S7720C-NAF2-S4 Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen S7720C-NAF2-S4 is a servo drive in the S700 Servo Drives series with a voltage rating of 208 to 480 volts and a rated input power of 50 kVA. The drive offers a rated current of 72 Arms, a peak output current of 140 Arms, and features enclosure protection rated at IP20. It supports EtherCAT and CANopen onboard networks and includes a dual channel STO capability.
Internal Product Review
The S7720C-NAF2-S4 is a Kollmorgen S700 servo drive with EtherCAT and CANopen onboard networks. Rated current of 72 Arms and peak output current of 140 Arms support strong dynamic performance in demanding motion applications. Dual channel STO and IP20 protection make this unit a very capable choice for safety-conscious cabinet installations.
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Product Description:
The S7720C-NAF2-S4 servo drive is engineered by Kollmorgen within the S700 Servo Drives series. It amplifies command signals and modulates three-phase output to synchronous or induction servomotors, making it a core element for motion axes in packaging, assembly, and process equipment. The controller uses field-oriented regulation and high-resolution feedback to maintain tight speed and position accuracy under dynamic loads and changing axis demands.
Electrically, the drive accepts a three-phase mains range of 208–480 V and can draw up to 50 kVA of apparent power at full load. Under continuous operation, it delivers 72 Arms, while momentary demands are supported by a 140 Arms peak envelope that provides headroom for acceleration events. The insulated-gate bridge commutates at 8 kHz, a frequency that balances dynamic response with manageable switching losses. The output current has a form factor of 1.01, which helps limit motor heating. A residual voltage drop of 6 V is present between the DC bus and motor terminals, and the unit is rated for 30 commanded switch cycles per hour when used with its coldplate heat sink. An IP20 protection rating allows cabinet mounting with controlled airflow.
Thermal behavior can be moderated by the optional fan controller expansion card when additional airflow management is required. With the power stage disabled, dissipation falls to 24 W, minimizing standby cabinet heating, whereas full-speed operation at 400 V produces 1005 W that must be removed by the machine’s cooling loop. Acoustic output remains within 68 dB(A), supporting installation near production lines without excessive noise. Integrated communication ports provide EtherCAT & CANopen connectivity for real-time drive commands and diagnostics, and the dual-channel STO circuit provides fail-safe torque isolation during emergency stop events. This arrangement supports safe integration into compact control cabinets without additional external adapters.
