I need urgent help with the setting up my vfd inveter it is Sunfar E380 model, 7.5kw and air cooled. CNC spindle is 380v, 300Hz, 18000rpm and 7.2kw. presently i cant get inverter to power from PC except i power on directly from inverter and then when job is completed on machine spindle runs in the opposite direction instead of stopping. What have i done wrongly and what do i need to do to overcome challenge.