Product Description:

The S7720C-PBF2-S4 is an AC servo drive produced by Kollmorgen as part of the S700 Servo Drives series. It functions as the power and control interface between a synchronous servo motor and the plant controller, regulating torque, speed, and position in automated machinery. The drive accepts three-phase mains and provides regulated output based on current feedback, making it suitable for high-power axes where fast response and integrated safety are required. In closed-loop operation, this arrangement helps the axis follow commanded motion profiles during acceleration, steady running, and deceleration.

Electrically, the unit can deliver a continuous phase current of 72 Arms, so motor selections with low-impedance windings can be driven without saturation. The permissible mains span of 208–480 V allows the same drive to be used on both low- and medium-voltage systems. Inside the IGBT bridge, the controller uses a carrier clocked at 8 kHz, which balances motor ripple torque with semiconductor switching losses. Functional safety is addressed by dual-channel STO, which removes torque-producing energy within milliseconds when either channel is de-energized. This safety function supports machine designs that require rapid torque shutdown without relying only on software commands.

Two integrated two 9-pin Sub-D connectors provide PROFIBUS-DP networking for cyclic setpoints and diagnostics. On the supply side, the converter is sized for a continuous apparent power of 50 kVA, and its semiconductor stack releases up to 1005 W of heat during 400 V operation. This heat output affects enclosure airflow or the use of optional cold-plate cooling. During fast edge transitions, the DC link exhibits a voltage rise speed of 4.8 kV/µs, so shielded motor cables and correct grounding are required. Mechanical installation is eased by a mass of 13 kg and a compact footprint of 190 mm in width by 244 mm in depth.