Digital guide
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Woodward 8915-988
Product Name (Reference): 505 Series Microprocessor-Based Digital Governor Controller
Product Description: Based on the closest Woodward 505/8915-986 family architecture, this class of controller is a microprocessor-based digital governor specifically designed for speed control and overspeed protection of steam turbines. It adjusts steam inlet flow to precisely control turbine speed and incorporates triple independent overspeed protection logic for rapid shutdown.
Detailed content
Technical Specifications (Referenced from 505/8915-986 family):
- Power Supply: 18–32 VDC, 24 VDC input supported
- Display: Two-line × 24-character LED display
- Enclosure Rating: NEMA 4X or IEC 60529 IP56
- Inputs: 6 programmable current inputs (4–20 mA), 16 discrete contact inputs (4 fixed, 12 programmable)
- 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 to +60 °C (some models -4 to +140 °F)
- Storage Temperature: -40 to +85 °C
- Weight: Approximately 9.11 lbs (4.13 kg)
Core Functions:
- Speed Control: Adjusts steam inlet flow for precise speed regulation; supports single-range or split-range actuators
- Overspeed Protection: Triple independent overspeed protection logic with on-site overspeed test button
- Emergency Shutdown: Dedicated emergency stop for immediate turbine trip
- Sensor Failure Mode: Automatic control mode switching upon sensor failure; local/remote control priority selection
Application Scenarios:
- Steam turbines of various sizes, including industrial steam turbines
- Small grid turbo-generators and turboexpanders
- Single extraction and/or admission turbine applications
Installation & Usage Notes:
- Mount in a NEMA 4X enclosure for harsh industrial environments
- Follow Woodward ESD handling precautions (manual 82715) when servicing printed circuit boards
- An independent overspeed shutdown device totally separate from the prime mover control system is mandatory for personnel and equipment safety
