Product Description:

The SC403-027-T3 is a digital servo drive produced by Pacific Scientific within the SC400 Servo Drives series. Designed for industrial automation, the unit interfaces with permanent-magnet servo motors, regulates torque and velocity, and links motion axes to PLC logic. By converting fixed mains power into a controlled DC bus and high-frequency PWM output, the drive supplies precise current and speed control for packaging machines and pick-and-place gantries.

The drive accepts a nominal supply of 115/230 VAC, and the internal rectifier converts it to 160 VDC or 320 VDC on the DC bus, depending on the selected line voltage. With this energy store, the power stage can deliver a continuous phase current of 7.5 A, while short-duration overloads can draw up to 15 A without triggering a shutdown. When operated from a 230 V source, the inverter sustains 2250 W of continuous mechanical power at the motor shaft. A 3 kHz maximum current-loop bandwidth helps minimize following error, and the 15 kHz output ripple frequency places switching noise above most audible ranges. The velocity command port tracks ±10 V analog references, and typical offset drift is held to 50 µV/°C to support long-term speed accuracy. Fault signaling is provided through a transistor sink rated at 25 mA with a 30 VDC limit.

During rapid acceleration, the drive can double its steady output, supplying 4500 W of peak mechanical power and absorbing excess regenerated energy through an internal shunt that tolerates 6000 W in brief bursts. Tachometer feedback is supported with a gradient of 2.0 V/Krpm, giving a direct velocity-proportional voltage for closed-loop control. Combined with the 3 kHz loop response, this supports accurate positioning and stable speed regulation. The enclosure measures 4.5 in wide, enabling high-density panel layouts alongside other SC400 modules. The fault sink provides a single open-collector alarm output for integration with PLC logic.