Fan from server how to work ?

cowboybob said:

This is for the Nidec TA500DC A34538-90 CQ2 DC 12V Beta V series fans:
Minimum connections to get fan to turn:

Negative DC (Gnd) to Black or Blue wire (preferably the Black wire)
Positive DC (12V) to Red wire
PWM (Pulse Width Modulation) signal to Green wire (this is the signal that will actually make the fan turn at speed).
The rest are fan feedback signals which are not needed for this test.

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Nice info cowboy, but what actual signal is required into PWM so that Silver can get to know how to get the fan running. Is it a TTL level 1 or 0, or 0V or 12V for example, assuming a constant level will do that is?

spec

Silverfan said:

The most Fans are control over voltage,but how exactly voltage you need it was the miracle.
Standard voltage by PC are known and fan controls on Pc too. But Server Parts all any myterious.
Contact manufacturer (Server) for information they silence and give Link to manufacturer from Parts.
If contact manufacturer from Parts they silence too and they interest to know where your parts exist.
It´s buggy if need Informations over some Parts.
I hate this.

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Yes, I know what you mean about some manufacturers. They are simply not geared up for dealing with the public but, on the other hand, some companies couldn't be more helpful. Often, it depends on who in the company you get to contact.

spec said:

what actual signal is required into PWM so that Silver can get to know how to get the fan running. Is it a TTL level 1 or 0, or 0V or 12V for example, assuming a constant level will do that is?

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In this case, and not knowing for sure exactly what DC level of PWM the Nidec can tolerate, He ought to be able to very briefly hit the green wire with 12VDC to test the fan. It should, very quickly, run up to max RPM.

This signal isn't the high current driving force of the motor. Rather it's the "enabling" pulse (usually driving a transistor switch of some variety) that allows the full 12VDC (from the Black and Red wires) to be applied to the motor's stator coils.

Silver, here is an example of what a PWM signal looks like:

Note the shape (a square edged positive going signal) that has a sharp rise from 0 - max VDC followed by a similarly rapid decline for varying lengths of time. This energizes the motor's coils for increasingly longer periods of time (0% duty cycle through 80% duty cycle) which result in increasingly higher RPMs.

This is not unlike the signal used to drive a servo.

would mods please delete this post