Product Description:

The S7720C-NAF2-PA is a digital servo drive manufactured by Kollmorgen for the S700 Servo Drives series. It converts three-phase mains power into regulated output for torque, speed, and position loops on industrial robots, conveyors, and processing equipment. Kollmorgen integrates this model into modular control panels where space is limited and multiple axes must be synchronized by compact, high-performance amplifiers.

It accepts three-phase supplies from 208 to 480 V and can draw up to 50 kVA under rated load. The power stage delivers a continuous motor phase current of 72 Arms and rises to 140 Arms for bursts lasting 5 seconds, enabling rapid acceleration without overheating. A switching frequency of 8 kHz modulates the IGBTs to minimize torque ripple, while the residual DC-link drop is limited to 6 V for accurate bus regulation. The current form factor of 1.01 indicates near-sinusoidal output, reducing harmonic stress on connected motors. With these electrical limits, the unit can energize medium-frame servomotors while maintaining junction temperatures within normal operating margins.

A built-in thermal path and the cold plate option allow heat to transfer directly to a shared coolant plate, and the fan-controller expansion card regulates forced air when cabinets rely on airflow. The drive handles regenerative energy with 8 kW of continuous brake capacity and an external 10 Ω resistor connection. Safety wiring is simplified by the dual-channel STO feature, which provides redundant, contact-free shutdown paths. Command accuracy is high; the analog velocity or torque input offers 1.25 mV granularity, 20 kΩ input resistance, and a 62.5 µs update rate, while the monitor output refreshes every 250 µs with 0.38 mV resolution. These interface characteristics support high-bandwidth position loops in coordinated multi-axis cells.