Product Description:

The SC402-023-T4 is a servo drive manufactured by Pacific Scientific within the SC400 Servo Drives series. The unit converts the plant’s AC mains into a regulated DC bus and delivers closed-loop velocity and torque control to DC servo motors used on pick-and-place axes, conveyors, and other position-critical stages in automated machinery. By combining inner current regulation with tachometer feedback, it maintains commanded speed despite load transients.

The drive accepts a differential velocity reference of ±10 V that is applied to a 50 kΩ input, ensuring minimal loading of upstream motion controllers. That command first passes through a 1000 Hz filter so high-frequency noise does not modulate motor speed. Internally, the current loop can respond up to 3 kHz, allowing the amplifier to reject mechanical disturbances quickly, while the power stage operates with a 20 kHz output ripple frequency that pushes switching artifacts beyond the audible range. Tachometer feedback is conditioned by a 1200 Hz filter and accommodated over a ±9 V span, and the input presents at least 20 kΩ impedance so long cable runs do not distort the signal. With the T4 option, the drive interprets feedback at 4.0 V/Krpm, letting the velocity loop calculate motor speed directly from the tachometer gradient.

Current capability indicates the mechanical work the amplifier can support. It delivers a continuous armature current of 3.50 A and can sustain 7.0 A during acceleration or shock loads without saturating the bus capacitors. The operator may command those levels over a ±4.2 V span, and the front-panel monitor returns motor current on a 0–0.63 V/A scale with a 4.4 V full-scale value for quick calibration. Protection outputs are provided through an open-collector sink rated at 30 VDC and 25 mA, enabling fault signaling to a PLC. All energy is drawn from the nominal 320 VDC bus derived from the facility’s 230 VAC mains.