Woodward 8915-111

Digital guide

Product Description: The 8915-111 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 integrated with existing plant control systems via multiple communication protocols.

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Detailed content

Technical Specifications:

Manufacturer: Woodward
Model: 8915-111
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 operation
Local/remote control priority selection
Strong anti-interference ability and stability for different working environments
Relatively low implementation cost for various industrial automation control systems

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 8915-111 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.

Usage Notes:

Read this entire manual and all other publications pertaining to the work to be performed before installing, operating, or servicing this equipment.
Practice all plant and safety instructions and precautions.
Failure to follow instructions can cause personal injury and/or property damage.
Perform configuration and programming only by qualified personnel using OpView™ or 505View software.
Regularly test overspeed protection functionality.
Monitor I/O signal stability and communication integrity.