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Old 05-14-2022, 06:49 AM   #1
NXR
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How to recalibrate a Progressive Industries EMS voltmeter

I have a 3 year-old Progressive Industries hard-wired EMS in my Georgetown. On the last trip I noticed that the voltmeter seemed to be showing voltages on the low side, nothing concerning but at each of the few places we stayed.

After we got home I plugged in and noticed voltages of 115 volts and 113 volts, which is really low for our home. I checked the incoming voltage and it actually was 124 volts on L1 and L2 so the problem was the PI voltmeter was reading way low. That's a potential problem because it may mean that the EMS will disconnect the RV electrical power because it believes the pedestal voltage is too low when it's not.

Progressive Industries publishes a PDF on how to calibrate the voltmeter, which I received from another Georgetown owner who had the same problem. I adjusted the voltmeters to read correctly and I also applied a dab of silicone to the trimpot adjustment screws to keep them from turning under vibration. The adjustment took about 1 1/2 turns of each trimpot to move the voltage reading about 10 volts.

Perhaps this may help someone.

Ray
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File Type: pdf PI EMS-HW50C Voltmeter Recalibration.pdf (354.0 KB, 23 views)
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Old 05-20-2022, 10:50 PM   #2
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I think I wud wanna do it with no load and see if it made a difference? If it does, probably loose/ broken wires in the shoreline PLUG area?
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Old 05-20-2022, 11:47 PM   #3
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Thank you. Good information!
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Old 05-21-2022, 05:40 PM   #4
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Quote:
Originally Posted by THenne1713
I think I wud wanna do it with no load and see if it made a difference? If it does, probably loose/ broken wires in the shoreline PLUG area?

Actually, as it turned out, I awoke about five days later to hearing the motorhome generator running. The PI EMS said it was an overvoltage trip and the voltmeter was reading 133 and 134 VAC when the real input voltage was 122 VAC.

I shot note to PI and they shipped me a new logic board which I'll get installed soon. A friend who bought the same unit in 2019 as I did told me he had the same problem, the voltmeter readings drifting a lot over several days, and he also got a new logic board under their lifetime warranty.

We'll see...

Ray
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