S7720F-NAF2-F2 Kollmorgen
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The Kollmorgen S7720F-NAF2-F2 is part of the S700 Servo Drives series and has a rated input power of 50 kVA and a voltage rating from 208 to 480 volts. This servo drive measures 386 mm in height, 190 mm in width, and 244 mm in depth, and weighs 13 kilograms. It features a peak output current of 140 Arms, rated current of 72 Arms, and includes dual channel STO capability along with a coated PCB finish.
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Product Description:
The S7720F-NAF2-F2 is a digital servo drive produced by Kollmorgen for the S700 Servo Drives series. Mounted inside a control cabinet, it delivers controlled three-phase power to servo motors used in packaging machines, robotics, and material-handling axes. By combining current regulation, fieldbus connectivity, and integrated safety, the drive serves as the primary motion element in many automated installations. It is intended for applications that require precise speed and torque control during repeated acceleration, deceleration, and positioning tasks.
The device accepts three-phase mains from 208 to 480 V and can draw up to 50 kVA from the supply. Its power stage delivers a continuous motor current of 72 A RMS, while transient demands are handled with a peak capability of 140 A RMS. The IGBT bridge switches at 8 kHz, which supports smooth current control and stable motor response. A residual voltage drop of 6 V helps limit internal conduction loss, and only 24 W of heat are produced when thermal dissipation is disabled. The optional fan-controller expansion card starts internal air circulation at 65 °C and turns on the heat sink blower at 80 °C to manage component temperature. Rated switching elements also allow an external brake to absorb regenerated energy without forcing an immediate shutdown of the DC link.
The housing measures 386 mm high, 190 mm wide, and 244 mm deep, and it weighs 13 kg. Operating noise remains below 68 dB(A) even when the cooling fans run at full speed. Excess kinetic energy is dissipated by an external resistor rated at 10 ohms, matched to the integrated chopper and the stated brake power capability. Motion can be disabled safely through a dual-channel STO circuit that removes torque-producing pulses without cutting main power. Production units are supplied with coated PCBs, and standard or coated PCB versions are available for installations that need different levels of board protection. The chassis depth and low standby loss help the drive fit into sealed enclosures with limited internal airflow.
Frequently Asked Questions about S7720F-NAF2-F2:
Q: What is the rated current for the S7720F-NAF2-F2 servo drive?
A: The S7720F-NAF2-F2 servo drive is capable of a rated current of 72 Arms during continuous operation.
Q: What is the maximum peak output current of the S7720F-NAF2-F2?
A: The peak output current for this model reaches up to 140 Arms, allowing for high dynamic load demands.
Q: What voltage range can the S7720F-NAF2-F2 operate within?
A: This servo drive is designed to accept a voltage input ranging from 208 to 480 V.
Q: What type of STO capability is available on the S7720F-NAF2-F2?
A: The S7720F-NAF2-F2 features a dual channel STO (Safe Torque Off) capability for enhanced system safety.
Q: What expansion card comes standard with the S7720F-NAF2-F2 servo drive?
A: A fan controller is provided as an expansion card in this servo drive model.
