Quote Originally Posted by Ben-bee View Post
So if i connect live to l1, neutral to neutral and earth to earth, on the original, inputs. would i need to disconnect the l2 and l3 ect. or leave as is.
And if instead of the 3 phase output to vacuum pump, if i connected a single phase pump, just to the l1 out on the lr2k0321, would this work.

lr2k0321 below the lc1ko9.
That should work fine.

However you'd have to check the current limits of the LR2K0321, as a single phase pump is likely to need more current, so may exceed the current limit. The worst case scenario is you need change the protection device, and if you go too big on the vacuum, you may even have to upgrade the other contactors.
What you may find is an easier option, is to add another inverter to run a vacuum pump, as 3 phase vacuum pumps will be more common/cheaper.