WOODWARD 9907-149 ProTech 203 Overspeed Trip Protection Unit

🔨The Woodward 9907-149 is a 505E Digital Governor for single-extraction and/or admission steam turbines. It provides speed and extraction-pressure control with dedicated start, stop, control, and protection algorithms for steam turbines or turboexpanders driving generators, compressors, pumps, and industrial fans. Its PID-based control structure manages critical steam-plant parameters such as turbine speed and extraction/admission pressure, making it a standard control and spare module for installed Woodward 505E governor systems.

🔶Key Specifications

• Manufacturer: Woodward
• Model / Part Number: 9907-149
• Product Series: 505E Digital Governor for Extraction Steam Turbines
• Product Type: Digital turbine governor / control module
• Control Function: Start, stop, speed control, extraction/admission pressure control, and turbine protection
• Applicable Turbines: Single-extraction and/or admission steam turbines and turboexpanders (driving generators, compressors, pumps, fans)
• Power Supply: 24 V DC nominal (dual redundant, 18–32 V DC range)
• Communication: Modbus RTU over RS-232 / RS-422 / RS-485 (dual ports)
• I/O: Multi-channel analog inputs/outputs, digital I/O, and relay outputs per 505E configuration

🔶Key Features

• Extraction/Admission Control: Dedicated algorithms control both turbine speed and extraction/admission steam pressure with a unique PID structure.
• Single-Range Control Versatility: Suited to steam turbines and turboexpanders of various sizes driving generators, compressors, pumps, and fans.
• Integrated Start/Stop Sequence: Handles hot and cold starts and coordinated shutdown sequences.
• Redundant Power Input: Dual-redundant 24 V DC power for increased availability.
• Field Communications: Modbus RTU on dual serial ports enables remote set-point adjustment, configuration, and monitoring.

🔶Typical Applications

• Extraction/admission steam turbine governing in cogeneration and power plants
• Turboexpander and turbine-driven compressor/pump control
• Spare-part supply for installed Woodward 505E governor systems