Product Description:

The S7720A-NAF2-S3 is a servo drive manufactured by Kollmorgen for the S700 Servo Drives series. It conditions three-phase mains power into precise, phase-controlled waveforms that govern synchronous or induction motors in industrial automation. Used on packaging lines, gantry axes, and process equipment, the unit interfaces with motion controllers to execute position, velocity, or torque commands while monitoring current and voltage in real time.

During continuous duty, the amplifier supplies a rated current of 72 Arms, matching the steady-state demands of mid-range servo motors. For acceleration or shock loads, it can deliver a peak output of 140 Arms for 5 s before reverting to nominal ratings. Pulse-width modulation occurs at an 8 kHz switching frequency, limiting motor-current ripple without excessive transition losses. The power section accepts line voltages between 208–480 V, enabling deployment on 230 V or 400 V grids with no hardware changes. Under full load at 400 V, the inverter transistors and snubbers release 1005 W of heat, so adequate cooling or the optional cold plate must be provided. An onboard fan controller card regulates auxiliary blowers, and the design supports a minimum motor inductance of 0.51 mH to maintain current-loop stability.

The input side can draw up to 50 kVA, so upstream protection devices must be sized accordingly. Functional safety is implemented through a dual-channel STO interface that removes gate signals to the IGBTs and produces a safe torque-off state. Acoustic output does not exceed 68 dB(A), keeping noise within typical shop-floor limits. With a footprint of 386 mm × 190 mm × 244 mm and a mass of 13 kg, the drive mounts directly to a control cabinet panel. Additional characteristics include a 6 V residual DC link voltage when disabled, 24 W of standby heat dissipation, support for a 10 Ω external brake resistor, and conformal-coated PCBs for environments with airborne contaminants.