Functional Features:​ Provides isochronous or droop mode control; supports forward- or reverse-acting applications; compatible with single or tandem actuators; external speed trim; failed speed signal override; idle/rated ramp; minimum fuel contact.

Application Scenarios:​ Single prime mover operation; two or more prime movers on an isolated bus; base loading against an infinite bus with Automatic Power Transfer and Load (APTL) control, Import/Export control, or process control accessories; parallel operation of multiple prime movers.

Structural Characteristics:​ Sheet-metal chassis with a single printed circuit board. All adjustments accessible from the front panel.

Working Principle:​ The controller processes speed signals from a magnetic pickup and load signals from current/potential transformers, computing the required actuator output to maintain the target speed (isochronous mode) or a load-dependent speed droop. In reverse-acting systems, a complete loss of actuator voltage drives the actuator to full fuel, allowing a backup mechanical ballhead governor to take control.

Installation Requirements:​ Install in a “closed electrical operating area” or enclosed industrial control cabinet. Ensure adequate ventilation for heat dissipation, maintenance clearance, and protection from direct water exposure or condensation. Avoid proximity to high-voltage or high-current equipment that generates electromagnetic interference. Avoid vibration. Must not be installed directly on the engine.

Usage Notes:​ The engine, turbine, or prime mover must be equipped with an independent overspeed shutdown device, separate from the control system. Before disconnecting a battery from systems using an alternator or battery charging device, ensure the charging device is turned off first to prevent control system damage.