Product Description:

The S7720A-FBF2-NA is a Kollmorgen servo drive in the S700 Servo Drives series. It interfaces between a three-phase mains supply and synchronous or induction motors to regulate torque, speed, and position in automated machinery. By combining high-power switching hardware with integrated safety and feedback supplies, the unit functions as a compact axis controller for packaging lines, material-handling gantries, and other motion applications that require fast response and electronic torque limits.

The drive carries a continuous phase current of 72 Arms, so the thermal design must accommodate that conductor load during steady operation. The mains connection can support up to 50 kVA, which reflects the apparent power required by the installation, including reactive components generated by the inverter stage. The permissible input range spans 208–480 V, allowing the same hardware to run on common North American and international plant voltages without tap changes. Internal IGBTs commutate at 8 kHz, which helps reduce motor acoustic noise while keeping transistor losses within the listed thermal dissipation of 1,135 W at 480 V. For acceleration bursts or shock loads, the current can rise to 140 Arms, and the drive requires a minimum motor inductance of 0.61 mH at 480 V to limit overcurrent peaks during such events. A 5 V feedback rail rated at 300 mA and an X33 encoder supply rated at 500 mA power position sensors directly from the drive.

An upstream fuse of 80 A provides short-circuit protection for the AC input. Mechanical energy returned during deceleration can be absorbed continuously at 8 kW, or routed through an external brake resistor rated at 10 ohms when additional thermal capacity is needed. The cold-plate base and coated PCB option improve heat transfer and tolerance to contaminants, while the integrated fan-controller expansion card modulates airflow as heat sink temperature changes. Dual-channel STO supports safety-related stop functions without removing mains power, and maximum noise emission is limited to 68 dB(A) to support plant sound targets. During each PWM transition, the DC bus voltage edge is limited to 4.8 kV/µs, which reduces stress on motor insulation and attached EMC filters.