EMS 50 High Voltage Cutoff ???

[boyscout]

Just got off the phone with PI and they said that the unit could be in need of calibration. They have had some issues with the circuit board company and they were not calibrated. He said check the incoming voltage and if it doesn't match the display you need to calibrate the board.

So, by inference, the EMS unit as usually sold SHOULD be able to handle and pass the higher voltages you found?

Why wouldn't I prefer your maladjusted unit, which cut out when high voltages appeared, because it would be easier on expensive equipment in the trailer?

[howson]

So, by inference, the EMS unit as usually sold SHOULD be able to handle and pass the higher voltages you found?

Why wouldn't I prefer your maladjusted unit, which cut out when high voltages appeared, because it would be easier on expensive equipment in the trailer?

I interpreted PI's response as meaning the EMS is mistakenly thinking the voltage is too high. In other words, when there is actually 120V the EMS is reading 125V (or whatever). Thus the alerts were false--the voltage may not have been too high.

[RVLife68]

Well a simple test of the voltage at the box will give the answer. I find it strange that this code is only happening at what I would call quite hours. To me it sounds like it’s calibrated correctly

[boyscout]

I interpreted PI's response as meaning the EMS is mistakenly thinking the voltage is too high. In other words, when there is actually 120V the EMS is reading 125V (or whatever). Thus the alerts were false--the voltage may not have been too high.

I read @Coheeba's original message as saying that he had measured voltage of 133-134 volts on leg 2 of his supply.

Maybe I'm wrong about that; maybe he just read the high voltage report from the EMS display.

[howson]

I find it strange that this code is only happening at what I would call quite hours.

I seem to be the contrarian today--not intentional!

A high voltage during quiet hours is what I'd expect. The load on the grid goes down (people aren't using electricity) so the voltage goes up. That's why when everyone and their brother is running their air conditioners there are "brown outs" (low voltage).

[Chiefblueman]

I seem to be the contrarian today--not intentional!

A high voltage during quiet hours is what I'd expect. The load on the grid goes down (people aren't using electricity) so the voltage goes up. That's why when everyone and their brother is running their air conditioners there are "brown outs" (low voltage).

I are a electrician and I approve Howard's message.
I keep a simple voltage monitor plugged in to the outlet at my hutch. Voltage rises in the middle of the night. Very often I'll see 114 on a hot day and 121 at 2 or 3 AM.

[RVLife68]

I seem to be the contrarian today--not intentional!

A high voltage during quiet hours is what I'd expect. The load on the grid goes down (people aren't using electricity) so the voltage goes up. That's why when everyone and their brother is running their air conditioners there are "brown outs" (low voltage).

This is my point. If the voltage from the pole is normal then quite time would read ~120. I’d expect that his EMS would read a low voltage code during peak hours. This is not the case. He’s getting high voltage readings. If calibration isn’t the issue then he’ll likely get readings in the 110s.

[bigjaike]

I are a electrician and I approve Howard's message.
I keep a simple voltage monitor plugged in to the outlet at my hutch. Voltage rises in the middle of the night. Very often I'll see 114 on a hot day and 121 at 2 or 3 AM.

Chief,

Do you know which leg the outlet you plug your volt monitor in?

[Chiefblueman]

Chief,

Do you know which leg the outlet you plug your volt monitor in?

Not offhand. I do however have another plugged in in the bathroom which is on the other leg so I have them both covered. Handy for keeping an eye on occasionally, especially when running the A/Cs.

[Coheeba]

Too many questions...
The voltage in original post was read off the EMS monitor not a meter.

The tech told me to check the incoming voltage to see if it matches the monitor. If not the board needs to be calibrated, I suspect that it is accurate but I will check. I can’t do it for a few days as I keep it at a storage lot and have to bring it home to get power.

As I said earlier, especially in rural areas, the power companies will push higher voltages to compensate for high demand which lowers the voltage. That’s why I would see higher voltages at night when there is low demand.