PC844-001-F Pacific Scientific
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The Pacific Scientific PC844-001-F is part of the PC800 - PCE800 Brushless Servo Drives series. This servo drive offers a continuous current of 7.1 ARMS and a peak current of 21.2 ARMS, with a max current bandwidth of 1.5 kHz. It provides a continuous output power of 3.0 kW at 240 V AC 3-phase, uses a SERCOS network command interface, and features six opto inputs and three opto outputs.
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Product Description:
The PC844-001-F is a brushless servo drive produced by Pacific Scientific within the PC800–PCE800 Brushless Servo Drives series. It regulates torque, speed, and position for matched servomotors in industrial automation, acting as the power interface between a SERCOS motion controller and the motor windings. By converting three-phase mains power to a controlled DC bus and high-frequency PWM output, the unit delivers accurate current waveforms that let axes accelerate, decelerate, and maintain static loads with repeatable precision on assembly lines, packaging machines, and material-handling equipment. Closed-loop operation helps the axis respond consistently during positioning moves and steady-speed operation.
The drive sustains a continuous phase current of 7.1 ARMS, supporting up to 3.0 kW of mechanical power from a 240 VAC three-phase supply. During capacitor charging, an inrush of 300 A occurs, so upstream protection must tolerate that 2.0 ms surge. Internal rectification develops a nominal bus of 320 VDC, which feeds a PWM stage switching at an output-ripple frequency of 16 kHz. Current regulation has a maximum bandwidth of 1.5 kHz, provided the connected motor has at least 1.25 mH of inductance. Under rated output, the RMS line demand is 12 A, and motion commands arrive exclusively through the fiber-optic SERCOS network.
A velocity loop bandwidth of 400 Hz enables quick correction of speed errors during indexing. For auxiliary electronics, the controller sources 80 mA at 24 V and 250 mA at 5 V, while six opto-isolated inputs and three opto-isolated outputs provide discrete signaling to plant PLCs. The discrete I/O can support interlocks and status exchange with surrounding machine controls. Dynamic events are covered by a peak phase current of 21.2 ARMS, giving temporary headroom beyond the continuous rating without excessive heating. Meeting the minimum inductance requirement keeps current ripple within limits as the drive operates near its upper control bandwidth.
Frequently Asked Questions about PC844-001-F:
Q: What command interface does the PC844-001-F servo drive use?
A: The PC844-001-F drive uses a SERCOS Network as its command interface.
Q: What is the continuous output current capability of the PC844-001-F?
A: This drive provides a continuous output current of 7.1 ARMS for sustained operation.
Q: What is the peak current rating for the PC844-001-F drive?
A: The peak current available on the PC844-001-F is 21.2 ARMS, supporting short-term load demands.
Q: What is the nominal bus voltage for the PC844-001-F from Pacific Scientific?
A: The PC844-001-F has a nominal bus voltage of 320 VDC for standard operation.
Q: What is the velocity loop bandwidth for the PC844-001-F drive?
A: The velocity loop bandwidth of the PC844-001-F is specified at 400 Hz, allowing for responsive speed control.
