Product Description:

The PCE845-XYZ-A brushless servo drive is produced by Pacific Scientific as part of the PC800 – PCE800 Brushless Servo Drives series. It serves as the power conversion and control layer between a plant’s AC mains and a permanent-magnet servo motor, generating regulated three-phase current while exchanging real-time motion data with the machine controller. Within automated packaging machines, pick-and-place gantries, or indexing tables, the unit executes torque, speed, or position loops so that the connected axis follows commanded trajectories with cycle-to-cycle repeatability.

The drive accepts motion commands through a SERCOS fiber-optic link, allowing synchronized updates on a deterministic bus. Under steady load the power stage can deliver 7.5 ARMS continuously, while short duty acceleration or disturbance rejection is handled by a peak reserve of 22.5 ARMS. Copper losses remain low because the inverter runs at a measured efficiency of 97%, limiting thermal rise inside the 254 mm × 146.7 mm housing. Excess kinetic energy returned from decelerating axes is absorbed by the integral shunt regulator, which can dissipate momentary surges up to 20 kW into an external resistor network. The current loop accommodates motors whose phase-to-phase inductance ranges from 1.7 mH to 1.7 H, giving designers flexibility to pair high-inertia or low-inductance rotors without compromising loop stability.

An internal regeneration circuit rated at 100 W handles continuous braking energy and routes it through a factory-installed 33 Ω resistor. Motor leads may be routed up to 50 m from the cabinet before propagation delay or reflected waves exceed drive limits, and the output filter switches at 16 kHz so that current ripple remains outside the mechanical bandwidth of most servo systems. With a mass of 4.2 kg and a depth of 192 mm, the unit fits densely populated enclosures while maintaining airflow clearance behind adjacent drives.