Description
Technical Specifications
- Product Model: 9903‑445
- Brand: Woodward
- Warranty: One Year
- Input Voltage: 20‑40 V DC auxiliary power supply
- Operating Temperature: -20 °C to +65 °C
- Storage Temperature: -40 °C to +85 °C
- Response Time: ≤12 ms closed‑loop control response
- Protection Class: IP20 (chassis‑mount, cabinet‑only installation)
- Accuracy Class: Class 0.2 for prime‑mover speed regulation
- Output Frequency: 500‑12000 Hz MPU input frequency range, switch‑selectable
- Rated Current Range: 0‑200 mA actuator drive output
- Communication Interface: Terminal block hard‑wired I/O, analog load‑sharing bus
- Supported Protocols: Analog paralleling bus, no digital fieldbus
- Overload Capacity: 1.3× rated drive current for 30 seconds short‑time withstand
- Dimensions: 272 mm × 208 mm × 74 mm
Product Overview
The Woodward 9903‑445 is a 2301A‑series analog electronic load‑sharing and speed control governor built for reciprocating engine and turbine‑driven generator sets. This chassis‑mounted unit processes magnetic‑pickup speed feedback, outputs drive signals to fuel actuators, and implements load‑balance logic for multi‑genset parallel operation. It addresses common field‑site issues including frequency drift under dynamic load swings, unequal load distribution among paralleled generating units, and unstable governor hunting caused by component aging. Power‑plant commissioning specialists, marine electrical technicians and maintenance teams supporting legacy generation assets derive operational value from this hardware. It supports both isochronous and droop operating modes, includes configurable start‑fuel limiting and acceleration ramping, and serves as a critical drop‑in spare for ageing installations, eliminating the need for full‑control‑system replacement during component failures. It is widely deployed in existing land‑based power plants and marine power‑room assets.
Application Scenarios
- Multi‑Unit Land‑Based Generator Paralleling: Executes speed regulation and real‑power load balancing for parallel‑running diesel and gas‑engine gensets. It stabilises bus frequency during large load‑step changes and prevents individual generators from carrying disproportionate load, avoiding over‑current trips.
- Marine Auxiliary Power Generation Systems: Deployed inside vessel power rooms for parallel‑operated ship‑service generators. It withstands onboard mechanical vibration and supply‑voltage fluctuation to maintain stable electrical bus performance for shipboard consumers.
- Combined Heat‑and‑Power Cogeneration Plants: Provides governor control for engine‑driven CHP assets. It responds rapidly to thermal‑demand‑driven electrical‑load variations and maintains stable operation when paralleled with the utility grid.
- Legacy Power‑Generation Spare‑Part Replacement: Acts as a direct replacement for existing 2301A hardware. Compatible terminal layout minimises cabinet modification work and reduces plant downtime during governor component swap‑out.
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