Hi Coulomb
Thank you for coming back to me.
The lift motor is 2.9KW
The Axperts are configured as phase 1,2,3 and in the matched breakers points in the breaker box.
All Neutrals are linked across the inverters so all bonded.
The inverters are locked to 230v and cant see anyway to change that.
The generator is matched to 230v as well.
We measured the voltages across the all phases with the inverters only and then the generator on and the phases all measure the same (say within a couple of volts)
The lift control is a massive great big unit but I dont have full details about it with me at the moment.
We tried neutral to earth bonding which made no difference.
I feel it must be a phase issue but im at a loss at the moment
Best Regards