Well I am rather happy to say that today we managed to sort this piece o crap out.
So we original went to this thing with the POV that it hadnt run in a while due to some fault nobody had fixed.
As it turns out there is no way in hell this thing had ever run properly in the condition it was in, Which is very probably when it was modified to be inverter driven.
The final list of faults (and I use that term loosely) is rather long, So we came away with the POV the guy who mod'd it was a flaming idiot who had no idea what he was doing!
Highlights of the problems include:
Burnt out Dis Board
Burnt out breaker
Incorrectly programmed or U/S inverter (not really sure whats up with it)
Incorrect wiring between the Inverter and the Motor
Incorrect wiring of the Motor windings
So thanks again for your time DW, Was extremely helpfull and as usual I learned much from this episode.
Tony, Thanks for the reply, There was no chance of it windmilling but I do know what you mean, Used to have that problem with the air con units at my old site.