Multiplus II shuts down for a few seconds VE.Bus error #1 and #3

[HolgerN]

I have a problem in one of my installations. It is a 3-phase system with 3 Multiplus II and Cerbo GX. There is ESS running. The batteries are 3 Pylontech US3000, connected via a Lynx Distributor.

After running 1 1/2 years without problems, it now happened several times that the 220V output shut down for only a few seconds. The customer can not tell, if it was just one phase or all 3, because it was so short. In have different errors in the VRM alarm-protocol and on the GX. The GX device shows most times VE.Bus error#1 and just one time VE.Bus error#3. On the VRM alarm-protocol only the error#3 appears, but always 3 times with just 1 or 2 seconds time difference. The error#1 on the GX device is about one hour later.

I have no idea how I can localise the problem. It is very rare, the first time in August 24 and now 3 times in December. And the shut down is extremly short. I checked the DC fuses, but they are OK and I also checked the communcation connections. Thats all short original Victron cables.

[Ludo]

What modifications and updates were made at the time the problems started?

[HolgerN]

There has been no modification or updates at all since the first installation.

[Ludo]

What are the text descriptions of these errors ?

[HolgerN]

This is the VRM listing:

276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-12-12 13:26:16	6m, 56s
276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-12-12 13:26:16	1m
276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-12-12 13:26:27	38s
276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-12-03 12:33:40	14m, 6s
276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-12-03 12:33:40	1m, 7s
276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-12-03 12:33:56	35s
276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-08-28 13:21:31	1m, 1s
276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-08-28 13:21:31	29s
276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-08-28 13:08:59	3m, 58s
276	VE.Bus System [276]	VE.Bus Error: VE.Bus Error 3: Not all, or more than, the expected devices were found in the system	2024-08-28 13:08:58	1m, 1s

The GX device says: #1 Gerät ausgeschaltet (device switched off)

[Ludo]

Clean and check all contacts of the ve.bus.

You’d have to ask victron if its possible to make a trace with wireshark and a mk3, but I’m afraid not

[HolgerN]

I made some more investigations and found out, that all 3 phases shut down at the same time. At that time also the VE.Bus went to off and the DC current was quite high. I am not sure what causes what and why. Today it happened 3 times and yesterday one time. Does anybody has an idea?

This is what it looks like: