Product Description:

The S7720A-NAF2-F2 servo drive is manufactured by Kollmorgen and belongs to the S700 Servo Drives series. The unit regulates torque, velocity, and position of brushless servo motors in automated production cells, packaging machinery, and material-handling stations, translating line power and control commands into synchronized motor currents. In these roles, it acts as the power stage between the motion controller and the motor, providing real-time amplification and protective functions. This arrangement helps a machine maintain coordinated axis motion while keeping current delivery and fault response inside the drive rather than in separate external modules.

The drive supplies a continuous output of 72 Arms, so medium-power axes can run without derating under normal duty. It draws 50 kVA at that load, and it can deliver 140 Arms briefly during acceleration or short peak demand. The drive requires a minimum motor inductance of 0.61 mH because lower-inductance windings can increase current ripple at the output stage. The power section accepts 208…480 V three-phase input, and a residual voltage drop of 6 V helps limit regeneration spikes. A compact IP20 enclosure surrounds coated circuit boards, while heat is removed through a cold plate and a fan controller card starts the blower at 65 °C ambient or 80 °C heat sink temperature. The integrated brake supply provides 3 A, standby dissipation is 24 W, the design tolerates 85% humidity, and switching edges reach 4.8 kV/µs on the motor leads.

Functional safety is handled by dual-channel STO inputs that cut power to the drive stage without relying on contactors. The first channel reacts within 1 ms, while the second channel meets a 2 ms limit and supports category 3 and SIL 2 stop functions. When the drive operates from a 480 V supply, conduction and switching losses generate 1135 W of heat that the cold plate must remove. That thermal load and response time affect the sizing of power supplies, heat exchangers, and field wiring.