Product Description:

The PC844-001-T is a brushless servo drive built by Pacific Scientific in the PC800-PCE800 Brushless Servo Drives series. It is intended to regulate torque, speed, and position of compatible permanent-magnet motors in multi-axis industrial automation where deterministic network control is required. Through a SERCOS fiber-optic node, the unit exchanges real-time motion commands and feedback with higher-level controllers while its internal power stage converts DC-bus energy into three-phase PWM output for the motor.

The power section operates from a bus of 320 VDC and can deliver a continuous phase current of 7.1 A RMS; during acceleration it supplies up to 21.2 A RMS for short intervals. Pulse-width modulation is generated at 16 kHz, a high switching frequency that reduces audible noise and current ripple in the motor windings. Conversion losses remain minimal, as the power stage reaches 98% efficiency, which limits heat generation and simplifies cabinet cooling design. Mechanical dimensions of 198.1 mm in height, 114 mm in width, and 158 mm in depth allow dense panel layouts, and the 2.6 kg mass eases handling during installation.

The drive sustains a shaft output of 3.0 kW from a 240 VAC three-phase supply while drawing 12 A RMS from the mains, indicating a favorable input-to-output ratio. Position regulation is aided by a velocity loop that refreshes every 250 microseconds, giving tight speed control even when the connected motor exhibits inductances up to 1 H. For motors with lower inductance values, such as the 1.25 mH minimum specified, loop stability can be maintained by adjusting the SERCOS-transferred gain parameters without altering the hardware. The compact form factor suits packaging lines, electronic assembly stations, and other applications where rapid, precise motion must coexist with limited cabinet space.