The current limit setting is dependant on your motor design and application. When I worked in a steel mill our engilsh electric 'mill motors' had a current limit of 2 per unit. Since the application required very quick screwdown movements and as they were not continous the overall motor...
Does this particular drive have a setting for the front limit firing angle? I have worked with some drives where the firing angle is determined from a separate sync supply where a saftey margin was required when setting this limit. The drive could be trying to fire before the phase crossover...