Product Description:

The PC844-XYZ-T is a brushless servo drive produced by Pacific Scientific within the PC800 – PCE800 Brushless Servo Drives series. It converts incoming three-phase energy into controlled current for synchronous motors and provides networked motion control for positioning tables, pick-and-place heads, or packaging machines. By integrating the drive and interface electronics, it eliminates separate amplifiers and enables distributed axes to be addressed directly from the automation controller.

It communicates over the SERCOS Network, allowing deterministic drive commands from the machine PLC. Internally, a three-phase input is rectified onto a 320 VDC bus, then modulated through an IGBT bridge that switches at a ripple frequency of 16 kHz to minimize current ripple. Under continuous load, the drive supplies 7.1 ARMS, delivering 3.0 kW to the motor when it is fed from 240 V AC mains, while transient moves can draw up to 21.2 ARMS. Efficiency of the power stage reaches 98%, so only a small fraction of the energy turns into heat, leaving most of the 12 A rms line current available for mechanical work. The hardware occupies 114 mm of panel width, which is important when multiple axes share the same enclosure.

For dynamic axes that generate regenerative energy, the integral shunt regulator dissipates 800 W continuously and can absorb 12.8 kW during rapid decelerations without rising above its thermal limit. Motor cabling can extend to 50 m without added output filters, provided the selected motor falls within the inductance window bordered by 1 H maximum and 1.25 mH minimum; this keeps current rise times compatible with the IGBT switching pattern. Communication bandwidth scales up to 16 MBaud, supporting high-resolution position loops when several PC800 drives share the optical ring. This allows the power module to be placed farther from the motor while still maintaining torque response and network update rates.