AS350 Genertor
as350nut regarding starting:
Without going into the K1-K4 relay Z1 PCB card sequencing in the master electrical box, the generator will automatically engage once the generator voltage exceeds the distribution bus voltage by 0.5v. This will occur once the generator switch is engaged and there is no external power (i.e. aircraft battery start). With the start button depressed beyond 40-45% NG you will inhibit the generator from coming online. This is actually a required maintenance check for start inhibition (maintenance inspections related not normal procedures) and a successful check is noted by illumination of the CAP Generator light. It also prevents a few other items from occurring too like igniters. The Generator function itself is therefore a matter of voltage difference rather than NG percentage although they correlate.
Hope that helps.