Product Description:

The S7720A-SEF2-S3 is a compact S700 servo drive built by Kollmorgen for use in multi-axis machinery where rapid torque changes and integrated safety are essential. The device functions as the power amplifier that links a central motion controller to brushless servomotors, providing controlled current loops and regenerative handling for precision positioning tasks. It belongs to the S700 Servo Drives series, and its dual-channel STO hardware allows a safe torque-off state without extra contactors, supporting compliance with category-oriented safety circuits in industrial automation. This arrangement helps reduce extra safety wiring while keeping axis shutdown fast and predictable.

The drive accepts a three-phase supply across the 208...480 V range and converts it into motor phase pulses switched at 8 kHz, a frequency that influences current ripple and audible tone. Under continuous operation, it can deliver 72 Arms, while momentary demands are supported up to 140 Arms, enabling short bursts of high acceleration. Mains front-end sizing is aided by the rated input power of 50 kVA, which helps match the drive to transformer and circuit-breaker ratings. A continuous brake power capability of 8 kW permits dynamic braking when paired with a 10-ohm external resistor. The SERCOS II fieldbus provides deterministic communication for cycle-synchronous command updates and keeps motion data synchronized across coordinated axes.

The enclosure has an IP20 rating and measures 190 mm wide, 386 mm high, and 244 mm deep, so it installs in standard 300 mm cabinets with front clearance for plug-in connectors. Weight is 13 kg, which eases handling during panel maintenance. The integrated fan starts when the heat sink reaches 80 °C, and at 400 V the unit dissipates 1005 W of heat. An optional cold plate with coated PCBs improves convection in contaminated atmospheres. Maximum acoustic output remains below 68 dB(A), and the dedicated fan-controller expansion card supervises airflow and reports any stall or blockage through SERCOS diagnostics.