Trying to figure out the pinout of these fans, tried testing randomly touching + & - to a molex, but nothing seemed to get these spinning so far.
Anyone know? Typically on fans the first 2 on the left are neg then positive, but Im not sure thats the same for these bc it didnt work for me.
One wire has a red mark on it, but it also says PWM close by so I didnt wanna risk using that as + and burning the circuit before I found a definitive answer.
Looks like an ordinary 4pin PWM.
1 - 2 - 3 - 4
GND - 12V - Sense - Control
In the last picture, 4th contact point has PWM next to it and the 1st contact point looks like a upside down G to me aka Ground.
Are there any other markings on the PCB next to those two center contact points? C/V/P for Current or Voltage or Power etc, S or T for Sense or Tachometer. And don't want to sound rude but are you sure you tried to power it with the 12V pin from the 4pin molex and not accidentally with the 5V pin
Are there any other markings on the PCB next to those two center contact points? C/V/P for Current or Voltage or Power etc, S or T for Sense or Tachometer. And don't want to sound rude but are you sure you tried to power it with the 12V pin from the 4pin molex and not accidentally with the 5V pin
O/P- yellow wire- feedback
VM / PWM- speed control of the fans. These are controlled by varying voltage, and you can just connect it to the + wire and use these as 3 pin fans. They won't move if you don't connect it.
G - black wire- negative (-)
VCC- red wire- positive (+)
When run as 3 wire fans, they can be speed controlled by putting them in DC mode.
O/P- yellow wire- feedback
VM / PWM- speed control of the fans. These are controlled by varying voltage, and you can just connect it to the + wire and use these as 3 pin fans. They won't move if you don't connect it.
G - black wire- negative (-)
VCC- red wire- positive (+)
When run as 3 wire fans, they can be speed controlled by putting them in DC mode.
I have a Delta 120x38mm fan that works this exact way. The pin that controls fan RPM needs 12V to run at full speed at less than 12V it throttles down to lower RPM's.
O/P- yellow wire- feedback
VM / PWM- speed control of the fans. These are controlled by varying voltage, and you can just connect it to the + wire and use these as 3 pin fans. They won't move if you don't connect it.
G - black wire- negative (-)
VCC- red wire- positive (+)
When run as 3 wire fans, they can be speed controlled by putting them in DC mode.
Sorry, but to clarify you are saying the VM/PWM is for PWM control signal. But if not using PWM to run 12v power to this connection?
Reason I ask is normally when using a PWM fan on variable voltage the PWM connection is not used at all.
PWM fans run on contanat 12v volt with no PWM signal .. same as a variable voltage fan at full load. Then just vary the voltage to change speed.
These will not run without this wire connected to power. Also, while labeled PWM, these fans actually use varying voltage along a 4th wire to control them, not a PWM signal. Weird fans they are.
Quote:
Originally Posted by doyll
Sorry, but to clarify you are saying the VM/PWM is for PWM control signal. But if not using PWM to run 12v power to this connection?
These will not run without this wire connected to power. Also, while labeled PWM, these fans actually use varying voltage along a 4th wire to control them, not a PWM signal. Weird fans they are.
Mostly, but these fans cannot run off of a normal pwm signal.
Connect the PWM labeled wire to the + wire and call it a 3-pin fan. Works for me, fully variable speed.
The PWM wire does not work the same way a standard yellow PWM wire on most fans/PWM header pin on mobo's.
I had to sacrifice one but I did get it to work, thank you. Hopefully this thread will save anyone from sacrificing more of these cute fans in the future to find out how to power them
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