Product Description:

The SC725B001 command controller is a digital servo controller manufactured by Pacific Scientific within the SC720 Command Controllers series. As a closed-loop torque and velocity regulator, it forms the interface between a three-phase supply and brushless servomotors used in industrial automation cells, packaging lines, and material-handling stations. By converting line power to a controlled DC bus and synthesizing variable-frequency waveforms, the unit supports precise motion profiles for multi-axis machinery. It is intended for systems that need stable speed control and repeatable torque response during changing load conditions.

Incoming power is a 240 VAC three-phase supply, and it feeds an active rectifier that maintains a bus level of 320 VDC. From that bus, the drive can draw a continuous current of 29 Arms and return excess energy through a shunt rated at 200 W continuous and 20 kW peak. The inverter section supplies a continuous output current of 30 A, field-configurable to 40 A, which corresponds to a continuous shaft power of 9 kW. Command inputs accept a ±10 V velocity reference, and the controller can operate in torque or velocity mode. Position feedback comes from a resolver, converted by a 14-bit RDC and a 4096-ppr encoder emulator for compatibility with incremental interface modules.

For transient demands, the inverter delivers a peak output current of 60 A, raising mechanical power to 18 kW during rapid acceleration events. Current is switched at 20 kHz, which helps reduce acoustic noise and motor torque ripple during operation. The analog velocity loop can maintain an overall system accuracy of ±4 arcmin when paired with compatible servomotors. Fault conditions are reported through a 3-bit open-collector port, and the 40-pound metal chassis is intended for control-cabinet installation.