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Error 5: Overvoltage on AC-out


I have a system where i just yesterday had the wirings done. The AC cables are 10 sqmm cables for AC-IN and AC-OUT. The system is a 3 phase 12 Quattro 48/15000/100 system with 5 Fronius Eco 27.0-3-S inverters.

My main question is that the error came up for only 30 seconds. If there was actual disconnection of the wire from the slave units, the error would have persisted. But it just went away and did not come up again.

Can anyone deduce why this situation must have happened?

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