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Force EK D5 PWM pump to spin at 100%

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solomonshv
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2016/05/23 01:05:32 (permalink)
Hello. 
 
i made the unfortunate mistake of buying an EK D5 pump, this one is PWM. the reason i say that is when it's only connected to a power source it will only spin at like 40% or something like that instead of 100% like all PWM devices are supposed to. i didn't know this before i bought it. 
 
i'm leak testing a new loop and don't want to power on the entire computer. but the pump can't seem to to even fill the loop at it's current speed. is there anything i can do to make go 100%?
 
thanks
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    MrImSoGood
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    Re: Force EK D5 PWM pump to spin at 100% 2016/05/23 23:14:43 (permalink)
    Are you sure it's not defective?
    Plugging it directly into the power source should make it run at 100%
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    solomonshv
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    Re: Force EK D5 PWM pump to spin at 100% 2016/05/23 23:21:31 (permalink)
    it should*, but it doesn't follow PWM spec. I confirmed with their customer support that it doesn't. their PWM pumps run at 40% when not plugged into a fan header and controller. definitely not defective. i have two of them. they both do the same thing. 
     
    i was wondering if there is a trick to get it to run at 100%. 
    post edited by solomonshv - 2016/05/23 23:25:44
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    Zuhl3156
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    Re: Force EK D5 PWM pump to spin at 100% 2016/05/24 06:14:28 (permalink)
    I searched high and low and there is no trick for this other than getting a breadboard, 555 timer and some other components to build your own PWM controller. In my youth I would have done this eagerly but not these days. Just double-check your fittings, bite the bullet and power it up. Remember to have plenty of towels handy. BTW, some motherboards might be different but sitting in BIOS my motherboard would only power the D5 pump at 40% until I reached Desktop in Windows.

     
     https://www.heatware.com/u/100032/to
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    solomonshv
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    Re: Force EK D5 PWM pump to spin at 100% 2016/05/28 14:55:54 (permalink)
    wow... yea, i'm not that handy. i will probably just put the thing together and do the flush with the system running. i did manage to get the entire loop filled by tilting the case in every position imaginable but the flow rate is still really bad. at 80% i'm sure it will be much better, and no leaks so far. 
     
    my asus x99 deluxe runs everything 100% on power up and only slows down to whatever i have configured into the BIOS after POST
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    ty_ger07
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    Re: Force EK D5 PWM pump to spin at 100% 2016/05/31 11:32:32 (permalink)
    Warning: I am not liable for any damage done if this doesn't work.

    But...

    If you plug 5 volts (red wire from molex 4-pin power connector) directly into the pump's PWM input pin, the pump should interpret that as 100% duty cycle and therefore run at 100%. 5v! Do NOT do that with +12v!

    In other words:
    Yellow +12v from molex connector into pump's power pin.
    Black ground from molex connector into pump's ground pin.
    Red +5v from molex connector into pump's PWM input pin.
    Nothing connected to pump's tachometer feedback output pin.

    That should work fine to force the pump to run at 100% unless they have added some goofy design in their pump. Maybe ask EK first.

    If you look at the PC PWM technology spec sheet, it says:

    A 100% duty cycle would be a constant 5V signal with this fan and Hardware Monitor device.


    A 555 timer should only be necessary when trying to create a custom circuit to force the pump to run at any speed other than 100% (needing to produce a square wave with duty cycle between 0% and 100%).
    post edited by ty_ger07 - 2016/05/31 11:43:50
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    ragevirusqq
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    Re: Force EK D5 PWM pump to spin at 100% 2016/05/31 12:03:41 (permalink)
    EK is aware of this and the newer versions of there D5 PWM pumps now run at 100% when no signal is detected. What does that do for us guys who already have the prev version? Nothing. 
     
    I wish EK would sell a custom cable to make these run at 100%. I saw on singularity computers you tube channel that he had the same issue when building out the razer h440 build. He made a cable like describe above and it worked.
     
     
    To remedy this in the past I have used a second PC(luckily i have a test bench) and just connected to the pwm header on it. You can also use a pwm fan controller if you have one, analog ones are easiest to use.   
     
    post edited by ragevirusqq - 2016/05/31 12:07:12

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