S7720C-DNF2-NA Kollmorgen
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The Kollmorgen S7720C-DNF2-NA is a servo drive from the S700 Servo Drives series, offering a drive power capacity of 50000 Watts and voltage rating of 208 to 480 Volts. It features a controlled fan cooling option, IP20 enclosure protection, and supports onboard communication via EtherCAT and CANopen. The servo drive has a rated current of 72 Arms and a peak output current of 140 Arms.
Internal Product Review
The S7720C-DNF2-NA is a Kollmorgen S700 servo drive with 50 kW drive power capacity and a 208...480V rating. DeviceNet fieldbus support and onboard EtherCAT & CANopen streamline integration across mixed control architectures. Dual-channel STO and 140 Arms peak output current make the unit a strong choice for high-performance motion systems.
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Product Description:
The S7720C-DNF2-NA is a servo drive manufactured by Kollmorgen and supplied within the S700 Servo Drives series. It converts three-phase AC mains into precisely regulated motor currents for coordinated motion control. This supports torque, speed, and position control in packaging lines, robotics cells, and other automated machinery that rely on tightly synchronized operation.
The drive accepts input across a wide operating band of 208 to 480 V and is built to process up to 50 kVA of apparent power from the supply. Under rated conditions, it delivers a continuous output of 72 Arms, while its peak current reaches 140 Arms during short acceleration bursts or rapid deceleration demands. Internal power electronics can transfer as much as 50,000 W to a connected motor, and at the top of the voltage range the minimum motor inductance is 0.61 mH, so windings below this value may require a series reactor. A controlled fan cooling option channels airflow through the heat sink, the enclosure has an IP20 rating for installation inside a control cabinet, auxiliary 24 VDC keeps the logic active during mains interruptions, and a dual-channel STO circuit permits safe torque removal without mechanical relays.
An overvoltage trip activates at a DC bus level of 900 V to protect the IGBTs, and excess regenerative energy can be routed to an external 10 Ω brake resistor rated for 8 kW. During continuous full-load operation, the module dissipates 1135 W as heat, and a cold-plate option can transfer that loss directly to a machine frame or liquid cooler. Communication with the plant network is available through the integrated DeviceNet fieldbus, while high-speed motion commands and diagnostics are exchanged over EtherCAT and CANopen. Noise emission does not exceed 68 dB(A) at one meter, and a dedicated fan-controller expansion card adjusts blower speed to match thermal demand.
