Product Description:

The S77201-NA belongs to the S700 Servo Drives series from Kollmorgen. As a digital servo drive, it supplies regulated three-phase power to matched synchronous motors, closes high-speed current and velocity loops, and exchanges motion commands with the machine controller through fieldbus links. Within an automation cell, it acts as the power conversion and safety node, translating low-level control signals into the precisely timed phase currents required for dynamic positioning and speed regulation.

This model accepts a line input between 208 to 480 V, allowing installation on common industrial mains without an autotransformer. At a continuous load, it can deliver 72 Arms; this RMS value indicates the heat that the internal IGBTs and bus capacitors must dissipate during steady operation. For acceleration bursts, it supplies up to 140 Arms, giving additional torque headroom for rapid index moves before thermal limits intervene. The converter draws a maximum apparent power of 50 kVA, so upstream circuit protection and cabling must support that loading. A mechanical width of 190 mm simplifies panel layout because it leaves room for airflow channels between adjacent drives while keeping the busbars short.

The control stage is powered from a separate 24 VDC auxiliary supply that maintains logic, STO circuitry, and the front-mounted MMC parameter card even when the main phases are de-energized. Motion commands can arrive over the onboard CANopen port running at 1 Mbit/s, or through the integrated EtherCAT interface when deterministic cycle times are required. The housing stands 385 mm tall and reaches a cabinet depth of 285 mm including connectors, dimensions that align with standard 600-mm deep enclosures. Single-channel STO meets basic safety requirements without adding contactors, and standard PCBs are used because no conformal-coating option is selected. Three supply phases feed the power section, and a 24-V pulse/direction input remains available for legacy indexing controls.