Well spoke to a bloke at a place that advertises as a yaskawa motor and drive supplier, reconed
the drive and motor were developed for matsuura and they had mended original drives as they couldn't get
them working with new drives!
Had an email today from yaskawa, I had outlined the problem and asked about solutions, bloke suggested
either installing the original drive, or fitting a generic 3phase motor and vfd.
So looks like I am going to be fitting another motor.