S7720A-NANA-S4 Kollmorgen
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The S7720A-NANA-S4 is a servo drive manufactured by Kollmorgen as part of the S700 Servo Drives series. It features a peak output current of 140 Arms, a rated current of 72 Arms, and operates with a voltage rating of 208 to 480 Volts. The unit weighs 13 kilograms, measures 386 mm in height, 190 mm in width, and 244 mm in depth without connectors.
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Product Description:
Kollmorgen's S7720A-NANA-S4 belongs to the S700 Servo Drives series and is built for precision motion control in industrial automation. The drive converts three-phase mains power into regulated current loops for brushless servo motors, enabling accurate speed and position control on conveyors, gantries, and packaging axes. EtherCAT and CANopen networks are integrated directly on the drive, which removes the need for separate option cards when linking it to controllers. The dual-channel Safe Torque Off input disconnects power to the motor without removing the supply, supporting Category 3 stops in machine safety circuits.
The housing measures 386 mm in height, 190 mm in width, and 244 mm in depth without connectors, and it weighs 13 kg, allowing dense panel layouts while maintaining sufficient heat sink area. A cold-plate base and conformal-coated PCBs improve thermal conduction and resistance to contamination. The unit accepts up to 50 kVA from a 208–480 V supply and switches the IGBTs at 8 kHz, while voltage transitions reach 4.8 kV/µs. At 400 V, the internal losses are 1005 W during operation and fall to 24 W when the drive is disabled. A built-in 10 Ω braking resistor supports moderate deceleration energy, and an external bus connection is provided if higher absorption is needed. Motors with inductance down to 0.61 mH can be driven stably through the high-bandwidth current loop.
On the power stage, the drive delivers a rated phase current of 72 Arms for continuous motion and can reach 140 Arms for up to 5 seconds to handle accelerations or load shocks. During aggressive deceleration, the brake chopper can dissipate 8 kW continuously when paired with correctly sized external elements. Acoustic output stays below 68 dB(A), supporting installation in operator areas without additional acoustic shielding.
Frequently Asked Questions about S7720A-NANA-S4:
Q: What is the rated input power of the S7720A-NANA-S4 servo drive?
A: The S7720A-NANA-S4 servo drive has a rated input power of 50 kVA, suitable for high-power applications.
Q: What is the peak output current and duration of the S7720A-NANA-S4?
A: This model supports a maximum peak output current of 140 Arms for up to 5 seconds.
Q: What voltage range can the S7720A-NANA-S4 servo drive handle?
A: The S7720A-NANA-S4 operates on a voltage range from 208 to 480V.
Q: Which communication interfaces are included on the S7720A-NANA-S4 without expansion cards?
A: EtherCAT and CANopen communications are available onboard, with no expansion card required.
Q: What safety feature is provided by the STO capability on the S7720A-NANA-S4?
A: This servo drive features a dual channel Safe Torque Off (STO) capability for enhanced safety integration.
