Product Description:

The S77202-SEF2-S3 servo drive is produced by Kollmorgen as part of the S700 Servo Drives series. It converts three-phase mains into regulated output for synchronous or induction motors. This allows precise speed, torque, and position control in automated packaging lines, material-handling axes, and general machinery.

At its nominal operating point, the drive delivers a rated phase current of 72 A RMS. For short acceleration bursts, it can supply up to 140 A RMS for 5 s before software limits reassert, letting connected axes overcome high inertial loads. The front end is sized for 50 kVA of input power drawn from three-phase mains between 208 to 480 V, so the same unit can be used on low- or medium-voltage plants without rewiring the bus. Internal IGBTs switch at 8 kHz, balancing current ripple against thermal dissipation. Motion commands enter through a SERCOS II fiber-optic link installed in slot 1, while slot 2 uses a controlled fan path to evacuate heat. An external 10 Ω brake resistor can be attached when regeneration levels exceed the integral dissipation path, and two independent STO channels interrupt gate drives for emergency stop compliance. The option set uses standard PCBs, and a dedicated fan-controller expansion card supervises cabinet airflow.

The analog front end is scanned every 62.5 µs and has an input impedance of 150 kΩ, preventing loading of upstream PLC outputs. Brake energy that cannot be returned to the mains is absorbed continuously at up to 8 kW, keeping the DC link voltage within safe limits during frequent deceleration cycles. The housing is 386 mm high, 190 mm wide, and 244 mm deep, and it weighs 13 kg, fitting a standard 300 mm control-cabinet column without extra bracing. The remaining back-plane space can be used for daisy-chained S700 units, and the drive’s PCB layout is sized for efficient heat transfer toward the rear plate.