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-   -   March pump speed adjustment (http://www.homebrewtalk.com/f11/march-pump-speed-adjustment-126486/)

hukdizzle 07-02-2009 04:21 PM

March pump speed adjustment
 
Was wondering what you guys have done to variably control the speed of the March pump since it has no potentiometer built onto it. Ideas?

jkarp 07-02-2009 04:25 PM

Why would you want to change the speed of the pump? If you're wanting to control FLOW, put a ball valve on the output. The pump can run perfectly fine even with the output completely shut off.

Bobby_M 07-02-2009 04:43 PM

Right. Ball valve on the output. It's a magnetic drive so you can completely stop the flow for a while without damage.

hukdizzle 07-02-2009 04:43 PM

right on, that's what I needed to know. thanks guys

Brewers Hardware 07-03-2009 05:05 AM

+1 on the ball valve.

I seem to remember reading that you can burn up an A/C electric motor by trying to slow it down with a rheostat. Had something to do with Ohms Law and dropping the voltage causing the current to increase and the motor to run considerably hotter until it finally burns up. Not a problem with a DC motor, but very bad for an A/C motor.

Laughing_Gnome_Invisible 07-03-2009 05:38 AM

Quote:

Originally Posted by Derrin (Post 1413339)
+1 on the ball valve.

I seem to remember reading that you can burn up an A/C electric motor by trying to slow it down with a rheostat. Had something to do with Ohms Law and dropping the voltage causing the current to increase and the motor to run considerably hotter until it finally burns up. Not a problem with a DC motor, but very bad for an A/C motor.

Unless it's a three phase and you have a Variable Frequency Drive.......But now we are just getting carried away with useless knowledge as the the question has already been answered. :fro:


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