S7720C-NAF2-S3 Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen S7720C-NAF2-S3 is part of the S700 Servo Drives series and operates with a voltage rating of 208 to 480 Volts. This S700 Servo Drive offers a rated current of 72 Arms, peak output of 140 Arms, and a rated input power of 50 kVA. It features EtherCAT and CANopen onboard fieldbus, a coldplate option, and a fan controller expansion card.
Internal Product Review
The S7720C-NAF2-S3 is a Kollmorgen S700 servo drive built for demanding motion systems, with a 72 Arms rated current and 140 Arms peak output current. Onboard EtherCAT and CANopen support streamlines integration across modern control architectures. Dual-channel STO with SIL CL3 gives the drive an especially strong safety profile.
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Product Description:
The S7720C-NAF2-S3 is a Kollmorgen drive from the S700 Servo Drives series that conditions AC mains power and generates controlled three-phase waveforms for synchronous or induction servomotors used in positioning, packaging, and processing lines. Its role in industrial automation is to regulate torque and velocity while exchanging real-time data with master controllers over the integrated EtherCAT and CANopen ports. A cold plate mechanical option allows the power electronics to be clamped to an external heat sink, and a dedicated expansion slot supports a fan controller card for cabinet airflow management.
Electrically, the drive accepts plant supplies between 208–480 V and rectifies them to a regulated DC link that can float from 290–675 VDC. The input bridge is rated for 50 kVA, delivering continuous motor phase current of 72 Arms and permitting peaks up to 140 Arms for rapid acceleration or disturbance rejection. A pulse-width-modulated output stage operates at 8 kHz, a frequency that balances current ripple with switching losses to suit high-performance servo loops. These electrical limits affect compatible motor torque constants and the sizing of upstream protection devices.
Physical and functional safeguards support the power section. The housing carries an IP20 rating, so installation inside a closed control cabinet is required to keep out dust and accidental contact. Dynamic braking energy is absorbed by an external resistor bank rated at 10 ohms and able to dissipate 8 kW, preventing DC bus overvoltage during emergency stops. Dual-channel STO meets SIL CL3 and PLe requirements, providing hardware-based torque suppression for safety gates and emergency stops. Performance audits show a maximum acoustic emission of 68 dB(A) at nominal load, and the design separates safety logic from motion control to maintain deterministic fieldbus traffic.
