Beer Tower fan / Fan not working properly

[Pdaigle]

bought a fan (http://www.ebay.com/itm/1pc-Delta-TFB0612GHE-12V-1-68A-DC-Fan-60mm-x60x38-NEW-/180673009678?_ul=BR) with sensor and I cut every wire below the small plug including the sensor. I wire the red and black and they only wire left was the yellow(ground). The fan start but it 1 second on and 1 second off continuously. Is there something Im doing wrong? Should I've kept the sensor somehow?

 

[jddevinn]

Are you using an AC or DC supply? From the manufacturer supply should be 5-13vDC

 

[day_trippr]

fwiw, the yellow wire is not "Ground".
It's either a tachometer output, or a speed control input...

Cheers!

 

[Pdaigle]

Are you using an AC or DC supply? From the manufacturer supply should be 5-13vDC

its DC Im pretty sure but I will double check. I'll even attached a pic. thx

 

[Pdaigle]

fwiw, the yellow wire is not "Ground".
It's either a tachometer output, or a speed control input...

Cheers!

does it matter if its not used? what should I do with this?

 

[crane]

does it matter if its not used? what should I do with this?

If it is the speed control wire then yes it does matter. Some fans have a minimum PWM duty cycle and grounding it will cause the fan to stall, where it will continuously start and stop like what you are seeing. Other fans that don't have a minimum duty cycle will run at their lowest speed when tied directly to ground. The speed control wires have an internal pull up resistor in the fan so leaving the wire unconnected will let it run full speed.

Either way there is no need or reason to connect it to ground.