S7720F-SEF2-PA Kollmorgen
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The Kollmorgen S7720F-SEF2-PA is a servo drive from the S700 Servo Drives series, featuring a voltage rating of 208 to 480 Volts and a rated input power of 50 kVA. It offers a rated current of 72 Arms and a peak output current of 140 Arms, with continuous brake power at 8 kW. The drive supports dual channel STO safety capability and includes standard and coated PCBs.
Internal Product Review
The S7720F-SEF2-PA is a Kollmorgen S700 servo drive with a 72 Arms rated current and 140 Arms peak output current, making it well suited for demanding motion-control tasks. Dual-channel STO and 208...480 V operation give the unit strong safety value and welcome integration flexibility. Strong current capability makes the drive an excellent choice for dynamic servo applications.
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Product Description:
The S7720F-SEF2-PA is a Kollmorgen servo amplifier belonging to the S700 Servo Drives series. It serves as the power stage between a motion controller and three-phase motors, converting mains energy into precisely modulated current for industrial axes that require tight torque, speed, and position control. Installed in automation cabinets for packaging, robotics, or material-handling equipment, the unit supports safety-related stop functions while using expansion cards and coated circuit boards for demanding plant environments.
The drive accepts a mains window of 208–480 V, allowing deployment on low-voltage or high-voltage networks without transformer adaptation. Within that input envelope, its supply section is rated for 50 kVA, illustrating the maximum apparent power it can draw during full-load operation. The power stage delivers a continuous phase current of 72 Arms, and for rapid acceleration or disturbance rejection it can furnish a peak of 140 Arms for short intervals. Pulse-width modulation is generated at 8 kHz, which minimizes current ripple in the motor windings and improves acoustic performance. When kinetic energy must be dissipated quickly, a 10 Ω external brake resistor can be wired to the terminals, and an internal brake section manages regenerative thermal loading.
An analog input with 20 kΩ impedance allows velocity or torque commands from legacy control hardware, while the feedback channel offers ±10 V output granularity down to 0.38 mV, supporting high-resolution diagnostics. The internal chopper can absorb up to 8 kW of continuous regenerative power, protecting the DC link when large inertial loads decelerate. Functional safety is handled by a hardware-implemented dual-channel STO circuit; STO1 reacts within 1 ms and STO2 within 2 ms, removing drive energy without affecting external control logic. A fan-controller expansion card manages airflow when standard or coated PCBs are fitted, maintaining temperature limits during rated-current operation.
