Quattro contactors clicking every 4 minutes?

System is triple 5kva quattros in 3 phase. VE LiFePo4 24V battery bank with BMS. With no AC input and no AC loads and front switches in inverter mode, about every 4 minutes the contactors all click, it sounds like a very quick on and off. There is no change in the indicator lights, the batteries are at 100% (solar chargers are on keeping the batteries up). Can anyone tell me why this is happening? Thanks

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Alistair Warburton commented · Aug 15, 2023 at 07:38 PM

Only AC is switched, 2 inputs and 2 outputs I think, on a Quatro, so the click/clunk has to be either input or output switching.

I know yiu said no AC input but check the AC in Voltages anyway, yiu could be seeing noise or voltage due to a leaky snubber network, (Which I am assuming is there but do not actually know is there)

If it is the output that is switching then check if you have an assistant doing that as the second output, by default, is only switched on ehen an AC input is on.

It all sounds a bit odd and will be interesting to find out what is going on.

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