RCD tripping when connecting to grid after firmware update

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mr-manuel asked Mar 28, '24

RCD tripping when connecting to grid after firmware update

Hello,

after I updated the firmware of my MultiPlus II 48/5000/70-50 from 497 to 508 every time I try to connect the grid the RCD trips. If I put the MultiPlus in "Charge only" then it works without problems.

I live in Italy and have this constellation:

Grid -> RCD 30mA (which trips) -> MutliPlus II -> RCD 30mA -> Mains.

When I bypass the MultiPlus II by cabeling all works also fine. Before the firmware upgrade everything also worked fine. I checked everything on cabeling, but it makes no sense to me, since nothing changed and it is working when I put the MultiPlus in "Charge only".

To me it seems, that the grid relay is not disconnecting before connecting the grid, but I don't know why.

Is there a way to downgrade the firmware to 497 again? Unfortunately I was not able to find the firmware on professionals.victronenergy.com, a direct link would be great in case I missed it.

rcd tripping grid relay

1711656877003.png (24.7 KiB)

1711656890092.png (45.1 KiB)

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nickdb answered · Mar 29 at 08:36 PM

I think you need to return it for bench testing. If you have followed the advice here for error 11 and the firmware is current, which it seems to be:

https://www.victronenergy.com/live/ve.bus:ve.bus_error_codes#:~:text=Error%2011%20indicates%20a%20failed,failure%20(eg%20inoperable%20relays).

Then, most likely, one of the dual input relays has failed.

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Modifications Space

Node Red Space

Answer 1 · 2024-03-28T21:24:20Z

Alex Pescaru answered · Mar 28 at 09:24 PM

https://updates.victronenergy.com/feeds/VEBus/firmware-archive/

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Answer 2 · 2024-03-29T18:31:19Z

mr-manuel answered · Mar 29 at 06:31 PM

Ok, now I downgraded the firmware, but the error persists.

I now replaced the RCD with a normal braker and now I get this error:

1711737092862.png (28.9 KiB)

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mr-manuel commented · May 30 at 04:42 PM

After the change of the relays all is working normal again.

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Answer 3 · 2024-05-26T22:52:02Z

dansonamission answered · May 26 at 10:52 PM

We just updated the same unit from 498 to 510 and rcd now keeps tripping. This is a new unit. Doesn't matter which mode its in, inverter or charger.

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mr-manuel commented · May 27 at 05:27 AM

If you know, what you are doing then connect the MultiPlus directly to the power source without RCD (but with a normal braker to protect the cables!) for the time of testing only and see, if then you get an error message in the GUI/remote console.

If you are no electrician then bring the device to a Victron partner nearby and let them check it for you.

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Answer 4 · 2024-05-30T14:41:51Z

giampaolo answered · May 30 at 02:41 PM

Hi mr. Manuel I have seen that you are in Italy (the VE Bus screen shows Italy CEI 0 21). Since I am in Italy too, my I ask you wath kind of external IP interface protection are you using . Regarding your problem with the RCD I have seen in many installations that is used a 300mA device on the inverter line.

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mr-manuel commented · May 30 at 04:40 PM

Yes, I have also a 300mA one between the grid connection and the AC-In of the MultiPlus. But in my case the problem was a faulty ground relay.

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Answer 5 · 2024-05-30T20:08:12Z

daza answered · May 30 at 08:08 PM

I’d say use a 100ma time delay rcd on it which would allow your RCBO’s to trip before the multiplus, I’ve got one on mine being a TT system not had it blip at all. Hope that helps

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