Product Description:

The SC402-012-T4 servo drive is produced by Pacific Scientific as part of the SC400 Servo Drives series. Designed to regulate brushless motors in industrial automation cells, it converts rectified bus power into controlled three-phase outputs so motion controllers can command speed and torque precisely. The unit fits in control cabinets where closed-loop velocity and current regulation are required for indexing tables, conveyors, or packaging axes, acting as the interface between the higher-level controller and the motor windings.

The drive forms its DC link directly from the mains; with 115 V AC input the link is 160 VDC, while 230 V AC raises it to 320 VDC. It supplies 3.50 A continuously and can reach 7.0 A for short moves. A bandwidth of 3 kHz lets the current loop follow high-frequency torque commands. The monitor jack outputs 0.63 V per ampere up to the 4.4 V ceiling, so a technician can view phase current with an oscilloscope. An auxiliary 10 mA source powers small logic loads, and the open-collector fault line sinks 25 mA at 30 V DC to flag overload or drive shutdown.

For energy delivery, the inverter sustains 1000 W of continuous mechanical power on a three-phase 230 V supply and can reach 2000 W in peak events such as rapid indexing or emergency deceleration. The pulse-width-modulated bridge switches at 20 kHz, keeping acoustic noise above the audible range and reducing torque ripple in low-inductance windings. Command interface is differential, accepting a velocity reference of ±10 V, so integration with analog motion cards is straightforward. The tachsyn feedback gradient of 4.0 V per krpm supports stable speed estimation across the intended range, while the 0.63 V/A current-sense gain aligns the electrical loop with the velocity regulator. Together these attributes let the SC402-012-T4 maintain predictable performance over varied duty cycles.