Not your standard 3 phase voltages by any means but might be okay for a converter ? I believe there is a minimum load required for one thing but I'm not 100% on that.

I meant to ask this much earlier, was the machine working okay with the current setup, you changed nothing and then the next time you started the machine there was this fault ?

Did you actually start any of the motors during these last tests ? it should be okay to do so but you won't get any braking.