Product Description:

The SC403-012-T2 is a servo drive produced by Pacific Scientific within the SC400 Servo Drives series. It regulates current and velocity for permanent-magnet motors used in industrial automation cells, packaging lines, and material-handling axes. By converting the single- or three-phase mains supply into a regulated DC bus and pulse-width-modulated output, the unit provides closed-loop torque and speed control to the connected servo motor.

When powered from 115 VAC, the internal rectifier establishes a bus of 160 VDC, while a 230 VAC supply produces a higher bus of 320 VDC; these two levels set the available motor voltage for low- and high-line installations. The drive can deliver a continuous phase current of 7.5 A, which equates to a sustained mechanical output of 2250 W on a 230 VAC three-phase mains supply. Pulse modulation is performed at an output ripple frequency of 15 kHz, keeping current distortion above the audible range and reducing motor torque ripple. A sinking fault transistor is provided; it can draw 25 mA at up to 30 VDC so that external controllers receive an active-low alarm. Command signals are differential ±10 V, and the analog offset drifts only 50 µV/°C to maintain velocity accuracy over temperature.

During accelerations, the drive supplies a peak current of 15 A, enabling short bursts of up to 4500 W mechanical power. Regenerated energy is absorbed by an internal shunt that dissipates 40 W continuously and can handle a momentary surge of 6000 W without exceeding its thermal limit. Speed feedback from a tachometer is supported through a gradient of 1.0 V/Krpm, simplifying gain selection in velocity loops. Additional characteristics include a 4.5 in chassis width for dense panel layouts and a velocity command input that is linear across the full ±10 V range.