Product Description:

The PC834-109-N is a brushless servo drive produced by Pacific Scientific for the PC800-PCE800 Brushless Servo Drives series. It converts three-phase AC power into a controlled DC bus and pulse-width-modulated output that regulates torque and velocity in permanent-magnet servo motors used on packaging lines, pick-and-place robots, and other position-critical machinery. By integrating current sensing, bus management, and shunt dissipation in a 2.6 kg housing, the unit reduces panel space while maintaining high axis performance.

When supplied from a 240 VAC three-phase source, the drive can deliver continuous shaft power of 3.0 kW while drawing a line current of 12 A. Its converter section sustains a continuous output current of 7.1 A RMS, and the inverter can surge to 21.2 A RMS for rapid acceleration. Energy storage on the DC link is maintained at a nominal bus voltage of 320 VDC, and the silicon devices operate with a power-stage efficiency of 98%, limiting heat buildup in the cabinet. Motors with inductances between 1.25 mH and 1 H may be connected through power cables up to 50 m long without compromising current regulation. For sustained regeneration, an internal shunt handles 800 W and diverts excess energy to an external resistor when required.

The drive provides short-duration output for demanding acceleration events. Its peak power reaches 9.0 kW, allowing the axis to overcome large inertial loads for brief intervals. During power-up, the input stage must tolerate an inrush current of 300 A, so upstream breakers should be sized accordingly. A bus capacitance energy reserve of 40 J smooths voltage dips, and carrier modulation at 16 kHz keeps audible noise low while preserving current-loop bandwidth. The protection circuit can dissipate 12.8 kW during brief regenerative spikes, and controlled DC-link ripple helps protect the motor insulation.