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Woodward 8915-1146

Product Description:​ The 8915-1146 is a microprocessor-based digital governor controller produced by Woodward, belonging to its classic 505 series. It is primarily designed for speed control and protection of steam turbines. The controller adjusts steam inlet flow to precisely control turbine speed, supporting single-range or split-range actuators to accommodate turbines of different sizes. It incorporates comprehensive protection and diagnostic capabilities, and can be smoothly integrated with the existing control system of the factory via multiple communication protocols. The unit delivers stable performance and high reliability for critical turbine control applications.

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Detailed content

Technical Specifications:
  • Manufacturer: Woodward
  • Model: 8915-1146
  • Series: 505 Series Digital Governor
  • Type: Microprocessor-based controller
  • Power Supply: 18–32 VDC, supporting 24 VDC input
  • Display: Two-line × 24-character LED display
  • Enclosure Rating: NEMA 4X or IEC 60529 IP56
  • Inputs: 6 programmable current inputs; 16 discrete contact inputs
  • Outputs: 2 actuator outputs; 8 relay outputs; 6 programmable current outputs
  • Communication Interfaces: RS-232, RS-422, RS-485
  • Software: OpView™ and 505View for configuration, monitoring, and diagnostics
  • Operating Temperature: -20°C to +60°C (-4°F to +140°F)
  • Storage Temperature: -40°C to +85°C (-40°F to +185°F)
  • Weight: Approximately 4.13 kg (9.11 lbs)
Key Features:
  • Precise speed control by adjusting steam inlet flow
  • Supports single-range or split-range actuators for turbines of different sizes
  • Triple independent overspeed protection logic for rapid shutdown on overspeed
  • Overspeed test button for convenient on-site testing of protection functions
  • Emergency stop button for immediate shutdown in emergencies
  • Automatic control mode switching on sensor failure to ensure uninterrupted system operation
  • Local/remote control priority selection
  • High reliability with microprocessor-based design for precise control and stability
  • Multiple communication interfaces for easy integration with host computers or other devices
Application Scenarios:
  • Speed control and protection for steam turbines of various sizes
  • Industrial steam turbines
  • Small grid turbo-generators
  • Turboexpanders
  • Single extraction and/or admission applications
  • On-site programming and parameter adjustment via integrated operator control panel
Structural Characteristics:
  • Microprocessor-based design housed in NEMA 4X / IP56 enclosure
  • Integrated operator control panel with two-line, 24-character LED display
  • Modular internal construction with multiple PCBs
Working Principle:​ The 8915-1146 receives speed feedback from magnetic pickups or other speed sensors and process signals through its programmable inputs. The microprocessor executes the control algorithm, comparing actual turbine speed to the setpoint. It generates control outputs to drive the steam inlet valve actuator(s), adjusting them to maintain the desired speed. The triple independent overspeed protection logic continuously monitors speed and triggers rapid shutdown on overspeed conditions. Communication interfaces (RS-232/RS-422/RS-485) enable integration with host computers, DCS, or PLC systems for monitoring and control.
Installation Requirements:
  • Mount in control panel per NEMA 4X / IP56 enclosure specifications.
  • Provide 18–32 VDC power supply (24 VDC nominal).
  • Connect speed sensors with proper shielding and grounding.
  • Wire actuator outputs, relay outputs, and programmable I/O per the wiring diagram.
  • Connect communication ports using shielded cable with proper termination and grounding.
  • Ensure ambient temperature remains within -20°C to +60°C.

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