PC844-XYZ-A Pacific Scientific
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The Pacific Scientific PC844-XYZ-A is a servo drive from the PC800 - PCE800 Brushless Servo Drives series with a continuous output current of 7.1 Amps RMS and a power stage efficiency of 98 percent. This drive supports a SERCOS network command interface and can deliver up to 3.0 kilowatts of continuous power at 240V AC three-phase. It weighs 2.6 kilograms and features an encoder output resolution of 16,384 pulses per revolution.
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Product Description:
The PC844-XYZ-A is a brushless servo drive manufactured by Pacific Scientific within the PC800–PCE800 Brushless Servo Drives series. The unit interfaces between a motion controller and a synchronous servomotor, shaping three-phase power into high-bandwidth current loops so industrial axes can follow commanded profiles accurately. It supports distributed topologies where space, response time, and deterministic communications are critical to packaging, printing, and electronic assembly equipment. By performing this conversion inside a compact, panel-mounted package, the drive simplifies wiring and streamlines machine diagnostics.
Its command interface is the SERCOS Network, and data are refreshed at a SERCOS communication rate of 16 kHz, allowing the velocity loop to close at 400 Hz for tight tracking of dynamic position changes. Under continuous load, the drive delivers 7.1 A RMS to the motor, while a five-second surge capacity of 21.2 A RMS handles acceleration or shock events without saturating the power stage. The converter sustains 3.0 kW of mechanical output from a 240 VAC three-phase supply and retains a power-stage efficiency of 98%, which helps minimize cabinet heat. Internal switching operates at an output ripple frequency of 16 kHz, so current distortion at the motor terminals remains low, and the drive requires a minimum motor inductance of 1.25 mH. Despite these ratings, the housing measures only 198.1 × 114 × 158 mm and weighs 2.6 kg, which helps when retrofitting confined enclosures. An incremental encoder pass-through provides 16,384 PPR feedback to external controllers.
Energy produced during regenerative braking is diverted to an internal resistor that dissipates 800 W continuously and up to 12.8 kW in short bursts, preventing DC-bus overvoltage when vertical or high-inertia axes decelerate. The mains side draws 12 A from a 240 VAC three-phase source, allowing use with standard machine supply breakers without oversizing. Installation flexibility is supported by a maximum motor cable reach of 50 m, so the drive can remain in a protected panel while the servomotor is mounted on moving or distant machine elements.
Frequently Asked Questions about PC844-XYZ-A:
Q: What command interface does the PC844-XYZ-A brushless servo drive use?
A: This drive uses a SERCOS Network for its command interface.
Q: What is the continuous output current rating of the PC844-XYZ-A?
A: The continuous output current for this model is 7.1 A RMS.
Q: What is the maximum supported motor cable length for the PC844-XYZ-A?
A: The PC844-XYZ-A supports a maximum motor cable length of 50 meters.
Q: What encoder output resolution does the PC844-XYZ-A offer?
A: This model provides an encoder output resolution of 16,384 PPR.
Q: What is the power stage efficiency of the PC844-XYZ-A servo drive?
A: The power stage efficiency of this drive is rated at 98%.
