Pole voltage VS EMS Voltage
Well if it's July, I must be discussing power issues at the campground . . . Lately, we've been experiencing voltage issues which the Progressive EMS has been seeing and shutting down power until ...
Forum Discussion
neschultz wrote:
My hard wired 30 A EMS had the same symptoms from day 1. It always displayed 4 volts higher than the actual voltage. They told me how to adjust the unit to read the same as the input voltage. Maybe yours just needs this adjustment or maybe its bad. Can't help with the hum.
Hum is merely the contactor (relay) ... carefully cleaning the contacts may reduce hum somewhat but it's nothing to be concerned about. I've located mine under the sofa and recently I've noticed it a little noisier than in the past so one of these days I'll clean those contacts with an eraser to see if that helps.
I calibrated my own EMS-HW30C - blue trim pot as shown on the lower left in this pic.
I've not opened a 50 amp version but there would either be a similar dual trim pot or perhaps two separate pots, one for each leg. However, I wouldn't fool with this unless using a calibrated meter, otherwise you'd just be guessing. ;)
