Product Description:

Kollmorgen's S74802-DNF2-S3 is a servo drive in the S700 Servo Drives series. The unit conditions three-phase input power and supplies regulated current to servo motors used in feeders, gantries, and precision tooling. Acting as the link between the motion controller and the machine's actuators, it regulates acceleration, braking, and deterministic position control in industrial automation tasks. It integrates power conversion, fieldbus communication, and safety functions in a single enclosure, which helps simplify cabinet layouts.

It operates from a supply range of 208 to 480 V, drawing up to 35 kVA while providing a continuous output current of 48 Arms. For transient load peaks, the current can rise to 96 Arms, allowing short bursts of mechanical power without thermal overload. A current form factor of 1.01 indicates a near-ideal sinusoidal phase current shape, which helps limit motor heating and electromagnetic interference. DeviceNet connectivity handles cyclic setpoint exchange and diagnostics, while an onboard fan controller manages the controlled-fan cooling option. Motors with inductances as low as 0.74 mH at 400 V remain stable, and a 15 Ω external brake resistor is available for additional dynamic energy absorption.

The acoustic output stays below 62 dB(A), which helps reduce audible noise in open equipment bays. During deceleration, the internal chopper accepts up to 8 kW of brake power, and the heat sink releases about 685 W at 480 V under full load. The power stage switches at 8 kHz, balancing switching loss and current fidelity while maintaining a 6 V residual voltage drop. The S3 safety card implements dual-channel STO, and the switch-on frequency is limited to 30 cycles per hour to protect semiconductor elements. Standard PCBs, controlled-fan airflow, and the fan controller support heat management without requiring auxiliary cooling hardware.