Product Description:

Pacific Scientific’s SC725B001-01 belongs to the SC720 Command Controllers series and functions as a servo controller that adjusts torque and velocity loops for brushless motor axes in automated machinery. By coordinating drive current and feedback signals, the unit links motion commands from a PLC with the mechanical load for precise positioning in multi-axis cells. It is intended for applications that require controlled motion, stable feedback processing, and direct integration with automated equipment.

The controller is powered from a 240 Vac three-phase bus and can deliver a continuous output of 30 A. Transient moves are supported by a peak capability of 60 A, while the power stage supplies 9 kW continuously or 18 kW for short bursts during acceleration. Four-quadrant operation allows motoring and regenerative braking in both directions, and the internal single-phase logic supply isolates the control electronics from the power bus. Pulse-width modulation runs at 20 kHz to reduce audible noise and improve current ripple, while the differential line driver returns incremental encoder signals to the drive. A torque and velocity control structure maintains system accuracy to within ±4 arcmin when the resolver interface or encoder emulator closes the feedback loop.

For position feedback, the drive supports an encoder resolution of 4096 ppr and accepts shaft speeds up to 3000 rpm before the differential receiver saturates. Resolver-to-digital conversion yields a 14-bit angle word, and a 3-bit open-collector fault bus reports overtemperature, current limit, or position loss to the cell controller. The seven-segment display shows status codes for local status indication, and the unit weighs 40 lbs for standard cabinet mounting. A single-phase control logic input, four-quadrant energy flow, and an encoder emulator option are also included in the controller design.