Path: utzoo!attcan!uunet!cs.utexas.edu!asuvax!mcdphx!citek.mcdphx.mot.com!hbg6
From: hbg6@citek.mcdphx.mot.com
Newsgroups: sci.electronics
Subject: Re:Ac motor control question
Message-ID: <13605@mcdphx.phx.mcd.mot.com>
Date: 14 Sep 90 13:58:34 GMT
Sender: listen@mcdphx.phx.mcd.mot.com
Reply-To: hbg6@citek.mcdphx.mot.com
Organization: Motorola Microcomputer Division, Tempe, Az.
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References:<90256.174441ESV@psuvm.psu.edu>
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In article <90256.174441ESV@psuvm.psu.edu> ESV@psuvm.psu.edu (ANDREW COLL esv@psuvm.psu.edu) writes:
>.........  When water flows into
>the pipe, the float switch turns on and starts the pump.  The pump then
>sucks all of the water out of the drain line, causing the float
>switch to turn off again.  About a half a second later, enough water
>has flowed into the pipe again to turn the pump back on.  So now, the
>pump is oscillating between on and off, about fifteen times a minute.

Why not go buy a working switch? (or the right kind). A sump pump float
switch is supposed to have two limits; a high water mark and a low one.
When the water reaches the high limit, the pump turns on and pumps the
'water' out of the sump until the the lower limit is reached. The level
must then rise to the high limit before the pump is turned on again.

PS- Count your blessings; I learned about such things working on a SEWAGE
sump pump in our house near Chicago. Stinky, messy, foul, YECH!

John

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reply to 'from' address; hbg6@citek.mcdphx.mot.com
NOT the 'sender' line address!
Someday my sysadm will decide this is a 'real' problem. :-)
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All opinions expressed are mine and not Motorolas, their loss.
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