Description
- The Woodward 9905-867 is a high-precision digital control module designed primarily for the governance of steam turbines, gas turbines, and power generation systems. Part of the renowned 505 series, this controller offers reliable speed and load control, ensuring operational efficiency and system protection through advanced microprocessor technology.
Product Specifications
- Model Number: 9905-867
- Manufacturer: Woodward
- Input Voltage: 18-32 VDC (Standard Industrial Range)
- Operating Temperature: -25°C to +65°C
- Communication Port: RS-232 / RS-485 Modbus Protocol
- Enclosure Rating: IP20 (Typically mounted within a protective NEMA cabinet)
- Display: Integrated 2-line LCD with membrane keypad
- Dimensions: Approximately 243mm x 191mm x 103mm
- Weight: 2.5 kg (5.5 lbs)
- Country of Origin: USA
Application Fields
This module is widely utilized in heavy industrial environments where precise rotational speed management is critical. Key applications include:
- Power plants for generator set synchronization.
- Oil and gas refineries for compressor drive turbines.
- Chemical processing plants for mechanical drive systems.
- Marine propulsion control and auxiliary power systems.
Usage Instructions
The installation of the Woodward 9905-867 should be performed by qualified technicians familiar with turbine safety protocols. To begin, mount the unit in a vibration-free environment and ensure proper grounding to prevent electromagnetic interference. Wire the magnetic pickups (MPUs) for speed sensing and the actuators for steam valve or fuel rack positioning. During initial power-up, use the front-panel keypad to configure PID parameters and overspeed trip levels. For remote monitoring, integrate the unit via the Modbus port to a centralized DCS or PLC system.
Frequently Asked Questions (Q&A)
Q: Can the 9905-867 be programmed while the turbine is running? A: While certain tuning parameters like PID gains can be adjusted during operation, major configuration changes affecting safety logic should only be performed when the turbine is in a stopped state.
Q: What is the primary difference between this and older analog controllers? A: The Woodward 9905-867 provides digital precision, eliminating drift associated with aging capacitors and resistors, and offers comprehensive diagnostic logging that analog units lack.
Q: How do I handle a “Speed Loss” alarm? A: First, check the gap between the MPU and the gear teeth. Ensure the wiring is shielded and not routed near high-voltage cables, as noise can often mimic signal loss.
Related Model Recommendations
- Woodward 9907-164 (505 Digital Control)
- Woodward 9907-162 (Standard 505 Series)
- Woodward 8200-1302 (Peak 150 Controller)
- Woodward 9905-020 (MicroNet Digital Control)
- Woodward 2301A (Load Sharing and Speed Control)
