S7720C-SEF2-S4 Kollmorgen
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The Kollmorgen S7720C-SEF2-S4 servo drive is part of the S700 Servo Drives series and features a rated input power of 50 kVA with a voltage rating from 208 to 480V. It has a continuous brake power of 8 kW, rated current of 72 Arms, and a dual channel STO safety feature at SIL CL2 / PLd level. The drive measures 386 mm in height, 190 mm in width, and 244 mm in depth without connectors, and weighs 13 kg.
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Product Description:
The S7720C-SEF2-S4 is a servo drive manufactured by Kollmorgen within the S700 Servo Drives series. It converts a three-phase mains supply into controlled motor voltage and current so that axial, rotary, or gantry systems follow programmed motion profiles. In industrial automation cells, the device functions as the power stage between the motion controller and the motor, allowing rapid acceleration, smooth speed regulation, and repeatable positioning for packaging lines, machining centers, and material-handling robots. Its integrated control electronics, safety features, and expansion options make it suitable for continuous 24/7 plant operation where uptime and accuracy are critical.
The drive can deliver a continuous output of 72 Arms to the motor windings, which is the maximum RMS phase current available during steady production runs. It accepts mains in the range of 208 to 480 V, allowing the same model to be used on either low- or high-voltage factory distribution networks. The pulse-width-modulated inverter switches at 8 kHz, and this high carrier frequency reduces current ripple and minimizes audible motor noise. Real-time setpoints and diagnostics are carried over the SERCOS II fiber-optic fieldbus, enabling deterministic communication with multi-axis controllers. Functional safety is built into the power stage and control logic, achieving SIL CL2 / PLd. Rated input power of 50 kVA, a minimum motor inductance of 0.61 mH at 480 V, and 8 kW of continuous brake power complete the electrical performance range.
The housing weighs 13 kg, which helps support cabinet installation. Overall width is 190 mm, and the depth without rear connectors is 244 mm, allowing two drives to mount side by side in 600 mm deep enclosures while maintaining airflow. When dynamic braking energy exceeds what can be dissipated internally, an external resistor of 10 ohms can be connected to the dedicated terminals. The Safe Torque Off function uses dual-channel STO, which isolates the gate signals to the IGBTs and removes torque within milliseconds. Disabled-state dissipation is only 24 W, and an optional coldplate plus a fan-controller card supports alternative thermal management strategies in densely packed servo cabinets.
Frequently Asked Questions about S7720C-SEF2-S4:
Q: What is the rated continuous output current for the S7720C-SEF2-S4 drive?
A: The S7720C-SEF2-S4 servo drive is rated for 72 Arms continuous output current.
Q: What type of fieldbus interface does the S7720C-SEF2-S4 support?
A: This drive features a SERCOS II fieldbus interface for communication.
Q: What STO safety capability is provided on the S7720C-SEF2-S4 servo drive?
A: The S7720C-SEF2-S4 supports a dual channel Safe Torque Off (STO) feature.
Q: What is the rated input power specification for the S7720C-SEF2-S4 drive?
A: The S7720C-SEF2-S4 can handle a rated input power of up to 50 kVA.
Q: What voltage range is supported by the S7720C-SEF2-S4 servo drive?
A: This model operates with a supply voltage range from 208 V to 480 V.
