PC844-XYZ-N
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The PC844-XYZ-N is an all-digital brushless servo drive with a peak output current of 21.2A RMS. Manufactured by Pacific Scientific, it belongs to the PC800 - PCE800 Brushless Servo Drives series, featuring SERCOS Network command interface. It supports input voltages from 323VAC to 528VAC (3-Phase).
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Product Description:
The PC844-XYZ-N is a servo drive from the PC800 series, manufactured by Pacific Scientific for motion control applications. Its interfaces include RS-232 and RS-485 communication ports. This drive provides 16 bites of resolution for position control and functions over a motor power cable length of up to 50 m.
The PC844-XYZ-N drive supports ±10 VDC analog input for command signals and it provides step as well as directional inputs for incremental control. It provides a peak output current of 21.2 Arms for up to 5 seconds and its continuous output current capacity is 10.6 Arms. The drive’s power stage operates at 98% efficiency and supports a peak output power of 9.0 kW. It integrates a shunt regulator with 12.8 kW peak capacity for 500 ms and its continuous power rating of the shunt regulator is 800 W. Its bus capacitance can absorb 40 joules of energy from a 320 V DC and it is designed to operate within an input voltage range of 180 to 265 VAC from a three-phase supply. The PC844 drive’s recommended fuse rating is 30 A/250 V Slo-Blo type and it maintains ambient thermal range through forced air cooling.
The PC844-XYZ-N drive offers motor current using a pseudo sine waveform that matches back EMF for precise torque control and its motor control bandwidth reaches up to 1.5 kHz, while its recommended operational bandwidth is 1.0 kHz. It supports motor electrical frequencies under 400 Hz and its velocity command resolution is less than 0.001 RPM. The velocity loop updates every 250 microseconds and the position loop update period is 1 millisecond. The PC844 drive measures 198.1 mm h x 114 mm w x 158 d and possess an overall weight of 2.6 kg.
Frequently Asked Questions about PC844-XYZ-N:
Q: Why does the PC844-XYZ-N use a pseudo sine waveform for motor current control?
A: The pseudo sine waveform helps match the back EMF, ensuring precise torque control, which is crucial for applications requiring high accuracy. The PC844-XYZ-N provides superior motor performance with this feature.
Q: What is the significance of the 1.5 kHz motor control bandwidth in the PC844-XYZ-N?
A: The 1.5 kHz bandwidth allows the drive to respond quickly to dynamic changes in load, providing faster and more precise motion control.
Q: How does the 12.8 kW peak capacity of the shunt regulator in the PC844-XYZ-N improve performance?
A: The 12.8 kW peak shunt regulator helps absorb excess energy, stabilizing the system during high power demands. This feature enhances overall system safety and efficiency in the PC844-XYZ-N.
Q: Why is the velocity loop update rate of 250 microseconds critical for the PC844-XYZ-N?
A: A rapid velocity loop update rate enables real-time adjustments to motor speed, providing smoother motion control with minimal lag. This makes the PC844-XYZ-N ideal for fast, precision applications.
Q: What role does the RS-232 and RS-485 communication interface play in the PC844-XYZ-N drive?
A: The RS-232 and RS-485 interfaces allow flexible communication with controllers and other devices, ensuring seamless integration in various systems. This makes the PC844-XYZ-N suitable for complex industrial setups.
