Article View: sci.electronics
Article #7256Re:Ac motor control question
From: hbg6
Date: Fri, 14 Sep 1990 13:58
Date: Fri, 14 Sep 1990 13:58
26 lines
1877 bytes
1877 bytes
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 ..................................................................... reply to 'from' address; hbg6@citek.mcdphx.mot.com NOT the 'sender' line address! Someday my sysadm will decide this is a 'real' problem. :-) ..................................................................... All opinions expressed are mine and not Motorolas, their loss. .....................................................................
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Path: arc1-ca.pugleaf.net!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. Lines: 26 References: <90256.174441ESV@psuvm.psu.edu>