Product Description:

The PC842-XYZ-F is a brushless servo drive produced by Pacific Scientific within the PC800–PCE800 Brushless Servo Drives series. It converts a 240 V AC three-phase supply into a regulated DC bus for permanent-magnet servomotors and manages torque, velocity, or position loops received from the controller. In an industrial automation cell, the unit provides networked motion control so axes follow coordinated profiles set by the central controller. By integrating the power stage and feedback processing hardware, it reduces panel wiring and simplifies setup.

At a continuous output current of 2.7 ARMS, the drive can supply power within thermal limits to low-inertia servomotors, while the overload margin reaches 5.3 ARMS for short-duration acceleration. Its internal bus operates at 320 VDC, giving adequate headroom for high back-EMF motors. Current is pulse-width modulated at 20 kHz, which moves switching noise above the acoustic band and helps reduce torque ripple. A SERCOS optical ring provides deterministic command exchange, and the transceiver on this model supports data rates up to 16 MBaud to reduce cycle latency. For resolver-equipped motors, the embedded converter interpolates feedback to 24 bits/rev, allowing tight position loops without an external encoder.

Two ±5 V analog outputs can mirror velocity or torque demand for oscilloscope monitoring, and a differential ±10 V analog input is available for legacy command sources when the network is inactive. The built-in shunt dissipation stage handles regenerative energy continuously up to 800 W and tolerates peaks of 12.8 kW, which helps protect the DC bus during rapid deceleration. A Form C relay rated at 30 VDC @ 1 A can indicate drive-ready status to external control logic. Motor leads may run up to 50 m, the design accommodates phase inductances from 4 mH to 4 H, and differential encoder emulation is available at 16,384 PPR for controllers that require quadrature signals.