SC403-03-T4 Pacific Scientific
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The Pacific Scientific SC403-03-T4 is part of the SC400 Servo Drives series and operates with an input voltage of 115 or 230 VAC and a continuous current of 7.5 Amps. The drive delivers peak output currents of 15 Amps and has a current loop bandwidth of up to 3 kHz. It offers an efficiency greater than 90 percent and is 4.5 inches wide.
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Product Description:
The SC403-03-T4 is a single-axis servo drive produced by Pacific Scientific for the SC400 Servo Drives series. It converts fixed-frequency mains power into a controlled DC bus and modulated output that regulate the velocity and torque of brush-type servomotors in automated machinery. By closing the velocity loop on a motor-mounted tachometer, the unit supplies precise current to the armature so conveyor sections, pick-and-place heads, or index tables track programmed motion profiles without mechanical overshoot.
This drive accepts a nominal input of 115/230 VAC; the rectifier stage generates 160 VDC from the lower line and 320 VDC from the higher line for energy storage on its bus capacitors. A continuous output capability of 7.5 A supports steady-state loads, while a peak rating of 15 A is available for acceleration bursts or disturbance rejection. The power bridge switches at an output ripple frequency of 15 kHz, keeping current ripple low enough for smooth motor torque. Velocity feedback enters through a 4.0 V/Krpm tachometer gradient, and the open-collector fault output, rated for 30 VDC with a 25 mA sink, signals drive trips to an external controller. The chassis has a width of 4.5 inches, allowing dense panel layouts.
Dynamic behavior centers on a current-loop bandwidth of 3 kHz, letting the controller correct torque errors well inside most mechanical resonance zones. Overall conversion efficiency stays at >90%, which limits cabinet heat rise and reduces power supply loading. At 230 V operation, the bridge can deliver a peak power of 4500 W; the same hardware reaches 2250 W on 115 V and provides a stall power of 2250 W in three-phase mode. The command interface accepts a differential velocity reference of ±10 V, and its typical offset drift of 50 µV/°C keeps idle-speed errors negligible across normal plant temperature changes.
