PC834-107-N by Pacific Scientific

The PC834-107-N is a brushless servo drive produced by Pacific Scientific for the PC800-PCE800 Brushless Servo Drives series. In an automation cell, this unit converts three-phase mains power into controlled current and voltage for a matched permanent-magnet motor, allowing closed-loop speed or position control without mechanical throttling. Its design supports multi-axis motion platforms, pick-and-place gantries, and other equipment where responsive torque and compact cabinet space are priorities.

This drive accepts a 240 VAC three-phase supply and delivers a continuous power output of 3.0 kW while supplying up to 7.1 A RMS of output current to the motor. During steady operation, the input draws 12 A, making the drive suitable for panels with limited feeder capacity. Command paths include RS-232 and RS-485 serial links, a ±10 V analog channel, step-and-direction pulses, and onboard indexing, so the unit can follow legacy or modern controllers without additional converters. Internal pulse-width modulation operates at 16 kHz; the high switching rate suppresses audible noise and keeps torque ripple low. A power-stage efficiency of 98% limits heat buildup. The 320 V DC bus stores 40 J to support operation through brief mains voltage dips.

When acceleration demand rises, the drive can deliver a peak power output of 9.0 kW and a momentary current of 21.2 A RMS. It supports motor inductances ranging from 1.25 mH to 1 H, allowing it to operate with high-torque or high-speed windings without causing current foldback. Regenerative operation is limited to a 6% duty cycle. Excess regenerative energy is routed to a shunt that absorbs 800 W continuously or 12.8 kW during short bursts. Observing these operating limits helps the drive maintain a stable DC-link voltage and prevents regenerative energy from overloading the upstream electrical system.