Description
Woodward 8559-850
Technical Specifications:
- Brand: Woodward
- Model: 8559-850
- Input Signal: DeviceNet or 4-20mA
- Output Type: Closed-loop current drive
Functional Features:
- High-Precision Closed Loop: Built-in LVDT signal conditioning circuit achieves closed-loop precise valve position control.
- High Redundancy: Meets stringent safety and responsiveness requirements for turbine fuel control.
- Flexible Configuration: Supports various servo valve types and feedback signal formats.
Application Scenarios:
Precise position servo control for fuel control valves, main stop valves, and control valves in steam or gas turbines.
Performance Parameters:
- Position Resolution: 0.1% F.S.
- Drive Current: Maximum ±40mA
- Response Bandwidth: > 50Hz
Material Composition:
Industrial-grade electronic components housed in a fully sealed metal enclosure.
Structural Features:
Standard DIN rail or panel cutout mounting. Features comprehensive status indicator LEDs and test terminals.
Working Principle:
Compares the target position command with the actual LVDT feedback position. An internal PI regulator calculates the required drive current to eliminate errors caused by system dead zones and friction.
Installation Requirements:
Install as close to the servo valve as possible to shorten feedback cables. Ensure proper grounding.
Usage Precautions:
Never apply full-scale output without a connected servo valve. Always perform mechanical zero alignment before electrical calibration during commissioning.
