Progressive EMS-HW50C unit
We have Porgressive EMS-HW50C about 1.5 years old and hardwired at the dealership into our new camper. Yesterday about 1:00 a.m. we heard this loud tapping noise. We thought we had a large rat in ou...
Forum Discussion
Learjet wrote:
For reference the Hartland Contactor in the EMS needs 88 votls to close and will drop out 20-77 volts, according to their website.
So yes, even in by-pass you will still get the contactor to open with extreme low voltages.
http://www.hartland-controls.com/#!blank/c1pqo
just the info I was looking for, thanks. So that indicated what I expected, the little honda 2000, doesn't just drop below 104V, it must be dropping down below 70ish volts, which is consistent with sound guys data. However, It only drops down for a fraction of a second, as soon as the relay opens, it pops back up, and relay closes again, then repeat.
Line power will very very seldom exhibit that type of behaviour, the line power is "stiffer", much lower source impedance so if it is dropping down below 70V you are REALLY drawing lots of power, Even a 75A load or so on a 15A branch circuit (what a 1hp motor draws for a few cycles on startup under load) will only drop the voltage down to around 100V, maybe 90 worst case.
However, I suspect the EMS electronics is designed such that it doesn't catch the generator short cycle dropouts AND it can't do anything about the relay chatter with generators, that's a mechancal/electrical function of the relay itself.
