Product Description:

The S7720F-SNF2-S4 is a Kollmorgen drive module in the S700 Servo Drives series. It regulates torque, speed, and position of compatible AC servo motors in automated machinery and closes the feedback loop internally so commanded motion can be tracked with stable servo performance across indexing, transfer, and positioning tasks. Integrated safety functions also help remove torque when required, so the drive can support controlled motion as well as protective stopping behavior in industrial equipment.

The drive accepts a line supply of 208 to 480 V from three-phase power and is intended for cabinet installations where the source can support the converter and connected motor load. Under continuous operation, it provides a phase current of 72 Arms, while transient events such as acceleration or load shocks can be handled with a peak output of 140 Arms. The incoming power can deliver 50 kVA to the installation, and current is modulated through an IGBT bridge that switches at 8 kHz, balancing dynamic response with thermal losses. The power stage is intended for motors with an inductance of at least 0.61 mH at 480 V, and returned braking energy can be routed to an external 10 Ω resistor instead of remaining in the DC bus. A temperature-controlled fan controller manages airflow automatically, while a SynqNet interface in slot 1 handles communications and an S2-2 safety card in slot 3 works with the dual-channel STO function.

During high-energy stops, the internal circuit can direct up to 70 kW of pulse brake power to the resistor, while continuous heat generation is limited to 1135 W. With connectors fitted, the enclosure is 285 mm deep and 505 mm high, and the assembled unit weighs 13 kg. This drive uses coated PCBs, which help protect conductive traces from moisture and contaminants in harsher cabinet conditions. The added coating is applied to this unit and supports reliable operation where airborne contamination may be present inside the enclosure.