shelly fault disconnects Powerline

This is just an info dump which might help someone else:

I was recently struggling with a new / intermittent / eventually complete powerline ethernet/LAN failure in the pump room of my property. Long story short, after a day of isolation testing, for some reason my Shelly Plus 2PM was somehow the cause of the powerline instability. I swapped the unit out for a new one and the pump room powerline ethernet is now stable.

Not sure exactly what happened, I use several TPLink TL-PA7017P AV1000 powerline adapters around the property which I think use all three electrical cables (live, neutral, ground*)... and the way my Shelly was installed (& failed) there must have been some kind of 'leak' between live and neutral that caused the TPLink to immediately disconnect from the rest of the network.

Anyway, I'll investigate the faulty Plus 2PM unit this weekend – but in case anyone is searching this forum for 'powerline' related issues, try swapping out an otherwise perfectly functioning Shelly for another known good unit. Worked for me.

Cheers, Dan

p.s: *we have three phase AC power which also complicates powerline endpoint placement and fault tracing

Zitat von thgoebel

Thanks for telling us, Dan! There must be some electromagnetic interference between the primary step-down converter and the powerLAN frequencies, which is fairly enough suppressed in a good Shelly. But there must be devices which do not fulfill the specs in total…

You’ll get an insight in the ‘guts’ of Shelly plus 2PM right here:

Thema

Shelly plus 2PM: teardown, Stromaufnahme

Wie sieht es im Innern des Shelly plus 2PM aus? Wieviel Leistung verbraucht er? Das ist das Thema dieses Threads…

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Allterco ist es gelungen, den äußerst dichten Aufbau des Shelly 2 .5 noch kompakter zu gestalten. Die frei gewordene Leiterplatten-Fläche wurde dazu genutzt, die WLAN -Antenne als Leiterbahn auszuführen. So konnte die problematische Einklebe-Antenne des Shelly 2 .5…

thgoebel

11. Oktober 2022 um 13:39

Thanks for the reply & info.

The original Shelly Plus 2PM I had installed was operating perfectly for over one year, but something happened in the last couple days to cause this failure.

As an aside, the Shelly was connected with devices on AC phase 1, my powerline was plugged into AC phase 2 (with a pump nearby running on AC phase 3). They all share common neutral / ground and only after isolating what I thought were the obvious leakage points (outdoor AC lighting ring, some old ACDC lighting transformers, maybe the pump was failing? etc. etc.) the root of powerline disconnection was sadly this Shelly.

I'm happy to send the Shelly back to the factory if you guys want to figure this out in more detail. It still operates as normal, only thanks to the powerline headache was I even made aware that a problem had appeared.

Cheers again,

Dan