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you could also use a beefy relay with 120V coil. As the RPM's drop, so does the voltage and the coil will drop, cutting off the load and you don't have to reflash the rotor.This would work with some fiddling to get to coil to let go before the demag happens.
I would suggest a voltage monitoring relay over a frequency style, in that link there is plenty to chose from. Ive never actually messed with the frequency relay on a slow speed but it makes since how it wouldn't work well with it. I was going to set one up on my small yanmar homemade generator for a two speed throttle using a solenoid.
Take your pickhttp://www.crompton-instruments.com/downloads/2015/EPP-2040-1115_protectors_201115.pdf
Quote from: Jake65mm on July 23, 2016, 12:46:54 AMTake your pickhttp://www.crompton-instruments.com/downloads/2015/EPP-2040-1115_protectors_201115.pdfThanks for all of the instructables This is great stuff....Looking at the link to Crompton Instruments I did not find any plain voltage monitors but phase and voltage monitors. The one that I believe applies best to my 10HP, 7.35KW, SINGLE PHASE LISTEROID is PSF/G3-173/240 http://www.crompton-instruments.com/downloads/2015/EPP-2040-1115_protectors_201115.pdfDo you think this will work with my single phase generator?Thank you ....
I concur with the Energized to Run methodology. Some manufacturers used an energized shutdown control system, but those were complex and less reliable. Lister has used a simple Energized to Run safety fuel control solenoid for decades.dieselgman