Pump control

[Tom Jenkins]

Here is a little help from previous threads.

http://www.plctalk.net/qanda/showthread.php?s=&threadid=2734&highlight=lag

http://www.plctalk.net/qanda/showthread.php?s=&threadid=2403&highlight=lag

And from another forum:

http://forum1.automationdirect.com/board/Forum1/HTML/000644.html

 

[harryg]

Greg,

I have an example of a triplex system but it's written in Klockner Moeller Easy Soft, I can't seem to change the file extension. Maybe check KM's website for a download of the Easy Soft if you can get it I would be happy to e-mail it to you.
We use a single pressure transducer on a common header using the lead/lag scenario, we stage the lead on pressure fall then stage the lag pumps two ways, if the lead VFD hits 59hz the lag comes in or if pressure setpoint is not met in a given time the lag stages.