Why does the EM540 disconnects form the cerbo GX?

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mystar asked May 2, '24

Why does the EM540 disconnects form the cerbo GX?

Hey guys,

I have an EM540 set as a grid meter. It worked fine for some weeks but 4 days ago it stopped working propperly. I can see the EM540 in the remote console in the section smart meter, but not in the overview. When I reboot the cerbo GX, it works for some minutes. The smart meter is then visible and the battery works fine. But after some minutes it disappears again. I can repeat this process as often as I want.

Has someone a clue why this is happaning?

Update: Now the EM540 doesn't connect to the cerbo after every reboot. But it is visible in the system all the time:-/

cerbo gx battery em540

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Answer 1 · 2024-05-02T17:13:09Z

duivert answered · May 02 at 05:13 PM

Looks like a bad connection and or faulty usb rs485 interface, how is it connected to the cerbo?

your not using a usb hub? That is a possible fault too

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Answer 2 · 2024-05-03T00:34:00Z

daniel-feist answered · May 03 at 12:34 AM

Mine works great. Is your usb-rs485 cable an original or have clone FTDI chip?

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Answer 3 · 2024-05-03T07:56:57Z

ejrossouw answered · May 03 at 07:56 AM

Have tried a different USB port? (Some of the first Cerbo's had a problem with the first USB port, which later became a power only port and with the latest generations been reinstated as a full USB port)

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Answer 4 · 2024-05-03T08:24:06Z

mystar answered · May 03 at 08:24 AM

Thanks for the ideas.

I also assume it's a bad connection issue. The connection is like this: EM540 <> CAT7 cable (together with AC cables) <> RS485 Adapter <> Cerbo full supported port.

After rebooting the cerbo serveral times yesterday, the EM540 didn't connect at all. Then I left it. After several hours I saw that it is working stable again. Until today. Nothing was changed... So i'ts weird but I hope it will stay like this.

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