Troubleshooting with installation. N connected to PE! VE-bus problem

DIY
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1

Hi,

I have installed a 3-phase system and connected the AC inputs as follows: brown to the first phase(Multiplus II 1), black to the second phase(Multiplus II 2), and grey to the third phase(Multiplus II 3), with ground and neutral (blue) connected for all. I applied the same approach to AC out 1, but the earth leakage circuit breaker (aardlekautomaat) keeps tripping. After some investigation, I discovered that the neutral output is internally connected to the earth connection within the MultiPlus. This seems unusual, as earth and ground are typically only connected at the energy provider. To resolve this, I disconnected the neutral connection to prevent it from shorting with the ground. What is wrong? I want to enable the emergency power.

The second issue involves the connection between the MultiPlus II units and the Cerbo GX. I have three MultiPlus II 48/5000 devices and a Cerbo GX. When I connect a network cable from the Cerbo GX to a single MultiPlus, it works as expected; the display shows the device’s current state. I tested multiple network cables, and they all worked correctly when connecting a single MultiPlus to the Cerbo GX. However, when I tried to connect all three MultiPlus devices to the VE-bus, problems arose.

I connected one network cable from the VE-bus of the Cerbo GX to the first MultiPlus, then used another cable to connect the first MultiPlus to the second. Although the connection seemed fine initially, both devices switched their internal relays, and an error (Error 3: unknown device found) was reported. This prevents me from connecting more than one MultiPlus device to the VE-bus. You have to reconfigure it? VRM portal? What is wrong?

Any advice or solutions would be greatly appreciated.

Kind regards,
Mark

2

This is normal behaviour if the inverter is inverting. Since when inverting it is the energy provider.
The ground neutral relay is mentioned and shown in a block diagram in the manual.
If you don’t want it to bond ever, there is an option to turn it off in programming unless your grid code enforces its use.

Have you programmed it as a three phase system?
First time set up requires the mk3 to usb dongle. You update firmware and program the system with it.
If this is your first system then you need to get trained and read manuals.