PC843-001-A Pacific Scientific
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The Pacific Scientific PC843-001-A is a brushless servo drive from the PC800 - PCE800 Brushless Servo Drives series. It has a bus voltage of 320 VDC and continuous output power of 1.5 kW with an output current of 3.6 ARMS. The drive supports a SERCOS Network command interface and achieves a power stage efficiency of 98%.
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Product Description:
The PC843-001-A servo drive is produced by Pacific Scientific within the PC800-PCE800 Brushless Servo Drives series. It is designed to supply regulated power to brushless AC motors in automated machinery, translating high-level motion commands from a central controller into precise phase currents. By combining power conversion, feedback processing, and network communication in a compact frame, the unit serves as the link between the plant control system and the mechanical axis. This arrangement allows the drive to manage commutation and closed-loop response directly at the axis.
Inside the power stage, a DC bus of 320 VDC is synthesized from a 240 V three-phase supply and routed through low-loss IGBTs. Motion commands enter through the SERCOS Network interface, allowing deterministic real-time control. Under nominal load, the drive supports motor applications up to 1.5 kW and supplies 3.6 ARMS to the motor, while the power stage achieves an efficiency of 98%. The housing measures 88.1 mm in width, 198.1 mm in height, and 158 mm in depth, keeping the heat sink and electronics within a compact enclosure. The incoming line draws 6 A rms at full output, and the filter design supports motor inductances down to 2.0 mH without compromising current-loop stability.
For dynamic peaks such as acceleration or sudden load changes, the inverter can supply 10.6 ARMS for up to several seconds, while its instantaneous crest capability reaches 15 A peak. A carrier frequency of 20 kHz keeps ripple torque low and moves switching noise beyond the audible range. Excess regenerative energy is absorbed by the internal shunt circuit, which is rated for 12.8 kW of short-term power and helps protect the shared DC bus. This shunt path dissipates returned energy during braking rather than forcing it back onto the supply. The current regulators remain stable with motor inductances up to 2 H, and the drive supports cable runs to the feedback-equipped motor of up to 50 m without exceeding voltage-drop limits or disrupting SERCOS timing.
Frequently Asked Questions about PC843-001-A:
Q: What is the required bus voltage for the PC843-001-A servo drive when using a 240V 3-phase supply?
A: The PC843-001-A operates with a bus voltage of 320 VDC when supplied by a 240V 3-phase input.
Q: What is the continuous output power rating of the PC843-001-A?
A: This model delivers a continuous output power of 1.5 kW on a 240V 3-phase input.
Q: Which command interface does the PC843-001-A utilize for communication?
A: The PC843-001-A supports communication via a SERCOS Network command interface.
Q: What is the maximum motor cable length supported by the PC843-001-A?
A: The maximum length for the motor cable on this servo drive is 50 meters.
Q: What is the peak output current capability of the PC843-001-A servo drive?
A: This drive offers a peak output current of 10.6 ARMS.
