The Woodward 505 is a dedicated digital control for industrial steam turbines of all sizes and applications. It provides integrated speed, load, and pressure control with built-in turbine protection, an 8.4-inch color graphical display serving as both operator panel and programming station, and Ethernet/serial communications for plant DCS integration. The 505 is the predecessor to the 505XT and remains widely installed across power generation and petrochemical facilities.
Key Features
Control
- Purpose-built algorithms to start, stop, control, and protect steam turbines and turbo-expanders
- PID-to-PID logic for stable bumpless mode transfers during plant upsets
- Controls speed, load, inlet header pressure, exhaust header pressure, or tie-line power
- Passive or active speed probe inputs
- One or two split-range actuator outputs
- Field programmable via front panel or PC
Protection
- 3 critical speed avoidance bands
- Overspeed anticipation and shutdown protection
- Configurable under- or over-pressure shutdown logic
- Minimum and maximum speed and load settings
Communications
- Ethernet: Modbus TCP and OPC
- Serial: Modbus RS-232/RS-485
- SNTP clock sync to plant DCS
- 8.4-inch (21 cm) graphical display with password security
- Unpluggable terminal blocks for easy installation
Applications
- Industrial steam turbines of all sizes (single-valve)
- Turbo-expanders driving generators, compressors, pumps, or industrial fans
- Power generation and mechanical drive applications
- Steam plant parameter control: speed, load, header pressure, tie-line power
- Predecessor to the 505XT — existing 505 installations are candidates for upgrade
Drake Controls Services
Drake Controls is a Woodward Authorized Distributor and stocks 505 units and parts. Many existing 505 installations are prime candidates for a 505XT upgrade, and Drake’s field service team handles the retrofit engineering, panel design, and commissioning. For units remaining in service, Drake provides repair, overhaul, spare parts, and field support.