Product Description
Woodward 9907-956 is a 505 Series Digital Governor, a microprocessor-based speed controller designed for industrial steam turbines, compatible with single or split-range actuators. It integrates speed regulation, startup/shutdown logic, valve position control, overspeed protection and fault diagnosis. It supports both isochronous and droop control modes for turbine standalone operation and grid-parallel load control. With sulfur-resistant conformal coating, wide temperature tolerance and good vibration resistance, it is widely deployed on steam turbines in power, refining and chemical plants.
Specifications
- Part Number: 9907-956 (505 Digital Governor for Steam Turbine)
- Power Supply: 18–32 Vdc (nominal 24 Vdc)
- Speed Input: Magnetic pickup (MPU), frequency range 0–10 kHz
- Control Modes: Isochronous / Droop speed regulation
- Control Output: Single or split-range output for electro-hydraulic actuators
- Analog Inputs: 4–20 mA, 0–5 V process signals
- Discrete I/O: Digital inputs, relay alarm outputs
- Local HMI: Keypad + LCD for parameter configuration
- Communication: Service port for PC configuration
- Operating Temperature: -40℃ ~ +70℃
- PCB Protection: Sulfur-resistant conformal coating
- Certifications: UL, CE
- Mounting: Panel mount
Application
- Closed-loop speed control for single & multi-stage industrial steam turbines
- Steam turbines driving pumps and blowers in power, refinery and chemical industries
- Turbine startup, ramp-up, synchronization and load control
- Overspeed pre-warning, fault alarm and monitoring interlock
- Waste heat power generation and isolated generator steam turbine control
Series Part Numbers (505 Digital Governor Series)
- 9907-162
- 9907-163
- 9907-164
- 9907-1181
- 9907-1182
- 9907-1183
- 9907-956
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