Product Description:

The SC903-050-01 is a servo drive built by Pacific Scientific for the SC900 Servo Drives series. It rectifies and inverts three-phase mains power so a motion controller can command brushless servomotors with precise current regulation. In automated cells, the unit supplies adjustable torque and speed while protecting both the motor and the supply network. This allows smooth response during positioning, indexing, and speed-controlled machine operation.

The drive accepts command signals through analog or incremental digital inputs, permitting either a ±10 V analog velocity reference or quadrature steps. At 25 °C with natural convection, it delivers a continuous phase current of 7.5 A, and it can withstand momentary demands up to 15.0 A for acceleration spikes. On a 240 V three-phase line, the inverter provides 2.2 kW of continuous mechanical power while maintaining 96% conversion efficiency, so less heat is generated inside the cabinet during extended duty cycles. The margin between these current ratings provides more flexibility when matching motor size to duty cycles that alternate between hold, traverse, and settle phases without thermally stressing the IGBT bridge or exceeding winding temperatures.

Motor compatibility is broad because the current loop remains stable with inductances as high as 2 H and as low as 2.0 mH. This range lets the drive work with motors that have very different electrical characteristics while maintaining stable current control. When extra headroom is required, the power stage can supply a peak mechanical output of 4.5 kW from the same supply. The drive does not include a fieldbus, so setup is carried out locally through the chosen interface. This transient capability helps machines clear jams, punch through stiff materials, or accelerate heavy tooling without requiring a larger frame size.