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Old 07-02-2009, 04:21 PM   #1
hukdizzle
 
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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?

 
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Old 07-02-2009, 04:25 PM   #2
jkarp
 
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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.

 
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Old 07-02-2009, 04:43 PM   #3
Bobby_M
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Right. Ball valve on the output. It's a magnetic drive so you can completely stop the flow for a while without damage.
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Old 07-02-2009, 04:43 PM   #4
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right on, that's what I needed to know. thanks guys

 
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Old 07-03-2009, 05:05 AM   #5
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+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.

 
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Old 07-03-2009, 05:38 AM   #6
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Quote:
Originally Posted by Derrin View Post
+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.

 
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