Woodward 9905-387 Pro Act Driver Model lll Woodward 9905-387 ProAct Driver Model III is enclosure mounted marine ProAct III electric actuator driver unit, designed for Woodward marine diesel and gas engine governor speed control system, widely fitted onboard cargo vessels, power ships and offshore power platforms for fuel rack actuator position drive and closed-loop position regulation. This marine ProAct III electric actuator driver unit operates on 20–32V DC supply, receives 4-20mA or 0-200mA command signal from governor controller, converts control command into high-current PWM drive output to control ProAct Model III electric actuator, precisely adjusts engine fuel rack position for speed and load control. The marine ProAct III electric actuator driver unit integrates built-in position feedback circuit, overcurrent, overvoltage and stall protection, RS232 service port and CAN communication interface, monitors actuator stroke and detects mechanical jam automatically. Its actuator position drive & hardware diagnostics function continuously monitors DC power supply, command signal loop and actuator feedback integrity, detects signal loss, actuator fault and hardware breakdown, transmits drive fault alerts and actuator position status to vessel AMS alarm console. The actuator position drive & hardware diagnostics guarantees accurate fuel actuator operation for marine engine governor speed control system. It enables reliable marine ProAct driver operation under heavy vessel vibration and salt mist marine environments.

This Woodward 9905-387 ProAct III driver unit delivers stable marine ProAct III electric actuator driver unit performance installed inside engine governor control cabinet. The actuator position drive & hardware diagnostics adopts marine-grade cast alloy enclosure with EMC shielding against electromagnetic interference and mechanical shock. Marine engine technicians rely on marine ProAct driver operation to test actuator stroke response, verify closed-loop positioning accuracy and inspect drive unit during routine maintenance. It adopts wall or enclosure mounting design for straightforward spare replacement and minimal marine engine governor control system downtime. Internal circuit boards use conformal coating to protect electronic components against salt mist, condensation and temperature fluctuation. It works cooperatively with ProAct III electric actuator, Woodward governor controller and ship integrated alarm monitoring system. It is widely used as actuator drive spare hardware for Woodward ProAct marine diesel/gas engine fuel rack governor control system maintenance and retrofit projects.