SC423-402-T4 Pacific Scientific
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The Pacific Scientific SC423-402-T4 is a servo drive from the SC400 Servo Drives series with a peak output current of 7.0 Amps and a peak power of 2000 Watts at 230 Vac. It operates at bus voltages of 160 VDC for 115 Vac and 320 VDC for 230 Vac, and features an output ripple frequency of 20 kHz. Its efficiency is over 90 percent and the current loop bandwidth reaches up to 3 kHz.
Internal Product Review
The SC423-402-T4 is a Pacific Scientific SC400 servo drive with >90% efficiency and 1000 W continuous power at 230 Vac three-phase. A 3 kHz max current loop bandwidth and 7.0 A peak output current support responsive servo tuning and strong transient handling. A very capable drive for motion applications requiring efficient power conversion and stable dynamic performance.
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Product Description:
The SC423-402-T4 is a servo drive built by Pacific Scientific for motion systems that use the SC400 Servo Drives series. The unit converts single- or three-phase mains power into controlled DC power for permanent-magnet servomotors, delivering the velocity and torque commands needed in automated machinery and robotics. As a drive module, it regulates motor current and speed, closes the velocity loop with a tachometer feedback signal, and reports operating faults to the supervisory controller.
When the line supply is 115 VAC, the internal bus reaches 160 VDC; on a 230 VAC line, it rises to 320 VDC. Continuous motor current is limited to 4.2 A at 115 VAC and 3.5 A at 230 VAC. These limits keep the device within its thermal envelope, while the motor-current form factor remains below 1.01. With a three-phase 230 VAC supply, the drive can provide 1 kW of continuous electrical power, and its conversion efficiency exceeds 90 percent, reducing the heat load inside control cabinets. The switching bridge operates at an output ripple frequency of 20 kHz, which minimizes audible noise and lowers motor torque ripple. An open-collector fault output rated for 30 VDC and 25 mA allows simple wiring to drive-ready indicators or PLC inputs.
For dynamic moves, the output current can momentarily rise to 7.0 A, supporting acceleration bursts with a peak output of 1000 W on 115 VAC lines and 2000 W on 230 VAC lines. The analog current loop has a bandwidth of up to 3 kHz, enabling tight tracking of high-speed command profiles during transient operation. Velocity commands are accepted as ±10 V, and the offset drifts by only 50 µV per °C, maintaining repeatability across a wide temperature range. A tachometer gradient of 4.0 V per krpm matches common DC tachogenerators and simplifies feedback scaling in a variety of motion systems.
