Product Description:

The S7720C-DNF2-PA is a Kollmorgen servo drive from the S700 Servo Drives series. Designed for panel mounting, it converts three-phase mains energy into precisely regulated current for synchronous and induction motors, making it a central component in high-speed packaging, printing, and material-handling axes. Integrated control logic, power electronics, and safety circuitry allow this single module to close the position loop and coordinate with higher-level machine controllers.

The unit accepts a three-phase supply of 208...480 V and draws up to 50 kVA under full load. From this input, it delivers a continuous phase current of 72 Arms and can surge to 140 Arms for short acceleration intervals. An 8 kHz carrier frequency drives the IGBT bridge to minimize current ripple, while an 80 A line fuse guards the input bus. Thermal losses reach 1135 W at the top of the voltage band, and these losses move into the cold-plate base that is maintained by the machine’s cooling circuit. Control power is taken from a 24 V DC auxiliary rail. Command interfacing is available through a 20 kΩ differential analog input and a ±10 V analog output, enabling legacy velocity or torque references when fieldbus control is not required.

Cold-plate construction, identified by the option detail, offers a surface flatness of 25 µm per 100 mm. The plate must remain below 75 °C, and the internal F2 sensor engages the fan at 65 °C through the dedicated fan-controller expansion card. For braking, the drive supplies a 3 A contact to the caliper, accepts a 10 Ω resistor, and can dissipate 8 kW continuously. Functional safety is provided by Dual channel STO, and network scalability is supported by 64 allowable DeviceNet nodes. These functions allow the servo amplifier to handle energy recovery, maintain stable thermal conditions, and communicate status and faults across the plant network without additional interface modules.