Product Description:

The S7720C-NAF2-F2 is classified by Kollmorgen as an S700 Servo Drive within the S700 Servo Drives series. Designed to sit between the plant supply and a synchronous or induction motor, it rectifies, stores, and re-inverts power so axis motion follows the commands of a higher-level controller. In packaging, printing, or assembly equipment, the drive delivers fast current loops and functional safety while supporting a cold-plate mounting surface for simplified cabinet cooling.

Input flexibility begins with a line range of 208–480 V, protected upstream by an 80 A AC supply fuse. Under that supply the inverter can source 72 Arms continuously, a level corresponding to 50 kVA of apparent power for high-inertia loads. The power stage switches at 8 kHz, and the resulting current form factor of 1.01 keeps RMS heating close to average current. A ±10 V differential analog input lets an external controller impose torque or velocity commands, while the electronics section draws only 2 A to power logic and I/O. Safe deceleration is aided by a 10 Ω external brake resistor, and motor compatibility extends down to 0.51 mH of phase inductance. To limit dv/dt stress, the output rise at 400 V is held to 4.0 kV/µs and the residual voltage drop across the transistors is 6 V.

Thermal planning is supported by quantified losses: under full load at 400 V the drive dissipates 1005 W, while in standby it releases only 24 W. With a continuous brake power capability of 8 kW the internal chopper can absorb kinetic energy without exceeding the allowed 30 switch-on events per hour. A cold-plate option diverts this heat directly to a panel or liquid cooler, and a fan-controller expansion card can modulate airflow as needed. Functional safety is provided through a dual-channel STO that removes torque-producing energy without affecting fieldbus communication.