Multiplus II Internal Diagram

In search of the internal diagram of the Multiplus II 48 5000/70 have noticed various images showing different internal connect/disconnect options.

The drawing inside the unit only shows AC1 out disconnect and Ground to neutral lift consistent with the wording of the instruction.

However, on the same model manual, I found a diagram showing ACout 2 disconnecting L and Pe

and in another diagram forwarded to me by a member yet another arrangement with AC1 out Pe ground lift.

What I need is to know if all Pes are bonded to the chassis at all times or if there are situations where one or more gets disconnected from the others.

BTW, if someone is kind enough to explain why Victrons call Pe that way I would be interested.

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conkev23 commented · Jul 25, 2023 at 08:03 PM

All of the grounds/PE/Physical Earth connections according to the schematic are connected at all times.

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conkev23 conkev23 commented · Jul 25, 2023 at 08:05 PM

hit submit too fast.

The relay that connects the PE to the N is for Nuetral bonding at the source when the unit is in off grid mode.

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logic28 conkev23 commented · Jul 25, 2023 at 08:21 PM

Yes that is very clear to me but here some are showing the Pe also being disconnected

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logic28 conkev23 commented · Jul 25, 2023 at 08:17 PM

Thanks, that is what I understand too, however, as you can see from the images, some drawings show that it gets disconnected on the way out

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Kevin Windrem logic28 commented · Jul 25, 2023 at 08:24 PM

If you look more closely, all PE connections are connected to a ground symbol. The relay to the left of the ground goes to neutral. This connection is open when on grid and closed when inverting with grid disconnected.

The Multi II does in fact have two AC input relays in series in order to meet some safety requirements.

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logic28 Kevin Windrem commented · Jul 25, 2023 at 08:31 PM

Yes, I've got confused by the different arrangments in different drawings, you're absolutely correct, thanks for pointing that out to me.

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conkev23 logic28 commented · Jul 25, 2023 at 08:28 PM

Are you talking about the relay that I circled?

If so, that is only for N to PE bonding.

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logic28 conkev23 commented · Jul 25, 2023 at 08:36 PM

Yes, but I can see now that it only disconnects the neutral so it is in fact consistent with my first image directly printed inside the case. My bad, sorry.

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