I have two T35696-HP cooling fan motors from an HP C7000 server rack. I am going to use the motor/fan with a DC source outside of the normal capacity as a cooling fan for a server. Therefore, I am not going to be using the existing circuit board that controls the motor.
I have not been able to find any schematic for the circuit board for this cooling fan. Because of this I am having difficulty knowing what wires coming out of the fan motor do what. There are only three (3) wires coming out of the fan motor. Blue, Yellow, Red. I am assuming the Red wire would be power but I would expect to see a Black wire for ground. There is not one.
Since the fan is wired to the circuit board and the board is plugged into a computer slot, I am running under the assumption the ground was somehow handled within the circuit board itself. If that is so, could I simply ground the motor housing if running directly to a power supply?
I plan to wire this motor up to an external 12 V power supply and a controller that will control the speed of the fan. I would like to know what wires to use for 'power', 'ground', 'control'.