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Woodward 8915-055
Product Name: 505 Series Digital Governor (part number 8915-055)
Product Overview: The 8915-055 is a microprocessor-based digital governor controller from Woodward’s 505 product family. While specific standalone details for 8915-055 require reference to official Woodward documentation, based on the 505 series architecture (exemplified by the closely related 8915-955 model), it is designed for speed control and protection of steam turbines and other rotating equipment.
Detailed content
Technical Specifications: Based on the 505 series architecture:
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Power supply: 24 Vdc input
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Rating: Class 1, Div
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Operator interface: two-line × 24-character LED display with 30-key multifunction keypad
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Communication: independent RS-232, RS-422, and RS-485 hardware interfaces; built-in redundant Ethernet; optional Modbus®
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Inputs: 6 programmable current inputs, 16 discrete contact inputs
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Outputs: 2 actuator outputs, 8 relay outputs, 6 programmable current outputs
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Enclosure: NEMA 4X or IEC 60529 IP56 rated
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Operating temperature: –20 to +60 °C
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Weight: approx. 4.13 kg (9.11 lb)
Functional Features:
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Precise speed control by adjusting steam inlet flow
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Supports single-range or split-range actuators
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Multiple independent overspeed protection logic for rapid shutdown
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Emergency stop capability
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Automatic control mode switching upon sensor failure
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Local/remote control priority selection
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Multi-dynamic control: speed PID, cascade control, auxiliary control, valve limiter
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Adaptive speed sensing algorithm
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Two independent serial ports with data logging capability
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Menu-driven software for on-site programming
Application Scenarios:
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Steam turbine speed and load control
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Industrial gas turbines
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Diesel and gas engine driven generators
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Compressors and turboexpanders
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Aircraft derivative turbines
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Dual-fuel steam turbines
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Power generation control systems
Working Principle: The microprocessor-based controller receives speed feedback and compares it against the setpoint. The control algorithm computes the appropriate actuator drive signal to regulate steam inlet valves. Multiple protective functions (overspeed trip, emergency shutdown, sensor failure detection) ensure safe turbine operation. Communication interfaces enable integration with DCS/PLC systems for remote monitoring and control.
Installation Requirements: Install per Woodward 505 series guidelines. Provide stable 24 Vdc power supply. Properly shield and ground serial communication cables. Ensure enclosure environmental rating (NEMA 4X/IP56) is maintained. Operating temperature must be kept within –20 to +60 °C.
Usage Notes: Perform valve/actuator calibration before commissioning. Verify overspeed protection periodically using the overspeed test function. Configure control dynamics with appropriate margins. Use Woodward’s 505View or OpView™ software for configuration and diagnostics.
