Product Description:

The PC842-XYZ-A is a brushless servo drive produced by Pacific Scientific within the PC800–PCE800 Brushless Servo Drives series. The unit converts digitally commanded velocity or torque references into three-phase power for permanent-magnet servo motors used in conveyors, pick-and-place gantries, and other automated machinery. By integrating power electronics, feedback processing, and network communications in a compact chassis, it forms the interface between higher-level motion controllers and the mechanical load.

The drive exchanges setpoints and diagnostics over the SERCOS Network, which simplifies fiber-optic cabling and provides deterministic timing. It delivers a continuous phase current of 2.7 ARMS and can supply up to 5.3 ARMS for short accelerative bursts, enabling headroom for load changes. A velocity loop bandwidth of 400 Hz combined with a loop update period of 250 µSec supports precise speed regulation at low following error. To protect the power stage, the connected motor must present at least 4.0 mH of line-to-line inductance. Internally generated switching artifacts are centered at an output ripple frequency of 20 kHz, which helps keep audible noise low. The housing measures 88.1 mm in width, 158 mm in depth, and 198.1 mm in height, allowing integration into control panels.

For feedback, the amplifier accepts resolver signals excited at 6510.42 Hz and interpolates up to 16384 PPR, while its digital converter yields 24 bits/rev of angular information for commutation and positioning. Motor leads can run as far as 50 m without performance loss, which eases the layout of distributed axes and remote motor placement inside larger machines. An isolated relay contact rated at 30 Vdc and 1 A is provided for drive-ready or fault indication to external interlocks, so status signals can be passed to supervisory controls without a direct electrical connection. Total mass is only 1.9 kg, so cabinet rail loading remains light during multi-axis installations.