S7720F-DNF2-S3 Kollmorgen
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The S7720F-DNF2-S3 is a servo drive produced by Kollmorgen as part of the S700 Servo Drives series. It has a rated current of 72 Arms and supports a rated input power of 50 kVA, with a voltage rating of 208 to 480 volts. The drive comes with a dual channel STO safety feature and features coated PCBs for improved durability. It weighs 13 kilograms and measures 386 mm in height, 244 mm in depth, and 190 mm in width without connectors.
Internal Product Review
The S7720F-DNF2-S3 is a Kollmorgen S700 servo drive with a 72 Arms rated current and a 208...480V voltage rating. Dual channel STO and an 8 kHz switching frequency support dependable safety integration and smooth response in demanding motion systems. Coated PCBs add welcome durability for industrial cabinets, making the drive an excellent choice for high-power servo applications.
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Product Description:
The S7720F-DNF2-S3 is a Kollmorgen servo drive from the S700 Servo Drives series. Acting as the power and control interface between a three-phase supply and a servomotor, it regulates voltage, current, and feedback signals so automated equipment can execute precise velocity, position, and torque profiles. By integrating motion control logic, power conversion, and safety circuitry, the unit simplifies axis setup across conveyors, packaging stations, and articulated robotic cells while maintaining a consistent programming environment.
The drive supplies a continuous motor phase current of 72 Arms, establishing the sustained torque ceiling without thermal derating. It accepts mains potentials from 208 to 480 V, covering common low- and medium-voltage factory grids. Insulated-gate transistors switch at 8 kHz, refreshing motor current every 125 µs to minimize ripple in high-bandwidth applications. During acceleration, the converter can demand up to 50 kVA from the supply, and its internal chopper directs surplus kinetic energy to a braking path that handles 8 kW of continuous power. Cabinet integration is eased by a depth of 244 mm and a width of 190 mm, allowing dense multi-axis layouts.
An external discharge path can be expanded with a 10 ohm brake resistor for higher peak-energy events. With the drive disabled, standby electronics consume just 24 W, simplifying uninterruptible power sizing during emergency stops. Functional safety is provided by a built-in dual-channel STO, enabling SIL 3 torque shutdown without additional relays. The housing weighs 13 kg and stands 386 mm high, which suits installation beneath a controller rack. Conformal-coated printed circuit boards resist moisture and airborne contaminants, and an optional fan-controller card modulates airflow based on heat sink temperature to support service life.
