday night Dorian.
Pick out a suitable circuit breaker for the TT Cooling fans.
I am going to hand pick one out to my liking.
At least 100 amp rating. Have to look at inductive amp rating in each.
Pick up another 100 amp continous duty 12Vdc magnetic pole relay for ny 1987 Corvette convertible.
Finishing up projects this week.
1986 C4 Corvette Race Daul Stealth Areomotive 340X2 done. #10 AN 5/8 lines.
1948 Chevy 1 ton 5.13 geared rear differential will be done too soon.

Brian
 
Re: Right, I think my twin electric fans aren't running righ

Thanks for the reply Brian. I use one of the flex-a-lite fan me too good fan to me.
Rick thats more like 100 000 + cfm lol.
 
Re: Right, I think my twin electric fans aren't running righ

Real Jet engines are very Kool.
I see for sale on ebay. $10k to $50K only used. Some are NOS Military surplus.

Lots of exotic alloy metals used & highly precisioned machined parts down to. 1 millionths of an inch.
EDM machined parts.
Super ceramic composites used also.

Launch the TT & Dorian can fight off all Drones........ ;)
 
Re: Right, I think my twin electric fans aren't running righ

LOLOLOLOL :D :D :D
 
Re: Right, I think my twin electric fans aren't running righ

Bought the TT Daul cooling fan circuit breaker yesterday Dorian.
Extra heavy Duty. Auto Reset.
100 amp continous.
200 amp peak.
Post pics later when I am back home tonight.

Karma Ghia perfect for the wife.
You made the TT too fast for a normal person to drive.
Only a race car can keep up and pass you in TT.

BR
 
Re: Right, I think my twin electric fans aren't running righ

Karmann what? ;)
 
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