[Amps] 4 wire EBM Papst fan but without using PWM

[Conrad PA5Y]

That does not answer my question, it shows a link to a lot of ways of 
how to implement PWM. I do not wish to have any potentially noisy PWM 
circuits I just want to know what to do with the PWM and tacho wires if 
I do NOT want to use them.

Regards

Conrad


On 08/01/2017 01:20, Ron Youvan wrote:
>    Conrad PA5Y wrote:
>
>> I have a couple of EBM-PABST 3254J/2H3P fans which have a 4 wire
>> interface. I do not want to use PWM and while they run with just the
>> positive and negative DC voltage applied they tend to change speed in a
>> random way when I run my amplifier without the PWM and tach wires
>> floating. How can I ensure that the fan runs properly without using PWM?
>> Can I just tie the PWM input high via a resistor and ignore the tach
>> connection?
>
>   see:
>
>
> https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1680&bih=834&q=four+wire+computer+fan+circuits&oq=four+wire+computer+fan+circuits&gs_l=img.3...4715.14290.0.15660.31.12.0.19.19.0.126.1050.8j4.12.0....0...1ac.1.64.img..0.23.1097...0j0i30k1j0i8i30k1j0i24k1.sYLU4-xnt2c 
>
>


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