Product Description:

The S7720C-SEF2-F2 is a servo drive produced by Kollmorgen within the S700 Servo Drives series. It provides closed-loop current and velocity control for synchronous or induction motors used in industrial packaging, printing, and robotics equipment. By combining power conversion, braking circuitry, and fieldbus communication in one housing, the drive simplifies cabinet layouts and supports precise motion profiles. Its control functions are suited to coordinated axes that require stable torque response and accurate speed regulation during starts, stops, and synchronized motion.

Electrical performance centers on a wide input range of 208–480 V three-phase, and the power stage delivers a rated phase current of 72 Arms. Transient demands are handled by a peak output of 140 Arms that may be sustained for 5 s. The output stage is pulse-width modulated at 8 kHz, and motors with inductance down to 0.61 mH can be connected without stability issues. Internal losses add only a 6 V residual drop, while the converter can draw 50 kVA from the mains. Braking energy is dissipated continuously at 8 kW through the integrated chopper and a 10 Ω external resistor, and short pulses up to 70 kW are also tolerated. This braking arrangement is useful in applications where deceleration returns substantial energy to the DC bus.

In the control architecture, the Slot 1 interface is SERCOS II and supports a bus speed of 16 Mbaud, allowing synchronized communication with multi-axis controllers. For machine safety, a dual-channel STO circuit can be wired directly to emergency-stop chains so that motor torque is removed without opening the main contactor. Thermal management is automated, because the controlled fan option engages at 65 °C, and an optional expansion card serves as the fan controller. Applications that favor conduction cooling can use the Coldplate mechanical option instead of relying only on airflow. The drive may be energized for up to 30 switching cycles per hour without exceeding its duty limit.