Description
Technical Specifications
- Product Model: 9903‑445
- Brand: Woodward
- Warranty: One Year
- Input Voltage: 18‑40 V DC auxiliary power supply
- Operating Temperature: -20 °C to +65 °C
- Storage Temperature: -40 °C to +85 °C
- Response Time: ≤15 ms control‑loop response
- Protection Class: IP20 (chassis‑mount, cabinet‑installation only)
- Accuracy Class: Class 0.2 for speed regulation
- Output Frequency: 0‑3000 Hz magnetic‑pickup signal support
- Rated Current Range: 0‑200 mA actuator drive output
- Communication Interface: Hard‑wired terminal block, local test port
- Supported Protocols: Analog paralleling bus, local service interface
- Overload Capacity: 1.3× rated drive current for 30 seconds short‑time withstand
- Dimensions: 275 mm × 210 mm × 75 mm
Product Overview
The Woodward 9903‑445 is a legacy 2301A‑series electronic speed and load‑sharing control unit for diesel‑, gas‑engine and turbine‑driven generator sets. This chassis‑mount analog governor executes closed‑loop speed regulation and proportional load distribution for multiple gensets running in parallel. It addresses typical field‑site pain points including unstable frequency under fluctuating load, uneven load distribution among paralleled generator units, and speed drift caused by component aging. Power‑plant technicians, marine‑automation engineers and maintenance teams for legacy generation assets benefit from this hardware. It supports both isochronous and droop operating modes, stabilizes bus frequency during load transients, and prevents generator overloading caused by load‑sharing imbalance. Widely deployed in older installations, this unit serves as a critical spare for existing plants, avoiding costly full‑system replacement during component failure.
Application Scenarios
- Land‑based Multi‑Unit Generator Paralleling Plants: Governs prime‑mover speed and balances real power output for parallel‑running diesel or gas gensets. It maintains stable bus frequency during large load steps and prevents individual generators from taking disproportionate share of system load.
- Marine On‑board Power Generation Systems: Used within ship power rooms for parallel‑operated auxiliary generator sets. It tolerates vessel‑board vibration and voltage‑supply variation, delivering consistent speed regulation for ship‑service electrical networks.
- Combined Heat‑and‑Power Cogeneration Facilities: Provides governor control for engine‑driven CHP generator assets. It reacts rapidly to thermal‑demand‑driven electrical‑load changes and preserves stable parallel‑operation with onsite or utility‑grid connections.
- Legacy Generation Asset Retrofit & Spare Replacement: Functions as drop‑in spare for existing 2301A control hardware. Matching terminal layout reduces cabinet modification work and shortens plant‑downtime during control‑board replacement.
Reviews
There are no reviews yet.