Two stage fan cooling

[Discopotatoes]

David Beer said:

The first use of series to parallel switching for cooling fans, was to control air conditioning on trains, designed by a certain Dr Porsche.

YHM David

[Penelope Stopit]

Discopotatoes

I have drawn a diagram that will do a proper job. You may be interested
OK Edited the cock up




These 2 Fuses are main Fuses


These 5 x fuses, 1 at each of the relay coil terminals are 3 AMP safety fuses


These 3 x fuses 1 at each Fan Motor are to protect from short circuits or faulty Motors drawing too much current


For the correct rating of the Main and Fan Motor fuses, the fans need running and the current consumption measuring, now the circuits can be fused accordingly

The circuits aren't to be wired with fuses all over the place, all fuses go in 1 or 2 fuse boxes, the diagram layout is only for simplicity and easy viewing/understanding

Edited by Penelope Stopit on Friday 12th May 08:15

[Discopotatoes]

Penelope Stopit said:

Discopotatoes

I have drawn a diagram that will do a proper job. You may be interested

Thank you. P.S. much appriciated

can you clarify this bit I've highlighted please

Edited by Discopotatoes on Monday 6th February 21:04

[Penelope Stopit]

Discopotatoes said:

Penelope Stopit said:

Discopotatoes

I have drawn a diagram that will do a proper job. You may be interested

Thank you. P.S. much appriciated

Please don't thank me, I am addicted to drawing diagrams and you have helped feed my addiction, I thank you

[Hoofa]

Well did two stage cooling , about 4 lines of programming in the Motec PDM module, no.relays etc, Mind you there were some on here saying ooo don't fit one as it will be unreliable , utter rubbish

[Penelope Stopit]

Hoofa said:

Well did two stage cooling , about 4 lines of programming in the Motec PDM module, no.relays etc, Mind you there were some on here saying ooo don't fit one as it will be unreliable , utter rubbish

It's nice if you are able to control them like that
Discopotatoes can't use this method

Edited by Penelope Stopit on Monday 6th February 21:44

[Discopotatoes]

Penelope Stopit said:

Discopotatoes said:

Penelope Stopit said:

Discopotatoes

I have drawn a diagram that will do a proper job. You may be interested

Thank you. P.S. much appriciated

can you clarify this bit I've highlighted please

Edited by Discopotatoes on Monday 6th February 20:53

Yes I can clarify it's a cock up on my part, I hadnt saved my diagram and had forgotten to add safety fuses for those 3 relays so I edited the image with Photoscape
I will post a better one shortly

cheers it was the colours that got me, the red going to black.
also the bank of two relays have a small box which is the same symbol that each of the fans has. is this a connector or something else?

Edited by Discopotatoes on Monday 6th February 21:26

[Penelope Stopit]

Discopotatoes said:

cheers it was the colours that got me, the red going to black.
also the bank of two relays have a small box which is the same symbol that each of the fans has. is this a connector or something else?

Edited by Discopotatoes on Monday 6th February 21:26

OK I have posted a new image with an explanation

[Discopotatoes]

Penelope Stopit said:

Discopotatoes

I have drawn a diagram that will do a proper job. You may be interested
OK Edited the cock up




These 2 Fuses are main Fuses


These 5 x fuses, 1 at each of the relay coil terminals are 3 AMP safety fuses


These 3 x fuses 1 at each Fan Motor are to protect from short circuits or faulty Motors drawing too much current


For the correct rating of the Main and Fan Motor fuses, the fans need running and the current consumption measuring, now the circuits can be fused accordingly

The circuits aren't to be wired with fuses all over the place, all fuses go in 1 or 2 fuse boxes, the diagram layout is only for simplicity and easy viewing/understanding

Edited by Penelope Stopit on Monday 6th February 21:44

Thats brilliant thanks.
i love learning about new stuff and different ways to do it.
would the wiring also depend on the Amp draw in this instance or is there a standard?

[blitzracing]

Why so many relays? Five in total? it would make sense to use two or three pole units if you must use dropper resistors, (that still defeats me power wise as you are simply dumping around 5 to 6 amps of alternator power unnecessarily) then you could use only two and greatly simplify the wiring. If you are going to talk about single point of failure, you only have one otter switch per speed, which is is just as likely to fail as any relay. This is complete overkill in terms of complexity. Id love to see the rats nest of wiring in a TVR engine bay if you actually tried to wire it this way...

Edited by blitzracing on Tuesday 7th February 10:58

[Penelope Stopit]

blitzracing said:

Why so many relays? Five in total? it would make sense to use two or three pole units if you must use dropper resistors, (that still defeats me power wise as you are simply dumping around 5 to 6 amps of alternator power unnecessarily) then you could use only two and greatly simplify the wiring. If you are going to talk about single point of failure, you only have one otter switch per speed, which is is just as likely to fail as any relay. This is complete overkill in terms of complexity. Id love to see the rats nest of wiring in a TVR engine bay if you actually tried to wire it this way...

Edited by blitzracing on Tuesday 7th February 10:58

Saved

[blitzracing]

Nice you save all my posts- should prove useful for you in the future.

[Penelope Stopit]

blitzracing said:

Nice you save all my posts- should prove useful for you in the future.

Saved

[N7GTX]

Penelope Stopit said:

blitzracing said:

Nice you save all my posts- should prove useful for you in the future.

Saved

[David Beer]

Blimey,one two pole cross over relay for me , done 15 years!! Oh hi Mark the griff will be on the road in a few weeks, thanks to you.

[blitzracing]

Blimey things a have moved on a long way since then with the 14CUX. I did have to dig the data logger out to look at the Lambda outputs on an MGR that kept dropping power and you could see the mixture lean right off, so we knew it was fuel supply at least. How do you get dual speeds (assuming series / parallel) to work on just one 2 way relay? Ive never got it down to less than 3 relays.

[Discopotatoes]

David Beer said:

Blimey,one two pole cross over relay for me , done 15 years!! Oh hi Mark the griff will be on the road in a few weeks, thanks to you.

David did you get my email?

[Hoofa]

Motec pdm , no more relays, or fuses for engine control and fans

[ChimpOnGas]

Hoofa said:

Motec pdm , no more relays, or fuses for engine control and fans

^^^Love This^^^

It's the future and seems to me a an excellent way to massively improve the archaic and shockingly poor quality wiring TVR gave us.

If you ever want to sell your amazing supercharged fully sequentially injected and Motec equipped Chimaera Nigel give me a shout, I would love to feed it some LPG

[Matthew Poxon]

Hoofa said:

Motec pdm , no more relays, or fuses for engine control and fans

I like the look of that. Does that little box replace the whole fusebox?