Digital guide
You are here:
Woodward 8915-978
Product Name: 505 Series Microprocessor-Based Digital Governor / Speed Control Module
Overview: A microprocessor-based digital governor controller from Woodward’s classic 505 series, primarily designed for speed control and overspeed protection of steam turbines. It is suitable for single-valve steam turbines, single extraction/admission configurations, and split-range actuator arrangements.
Detailed content
Specifications:
- Power Supply: 18–32 VDC (24 VDC supported)
- Display: Two-line × 24-character LED
- Enclosure: NEMA 4X / IEC 60529 IP56
- Inputs: 6 programmable current inputs; 16 discrete contact inputs
- Outputs: 2 actuator outputs; 8 relay outputs; 6 programmable current outputs
- Communication: RS-232, RS-422, RS-485
- Software: OpView™ and 505View
- Operating Temperature: –20 to +60 °C (–4 to +140 °F)
- Storage Temperature: –40 to +85 °C (–40 to +185 °F)
- Dimensions: Approx. 14 × 11 × 4 in (35.6 × 27.9 × 10.2 cm)
- Weight: Approx. 9.11 lb (4.13 kg)
Features: Precise speed control via steam inlet flow adjustment; triple independent overspeed protection logic; overspeed test button; emergency stop button; automatic control-mode switching on sensor failure; local/remote control priority selection; support for single-range or split-range actuators; 30-key multifunction keypad; compatibility with DCS and PLC systems via multiple communication protocols.
Applications: Speed control and protection for industrial steam turbines; small grid-connected turbo-generators; turboexpanders; turbine-driven compressors and pumps; chemical and refinery process turbine operations.
Structure: Front-panel Operator Control Panel (OCP) with LCD and multifunction keypad; microprocessor-based architecture; rich I/O interface suite for system expansion.
Working Principle: The microprocessor executes high-precision algorithms to implement complex control logic such as critical speed avoidance and valve limiting. By adjusting the steam inlet flow through the actuator, turbine speed is precisely controlled. Triple independent overspeed protection logic ensures rapid shutdown when overspeed occurs.
Installation & Precautions: Install in a location meeting NEMA 4X / IP56 environmental protection requirements. Commission and adjust parameters on-site through the integrated operator control panel. Ensure proper integration with the host DCS/PLC via RS-232/422/485. Perform regular overspeed tests using the dedicated test button to verify protection functionality.
