SC722A-001-PM72004 Pacific Scientific
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The Pacific Scientific SC722A-001-PM72004 is a servo controller from the SC720 Command Controllers series. It supports continuous output currents of 3.8 Amps and peak currents up to 7.5 Amps, with a continuous output power of 1.1 kW at 240 Vac three-phase. This controller features ±10 V analog command signal, a 1024 ppr encoder resolution, and weighs 13 pounds.
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Product Description:
Pacific Scientific’s SC722A-001-PM72004 belongs to the SC720 Command Controllers series and is a servo controller for closed-loop industrial automation. Within a motion system, it processes external analog references, applies internal torque and velocity algorithms, and modulates a three-phase bridge so that brushless motors receive the demanded current and speed profiles. This arrangement lets the controller respond to command changes and motor feedback during positioning and speed regulation.
The controller accepts a command range of ±10 V Analog; this differential signal allows a PLC or analog joystick to set drive torque in both rotational directions while minimizing noise pickup. The reference lines see an input impedance of 50 kΩ, so they do not load sensitive sources. Motor switching is performed at 20 kHz, a pulse rate high enough to push audible noise above the human hearing range and reduce current ripple. During continuous duty, the power stage supplies 3.8 A to the motor, corresponding to an output capability of 1.1 kW from a 240 VAC three-phase bus. Position feedback is synthesized by an on-board encoder emulator that outputs 1024 ppr, enabling legacy incremental interfaces even when a resolver is installed. The IGBT output stage, torque and velocity control structure, and 12-bit RDC resolver decoding maintain mechanical accuracy of ±22 arcminutes while the 720 Series personality module remains in the analog configuration.
For short acceleration bursts, the drive can deliver 7.5 A, doubling its thermal steady-state rating, and its peak electrical transfer climbs to 2.2 kW. A current monitor port scales phase amperage to 0.63 V/A, providing a simple oscilloscope check of real-time load. Fault reporting uses a three-bit code line that identifies over-temperature, over-current, or resolver loss. This status output helps the host system distinguish common shutdown causes quickly, and the unit has an overall mass of 13 lbs for panel mounting.
