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Old 30th December 2015, 15:30   #231
FrenchMike
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Quote:
Originally Posted by Union Wheels View Post
Hi FrenchMike,

You have another satisfied customer in "rovertone".

I wonder if you could tell us what you did to solve the problem with his fan PCB.

Cheers, Pete.
Hi Pete ,

"Customer" is not the real term ;i am simply happy to share my old knowledges with everyone .

I guess all the 2 speed PCB's have the same feature :
Their Hi speed triggers at too high temperature (around 115 deg)


I'll confirm when rovertone will send it

Mike
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Old 10th January 2016, 17:02   #232
FrenchMike
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Happy new year to all of you .

I have tested the genuine Fan PCB Tony sent me
and found nothing wrong .

-It’s a genuine 2 speed with no faulty component

The results:

-Same test conditions as the 3 speed ,
in percent of duty cycle:
(I don’t know the exact correlation table between temp and duty cycle)

3speed genuine

Low 15%
Me 40%
High 70%

Tony' 2speed genuine

Low 15%
High 75 %


AFTER MODIFICATION for his peace of mind
(one resistor value changed)

Low 15%
High 65%

In these conditions Tony has measured:

1st Speed: On 97C Off 95C
2nd Speed On 110C Off 106C

So no Wonder that 75% could be 115 C or more ?

I have not yet received those from Steve ;I’ll confirm soon .(i guess)
If they have the same behaviour ...

Mike

Last edited by FrenchMike; 11th January 2016 at 16:52..
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