Digital guide
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Woodward 9905-767
Product Name: Digital Governor / Microprocessor-Based Turbine Controller (505/505E family reference)
Product Introduction: While direct data for 9905-767 is limited, adjacent 9905-series microprocessor controllers (e.g., 9905-768) are high-performance digital microprocessor controller modules designed for the control and monitoring of industrial turbines such as steam turbines, gas turbines, turbo-compressors, and turbine expanders. The 9905-767 follows the same architectural lineage of the 9905-series digital governors.
Detailed content
Technical Specifications (reference based on 9905-series digital governors):
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Display: Menu-driven software with a two-line text LCD (24 characters per line) on the operator control panel
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Processing Speed: 50 MHz
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Program & Data Capacity: 53 MB each
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Operating Voltage: 220 V, 50 Hz output
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Operating Temperature: 0 °C to 60 °C
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Humidity: 60% (non-condensing)
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Construction: Modular structure, control-room installation
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Weight: Approx. 6.5 kg
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Communication: Dual redundant Ethernet communication ports; independent RS-232 and RS-422 serial ports
Functional Features: Controls turbine start, stop, acceleration, and deceleration by operating single or double-stage actuators to drive steam inlet valves for speed control. Provides dual modes: programming mode for internal configuration and running mode for automatic control. Built-in redundant Ethernet communication ports.
Application Scenarios: Speed and load control of industrial steam turbines, gas turbines, utility turbo-generators, and turbo-expanders. Serves petroleum & natural gas, petrochemical, chemical, metallurgy, paper & printing, energy, power transmission & distribution, water treatment, and municipal boiler heating sectors.
Structural Characteristics: Comprised of a series of printed circuit boards housed in an enclosure that safely integrates into a control panel system; modular construction.
Working Principle: The microprocessor-based controller executes programmed logic to manage turbine speed and load. It processes sensor feedback (speed, pressure, temperature) and drives actuators to regulate steam inlet valves, thereby controlling turbine rotational speed and load in both programming and running modes.
Installation Requirements: Install within a control panel in a control-room environment. Ensure ambient temperature stays within 0 °C to 60 °C and humidity below 60% non-condensing. Make proper serial and Ethernet communication connections.
Usage Precautions: Avoid electrostatic discharge (ESD) when handling circuit boards. Do not exceed the specified operating temperature and humidity ranges. Follow lockout/tagout procedures during maintenance.
