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
ktmrfs wrote:
that delay is for complete loss of input power, a voltage sag doesn't (at least on mine) trigger that delay. It causes the relay to drop out. When it does that it does NOT trigger an error message.
I've only experienced total power loss since installing my Progressive EMS-HW30C but earlier in the summer when I was still using my TRC 34370 Surge Guard we did suffer a continuing brownout condition over the course of several days during which source power did drop below the unit's 102 vac threshold, at which point the SG did shut off power completely even though that power had only sagged, not dropped out completely. The greater annoyance was that minutes later voltage would recover somewhat and the TRC would then restore power to the trailer after it's obligatory delay ... then voltage would sag again and it would turn off, then come back on again, then turn off again ... annoying as heck so I unplugged completely. I can't say yet whether my EMS would behave in the same way but I have no reason to expect it wouldn't ... anything below it's low voltage threshold of 104 vac and I'd expect it also to disconnect power to the trailer.
And bypassing with the switch will NOT solve this problem. the low voltage trip will stay enabled. the switch just disables the reversed polarity, open ground, open neutral, etc.
From the EMS-HW30C / 50C owner's manual -
"Bypass switch: This switch is located on the remote panel, and allows the user to bypass the computer circuit in the EMS in the event of computer failure, thus allowing source power into the RV. This does not disable the surge protection portion of the EMS."
Seems to me bypass does disable all EMS functions except surge protection.
