YASKAWA S Series User Manual page 122

6.5 Power ON Sequence (Communication Sequence)
6. M a i n circuits ON (SV_ON command).
When the main circuit has been turned ON, confirm the following status: SVON=1.
7. Operation starts.
8. Main circuit OFF (SV_OFF command) and turn OFF the main power supply.
9. Communication disconnected (DISCONNECT command)
10. Turn control power supply OFF.