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General Liquid/Water Cooling Discussion For discussion about Full Cooling System kits, or general cooling topics. Keep specific cooling items like pumps, radiators, etc... in their specific forums.

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Unread 04-12-2003, 01:19 AM   #1
psychofunk
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Default I'm playin devils advocate

Okay theres another thread in the forums that asks about running your pump 24/7, well in a post by BB2K he links to this article ( http://www.procooling.com/articles/h..._pumps_-_p.php ) in which the author writes that using a relay is bad and will shorten the life of your pump.

What I want to know is what is your experience with this? How much does it shorten the life of your pump? Will I need to replace my Danner Mag3 every couple of months? Will I lose 3 weeks off of it's total life? Whats the deal? I turn my computer off and on once a day so the comments in this article has made me wonder. Any other comments on turning the pump on and off would also be appreciated.
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Unread 04-12-2003, 01:44 AM   #2
Tuff
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I might expect this kind of reasoning from a DC motor though...but here it goes.


The reasoning behind what he speaks of is that when you turn on the pump(Motor) reguardless if its a relay or not.. you send power through the fields to a non moving commutator...its like a split second dead short..until it starts to turn.


"Not to worry", unless you are trying to pump a fluid that would initially cause the motor to bog down or overload or basically cause drag of some kind. ie...pumping sludge.





Tuff

Last edited by Tuff; 04-12-2003 at 01:56 AM.
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Unread 04-12-2003, 09:51 AM   #3
#Rotor
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But also remember..... it's not the dead short, that will damage the motor! It's the heat normally associated with a dead short, that will burn the windings, resulting in the degradation of the very thin insulating film on the copper wire. That is what causes an electric motor to die.
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Unread 04-12-2003, 10:52 AM   #4
Volenti
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I've used a pretty wide variety of centrifical pumps over the years and I've yet to see one fail pre-maturely from powercycling (infact I've only had one pump fail from motor failure, and that one was on 24/7)

I have test pumps that get power cycled very frequently at times, none have let me down.

I've never had a pump fail from motor failure in my pc water cooling, and they get power cycled every day, including my iwaki pump, I'ts not something I worry about.
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