Bulletin 1398 F-Seriesâ„¢ Servo Motors are ideal for applications that require moving large loads smoothly. These medium-inertia motors provide a compact design and high inertia-matching capabilities. F-4030 motors use an optical 2000-line incremental encoder with a 5000-line option for superior low-speed performance with our Ultraâ„¢ Series servo drives. With the optional motor shaft seal installed, the motor meets IP65 requirements of the IEC standard.