Product Description:

The S7720C-DNF2-S3 is a Kollmorgen motion controller that belongs to the S700 Servo Drives series. This servo drive converts three-phase mains power into precisely regulated motor current so that automated machinery can position loads quickly and repeatably. By integrating drive electronics, safety logic, and fieldbus connectivity in one enclosure, it serves as a compact axis module for packaging lines, material-handling gantries, and other industrial automation cells.

The drive accepts a mains range of 208 to 480 V and is designed to process up to 50 kVA of input power. Under normal loading, it delivers 72 A rms of continuous output current, while transient demands can be met with peaks of 140 A rms. An output current form factor of 1.01 shows that RMS and average values are nearly equal, which helps limit additional conductor heating. Continuous brake power is 8 kW, and the residual voltage drop across the power path is only 6 V, which helps keep internal losses low. Thermal management is supported by a cold plate option for conduction cooling, and an expansion card supervises an auxiliary fan; the F2 fan on the heat sink starts at 80 °C. When decelerating high-inertia loads, an external 10 Ω resistor shunts regenerated energy. Noise emission does not exceed 68 dB(A), and the DeviceNet fieldbus port exchanges setpoints and diagnostics with the host PLC.

The safety interface includes seven configurable safety inputs, four configurable safety outputs, and the Slot 3 Safety 1-2 card for category-based shutdown schemes. The architecture attains Performance Level PLe and Safety Integrity Level SIL CL3, and a dual-channel STO circuit removes motor torque without cutting auxiliary power. An external brake resistor of 10 ohms links to the internal chopper to absorb rated brake power and protect the DC bus.