We have a problem with a 3 Phase VE.Bus system, containing 3 Multiplus II 48/5000 with HQ2250. The system throws VE.Bus Error 3: Not all, or more than, the expected devices were found in the system randomly. Each UTP cable is changed and moved away from power lines. Did not solve. Cerbo have been changed for testing, did not solve, shielded UTP has been installed, did not solve the issue. It seems like one or more of the inverters is bad, could be a bad comm board, but there is no visible issue in any of the units. Had any of you had a similar issue?
Currently the only possible solution that we can think of, is to change all 3 of the MPII units and send them for RMA, so they hopefully can find the issue. Currently I’m not aware of any way to find which unit or units are causing the issue.