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Woodward 8904-289
Product Name: Digital Speed Governor / Microprocessor Synchronizer (Woodward 8904-289).
Overview: A 24 Vdc-powered microprocessor-based controller and synchronizer for diesel- or gas-engine-driven generators. It provides speed and load control plus automatic frequency, phase, and voltage matching for paralleling with Woodward or third-party AVRs.
Detailed content
Technical Specifications:
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Power supply: 24 Vdc input
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Rating: Class 1, Division-class industrial rating
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Standard positions: 2
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Serial ports: independent RS-232 and RS-422
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Output: low-current PWM
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Function: microprocessor synchronizer with analog or discrete bias output signals
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Control functions: speed/load setting, MAP limiter, torque limiter, low-speed sensing, remote speed/load reference, soft load transfer, auto idle-to-rated switching, load reject/pulse options, idle droop, adaptive speed-sensing algorithm, data logging
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Optional communication: Modbus® serial
Material & Structure: Industrial control module; PCB-based microprocessor assembly in a panel-mountable housing.
Working Principle: Samples engine speed and generator electrical parameters, computes the required fuel/speed actuator command, and drives the engine governor or actuator while providing bias signals to the AVR for synchronization.
Application Scenarios: Diesel and gas generator sets, marine and industrial power stations, compressor and pump drives, single- and multi-unit paralleling.
Installation Requirements: Mount in a control cabinet with adequate ventilation; run shielded cable for serial links and PWM output; separate power and signal grounds.
Usage Notes: Observe 24 Vdc supply tolerance; ensure RS-232/RS-422 terminations are correct; configure Modbus addressing before network integration.
