Product Description:

The PC843-XYZ-N is a brushless servo drive produced by Pacific Scientific within the PC800 - PCE800 Brushless Servo Drives series. The unit converts three-phase line power into controlled voltage and frequency so a motion controller can regulate speed and torque on automated axes such as pick-and-place heads, packaging unwinders, or indexing tables. By linking its bus section to regenerative elements, it can also recover excess kinetic energy from decelerating loads. This makes the drive suitable for coordinated motion systems where rapid changes in speed and direction are common.

The unit accepts motion profiles through the SERCOS fiber-optic ring, allowing synchronous updates from a multi-axis controller without additional analog wiring. On a 240 V three-phase supply, its power stage can deliver 1.5 kW continuously while maintaining 3.6 ARMS at the motor terminals. During power-up, the capacitor bank draws an inrush of 300 A that is limited to a 1.5 msec pulse, which helps reduce nuisance tripping of upstream protection devices. The associated line current at rated load is 6 A, and the drive can supply momentary bursts of 10.6 ARMS for rapid acceleration. This combination supports both steady operation and short periods of higher demand.

The shared DC bus can absorb 30 J from load deceleration before external dumping is required, and the internal resistor supports 800 W continuous or 12.8 kW peak regeneration. Motor leads may run up to 50 m, provided total inductance stays within the supported range of 2.0 mH to 2 H. The output carrier of 20 kHz shifts switching noise beyond most audible ranges, and the velocity loop bandwidth is 400 Hz for tight speed regulation. With a power stage efficiency of 98%, thermal loading inside the enclosure is reduced, so standard convection or light fan cooling is usually adequate. These operating values support cabinet-mounted installations that serve remote motors without sacrificing control response.