Product Description:

The SC903TN-001-01 is a servo drive manufactured by Pacific Scientific as part of the SC900 Servo Drives series. It conditions three-phase power and closed-loop feedback to regulate brushless servo motors used in positioning tables, pick-and-place systems, and other motion axes where tightly controlled torque, speed, and position are required. It uses standard control software that follows the expected SC900 command structure. This arrangement lets the drive respond quickly to command changes while maintaining stable axis control during indexing and repeatable positioning tasks.

This unit accepts motion commands through an analog or incremental digital interface, allowing either ±10 V velocity loops or step-and-direction pulse streams from a PLC or motion card. Under natural convection at 25 °C, it can deliver a continuous phase current of 7.5 A, translating to steady electromagnetic torque without overheating. When operated from a 240 V three-phase source, the continuous mechanical output reaches 2.2 kW, supporting mid-range servo motors in packaging or material-handling machinery. Thermal management relies on a fanless, convection-cooled chassis, so the absence of forced airflow simplifies cabinet layout but requires free air space around the heatsink. During rapid accelerations, the power section can supply a peak line-to-line current of 15.0 A, enabling short bursts of torque for overcoming inertia or friction.

A transient move at 240 VAC can draw on a mechanical ceiling of 4.5 kW, providing a clear margin between nominal and surge demands. Conversion losses are minimized by a power-stage efficiency of 96%, which lowers cabinet heat load and improves overall system energy use. Motor selection is guided by the permissible inductance window. Windings can be as high as 2 H or as low as 2.0 mH phase to phase, allowing the SC903TN-001-01 to drive both high-torque, low-speed and low-torque, high-speed servomotor designs without current loop instability.