normal rotation; forward rotation
Technical term used in machinery and engineering contexts to describe rotation in the standard or forward direction, as opposed to reverse rotation (逆転).
Please check whether the motor is rotating in the normal direction.
このスイッチで正転と逆転を切り替えられます。
You can switch between forward and reverse rotation with this switch.
Compound of 正 (sei, 'correct' or 'normal') and 転 (ten, 'rotation' or 'turning').