EM540 grid meter shows polarity inversed values in VRM dashboard

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jos84 asked Sep 1, '23

EM540 grid meter shows polarity inversed values in VRM dashboard

I have a 3-fase home connection and one multiplus2 + pylontech battery on fase L1

I have split off some groups in my home setup and connected them to the critical loads output of the multiplus.

Everything else is connected to AC input (including a few solar panels) so I am not using AC output

I have an EM540 meter after the main switch to measure my total production/consumption and it is defined as external grid meter in the Cerbo settings

I have installed ESS assistant and run a small node-red flow to control the grid setpoint manually

In this example picture the battery is idle. The ants move in the direction of the critical loads and the direction of the grid.

Somehow the grid shows the values in inversed mode?

I checked the manual of the em540 but see no option to invert the polarities.

What could be the cause of this?

dashboard display

1693597183659.png (123.3 KiB)

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Modifications Space

Node Red Space

Answer 1 · 2023-09-02T03:09:49Z

gerhardlang answered · Sep 02, 2023 at 03:09 AM

The input from the grid meter goes into the upper connectors of the EM540?

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Answer 2 · 2023-09-02T12:34:50Z

jos84 answered · Sep 02, 2023 at 12:34 PM

must have had a total blackout, thx

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Answer 3 · 2023-09-22T22:17:50Z

daniel-feist answered · Sep 22, 2023 at 10:17 PM

@jos84 Did you fix this by rewiring, or by changing the polarity in the software?

I have the same issue, and in theory, this can be changed via the "Universal Configuration Software", but the changes don't seem to have an impact.

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Answer 4 · 2023-09-23T04:23:29Z

jos84 answered · Sep 23, 2023 at 04:23 AM

I changed the wiring

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daniel-feist commented · Sep 23, 2023 at 08:46 AM

OK. I managed to connect the software and it recommends a change to support bottom input (so it seems this is supported) but then it doesn't update the meter. Think I need to call CG on Monday.

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daniel-feist daniel-feist commented · Sep 27, 2023 at 04:46 PM

CG sent me a newer version of the UCM software which wasn't available online and with this I was able to adjust polarity in software.

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Timo Engelmann daniel-feist commented · Feb 17 at 01:32 PM

Hi Daniel,

can you give me an information about the version?
Or better can you send me the UCS-Tool?
I have the problem, that the wires coming from the official grid meter are to short for connecting on the upper side of the EM540. So I have to invert the Input/Output in the Software.

Thanks Timo

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daniel-feist Timo Engelmann commented · Feb 17 at 03:11 PM

"UCS 7.34.3" is the version that works. Should be available online somewhere I assume, or ask CG. If you have any issue let me know and I'll dig around and see if I can find it.

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