Product Description:

The SC402048001 is a digital servo drive manufactured by Pacific Scientific and positioned in the SC400 Servo Drives series. The unit receives single- or three-phase mains power, rectifies it to a regulated DC bus, and delivers controlled current to brushless servo motors. Within an automation cell, it closes the torque and speed loops, allowing precise positioning, coordinated motion, and rapid cycle execution on pick-and-place stations, packaging lines, and small machining axes.

At 115 VAC line input, the internal bus is raised to 160 VDC, while a 230 VAC source produces a bus of 320 VDC; these fixed levels give the power stage consistent headroom for pulse-width modulation. Continuous motor current is rated at 4.2 A on the lower line and 3.5 A when the higher supply is used, matching the thermal limits of the output transistors. With a 230 VAC feed, the drive can supply up to 1000 W of mechanical power, and the 20 kHz ripple frequency keeps audible noise outside most audible ranges. The front end accepts 115/230 VAC on either one or three phases, so the same model can be wired into fractional-horsepower test benches or multi-axis cabinets without additional transformers.

The current loop closes with a bandwidth of 3 kHz, giving short-cycle machines fast torque correction. Peak events can draw 7.0 A, and the energy reserve allows momentary output of 2000 W before foldback occurs. Command velocity enters as a differential analog signal of ±10 V, and a minimum input impedance of 50 kΩ prevents loading from the upstream controller. A 0.63 V/A monitor pin mirrors load current for oscilloscope tuning, while fault logic can sink 25 mA at 30 VDC to alert PLC safety routines. These interfaces support analog command input, current monitoring, and fault signaling through standard control wiring.