Product Description:

The SC323A031 is a torque/velocity command controller produced by Pacific Scientific within the SC320 Command Controllers series. In an automation cell, this unit sits between the motion drive and the supervisory PLC, issuing analog or digital commands that regulate motor torque or speed while processing resolver feedback for closed-loop control. This arrangement helps the axis maintain stable response as operating demands change during motion.

For power interfacing, the controller accepts an input of 120/240 VAC, and its logic and bus supplies are kept separate to simplify system isolation. The current path is rated for a continuous 7.5 A and can surge to 15 A during acceleration or load transients. A current loop gain of 3.50 A/V links the command voltage to motor current, and the design supports four-quadrant operation, so braking energy is handled by an internal shunt regulator rather than external hardware. Real-time status is presented on a 7-segment display, while the internal function block enforces the torque and velocity profile set by the host controller. Encoder emulation at 1024 PPR supplies position information to downstream devices, and the AC inputs accommodate separate logic and bus feeds to reduce conducted noise.

Feedback is derived from an encoder emulator that converts resolver signals with a precision of ±22 arcmin using a 12-bit RDC, maintaining tight velocity regulation over the full speed range. A removable analog or digital personality module allows selection between command formats without replacing the base unit. The resolver path also feeds the internal encoder emulator so a single feedback element supports both motor commutation and external position reporting. An internal shunt regulator dissipates regenerated power during reverse torque events, and the 7-segment display shows controller state, fault codes, and diagnostic prompts.