Digital guide
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Woodward 9905-603
Product Overview
A multifunctional digital controller for three-phase AC generators, integrating automatic synchronization, real kW load sharing, and VAR/PF control into a single unit. The 9905-603 (a replacement for 9905-712) features a Wye PT configuration and a 1–5 VDC speed bias output, making it ideal for paralleling multiple generators in industrial and commercial power systems.
Detailed content
Technical Specifications
- System Compatibility: Three-phase AC generators (Wye PT configuration)
- Speed Bias Output: 1–5 VDC analog signal for frequency trimming
- Load Sharing Accuracy: ±0.5% of full load for real kW distribution
- Synchronization Accuracy: ±0.5 Hz frequency difference, ±5° phase angle
- Power Supply: 18–32 VDC, 8 W maximum
- Operating Temperature: -40 °C to +70 °C
- Dimensions: 461 mm × 265 mm × 59 mm
- Weight: Approximately 3.2 kg
Functional Characteristics
- Fully automatic synchronization for dead-bus and live-bus paralleling
- Isochronous or droop load sharing modes for stable parallel operation
- Integrated reverse power protection to prevent generator motoring
- User-programmable logic for custom start/stop and protection sequences
- LED status indicators for power, sync, load, and fault conditions
- RS-232 communication port for configuration and monitoring
Application Scenarios
Multi-generator industrial power plants, commercial building emergency power systems, marine vessel power distribution, microgrid control, and oil/gas field standalone power systems.
