Product Description:

The S7720C-PBF2-S3 is a Kollmorgen servo drive positioned within the S700 Servo Drives series. As an AC-powered regulator for torque, velocity, and position loops, the unit interfaces directly with brushless servo motors in automated machinery and packaging lines, delivering precise current control and integrated safety functions. It is intended for closed-loop motion control in industrial automation systems that require accurate axis response.

The drive accepts line supplies from 208 to 480 V and is rated for a continuous output of 72 Arms, while momentary overload current can reach 140 Arms. Within that operating range, it draws up to 50 kVA of input power, so the incoming branch circuit must be sized accordingly. The switching network operates at 8 kHz to reduce torque ripple during motor operation. A residual voltage drop of 6 V appears across the power stage during conduction, and the output can drive motors whose phase inductance is as low as 0.51 mH.

Thermal management relies on a controlled-fan assembly and a cold-plate mounting option, and together they remove 1005 W of loss heat during rated operation. Safety is handled by a SIL CL3 / PLe architecture that combines dual-channel Safe Torque Off and a diagnostic PFHD of 1.38 × 10⁻⁹ h⁻¹, supporting a mission time of 20 years. The STO hardware is implemented as dual channel STO, letting the drive support Category 4 stop requirements without external contactors. An onboard PROFIBUS DP interface, served by two 9-pin Sub-D ports, provides cyclic setpoint exchange, while an expansion fan controller card supervises blower speed. Peak voltage transition is limited to 4.0 kV/µs to support EMC performance, and the assembly’s output current ripple remains bounded by an output form factor of 1.01.