The filter you need is a single phase one, at the input to the VFD as shown in 2.2.5 of the manual (although that shows a 3-phase filter but the idea is the same). Ideally the output wire should be wrapped through a ferrite ring (of the right size for the cable) to kill high frequency harmonics. It will work quite happily wthout either but you may get noise back into the ring main (not that you are going to run this off the ring main with an input current of 16A, needs a direct connect back to the board on a 20A MCB)

That PDF is issue 2, maybe yours is a different issue - use the later of the two.