Product Description:

The S74802-FBF2-NA is a digital servo drive produced by Kollmorgen within the S700 Servo Drives series. It conditions AC mains power and delivers regulated current to matched servomotors while monitoring encoder feedback, allowing precise position, velocity, and torque control in industrial automation cells. The unit is intended for machinery that requires fast response, integrated safety, and high power density in 208 to 480 V installations.

Its continuous output capability is 48 Arms, while short bursts up to 96 Arms accommodate acceleration peaks without saturating the drive transistors. Supplied from three-phase mains between 208 to 480 V, the input section can draw as much as 35 kVA at full load. The IGBT bridge is pulse-width modulated at 8 kHz, a switching frequency chosen to limit audible noise and reduce motor torque ripple. A current form factor of 1.01 indicates that the effective RMS current is nearly identical to the DC equivalent, which helps protect motor insulation. The secondary encoder supply furnishes 5 VDC at 300 mA, and the residual voltage drop across the power stage is 6 V. The drive may be switched on or off up to 30 cycles per hour without exceeding thermal limits, and it uses standard PCBs for the baseline configuration.

Physical installation is supported by a width of 190 mm, a height of 386 mm, a depth of 244 mm, and a mass of 13 kg. A fan-controller expansion card starts airflow when the internal heat sink reaches 65 °C, and acoustic output is capped at 62 dB(A). With the fan disabled, the drive sheds only 24 W of heat, which supports control cabinets with limited passive ventilation. The safety circuit includes dual-channel Safe Torque Off with a channel-one reaction time of 1 ms, enabling rapid motor shutdown during emergency events.