PC834-115-N Pacific Scientific
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The Pacific Scientific PC834-115-N is part of the PC800 - PCE800 Brushless Servo Drives series and features a continuous output current of 7.1 ARMS with peak output current up to 21.2 ARMS. This servo drive delivers continuous power of 3.0 kW at 240V three-phase and reaches peak output power of 9.0 kW. It operates with a power stage efficiency of 98% and supports a maximum motor cable length of 50 meters.
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Product Description:
The PC834-115-N is a brushless servo drive built by Pacific Scientific and assigned to the PC800–PCE800 Brushless Servo Drives series. In an automated cell, this device translates low-level motion commands into precise three-phase power, letting a matched permanent-magnet servo motor accelerate, position, and hold loads under closed-loop control. By modulating voltage and current rather than using mechanical gear changes, the drive streamlines speed regulation on conveyors, pick-and-place robots, and indexing tables.
At a sustained rating of 7.1 A RMS, the output stage supplies the continuous phase current required for steady motion. Short-term surges are handled with a peak capability of 21.2 A RMS, giving the axis headroom for rapid acceleration. With forced-air cooling, the continuous value rises to 10.6 A RMS. A DC-link capacitor absorbs up to 40 J of regenerated energy before the shunt circuit engages. Switching occurs at an output ripple frequency of 16 kHz, which reduces torque ripple and keeps acoustic noise above the audible band. Conversion efficiency reaches 98%, so only modest cabinet ventilation is required. The unit accommodates motor inductances from 1.25 mH to 1 H and draws 12 A RMS from a 240 V three-phase supply.
Continuous mechanical power available to the load is 3.0 kW at the rated 240 V supply, while burst demands can be satisfied with a peak output of 9.0 kW. The integrated shunt regulator dissipates 800 W continuously and up to 12.8 kW for brief intervals, but external regeneration duty must remain below 6% to protect the unit from excessive thermal loading. An inrush charging current of 300 A occurs when the bus capacitors energize, so upstream protection must be coordinated with this initial demand. Motor leads may extend to 50 m without exceeding voltage-rise or feedback-noise constraints, allowing the power cabinet to be installed remotely from the motion axis.
