Product Description:

The SC403-004-T4 is a servo drive issued by Pacific Scientific within the SC400 Servo Drives series. It regulates torque and velocity for brushless motors in industrial automation cells, accepting a three-phase 230 V AC supply and converting it to a DC bus for closed-loop control. By combining power electronics, signal conditioning, and feedback interfaces, the unit delivers the commanded motion profiles required in machine tools, material handling lines, and packaging stations.

The power stage is fed by a bus that holds at 320 VDC, and it can supply a continuous phase current of 7.5 A for loads up to 2250 W. Current regulation is executed through a loop with a bandwidth reaching 3 kHz, letting the drive react quickly to load changes while still operating at an efficiency above 90%. The analog velocity channel accepts a ±10 V command with an offset drift of only 50 µV/°C, so speed accuracy is maintained as ambient conditions shift. Internally generated PWM has an output ripple component centered at 15 kHz, which helps reduce audible noise during operation. Protective logic provides a fault-reporting sink of 25 mA at 30 VDC for interface with external controllers. Mechanical width is limited to 4.5 in, allowing dense panel layouts and helping the unit fit into cabinets with closely spaced motion hardware.

During accelerations the drive delivers a peak output current of 15 A and can momentarily transfer 4500 W to the motor. Excess regenerative energy is routed to an internal shunt that handles 40 W continuously and surges to 6000 W without exceeding its thermal limits. For installations that rely on tachometer feedback, the unit supports a gradient of 4.0 V/Krpm, matching common permanent-magnet motor sensors. This feedback option suits systems that use analog speed information to stabilize motor response during repeated starts, stops, and speed changes.