PWM control wire

Support Q&A
1

------Question for 6314/2TDHHP Please Put your question below------

Can i know if i apply 0,2,5,volt on the pwm wire how the fan will act

2

Greetings,

The product catalog document contains information on the this topic on or around page 271, and the part number guide contains information on option codes.

The P in the part number suffix indicates a PWM-style input:

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3

Hello @farouk.h,

This piece may help you with control of a 4-wire fan.

It’s not the fan you mentioned, but you may be able to generalize the information.

Sincerely,

APDahlen

4

Thanks for your reply it’s really helpfull

I ordered the same fan with the same part number, but it behaves differently from the one that was originally installed.

The old fan (which has now stopped working) operated as expected:

At 0V → it was OFF

At 2.5V → around 40% speed

At 5V → full speed

However, the new fan does not respond the same way.

I’m not sure whether this unit is not original, has a defect, or if there is another reason causing this difference in behavior.

5

This the one that i received

Even the wires color are different than the Orginal

image-1775558862799
image-17755588627991920×1440 299 KB

6

Hello farouk.h,

The fans with the 4 wires, need a PWM signal to adjust the speed of the fan.

Just lowering the voltage on the newer fans, will not always lower the speed.

Some need a set voltage, and the circuitry sets the fan at a specific speed, unless adjusted with a PWM signal. The PWM signal is the only way I know to adjust the speed on these fans.

7

Sir

The voltage mentioned is the PWM signal not the power

8

Hello @farouk.h,

As I understand the part number, the “Type P” fan operates with a PWM signal. Ref the part number guide provided by @rick_1976.

You mentioned measured voltage in association with a PWM signal (0, off, 2.5 40%, and 5V full). There is some confusion as this is not the normal way to describe a PWM signal. Typically, we use an oscilloscope to measure the signal in terms of:

  • peak voltage
  • frequency
  • duty cycle

Without this detail, I don’t know how to interpret “2.5 V”. I’m not saying it’s wrong as a voltmeter could display 2.5 VDC when reading a PWM signal. However, without the other information I cannot draw a definitive conclusion.

On a related note, is it possible that this fan is not correct for your application. For example, the given analog values seem more appropriate for a “Type A” (analog speed control) or a “Type O” (multispeed control).

Sincerely,

Aaron