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PWM using MyDAQ on a 4 wire Fan

Hello,

I am in the process of trying to learn Labview and I am hoping someone may be able to guide me in the right direction with my following query.

I am following the NI tutorial located on http://www.ni.com/tutorial/2991/en/ which covers PWM.  I am now trying to control the speed of a fan (Delta Model No. PFC0612DE-F00) which is a 4 wire fan and allows for PWM.  I have the fan connected to an external 12v supply, I have the yellow lead (PWM control lead) connected to DIO 3.  By varying the duty cycle I can change the speed of the fan but only slightly.  Would anyone know what I need to do to get a greater speed control.

 

Thank you 

Éanna

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