Woodward 8200-508 Digital Valve Positioner Valve Control

Product Overview

The 8200-508 Digital Valve Positioner from Woodward is a high-performance actuator control module engineered for accurate positioning of industrial valves. Designed to operate directly with electric actuators, it integrates motion control, feedback processing, and diagnostics into a single rugged unit suitable for turbine and critical process applications.

The 8200-508 functions as both a digital valve positioner and actuator driver, supporting fast dynamic response, stable closed-loop control, and detailed operational insight across a wide environmental range.

Core Technical Characteristics

The 8200-508 is built for deterministic control and long-term reliability in harsh operating conditions.

Key technical attributes include:

• Nominal supply voltage of 24 VDC with a wide tolerance from 18 to 36 VDC
• Integrated power stage for direct control of electric valve actuators
• Resolver-based position feedback for high-resolution valve angle measurement
• Support for Woodward Limited Angle Torque actuators and brushless DC motors
• IP56 enclosure rating for dust protection and resistance to high-pressure water spray
• Operating temperature range from –40 to +70 °C, with minor derating when Ethernet modules are installed

Control and Communication Capabilities

The 8200-508 incorporates flexible control and communication interfaces to simplify system integration.

Supported interfaces and functions include:

• Ethernet communication using EGD for real-time control system integration
• Analog and PWM command interfaces for legacy or hybrid control architectures
• CANopen connectivity for distributed actuator networks
• Advanced PID control algorithms with adaptive tuning for stable valve positioning
• High-speed internal data logging for event capture and performance analysis

Diagnostics and Serviceability

Designed for operational transparency, the 8200-508 provides extensive built-in diagnostics to reduce commissioning time and simplify maintenance.

Diagnostic functions include:

• Continuous monitoring of actuator position, velocity, and torque demand
• Fault detection for feedback loss, power anomalies, and control loop deviations
• ID module support for automatic actuator parameter recognition and replacement
• Non-intrusive configuration and troubleshooting through communication interfaces

Typical Application Scenarios

The 8200-508 is commonly deployed in systems where precise and repeatable valve motion is essential, including:

• Gas, steam, and hydro turbine control valves
• Fuel gas and air management systems
• Compressor recycle and bypass valve control
• High-duty process valves in power generation and energy infrastructure

​Frequently Asked Questions

Q: What type of feedback does the 8200-508 use for position control?
A: The module uses resolver feedback directly from the actuator, enabling accurate absolute position measurement and robust operation in high-temperature or high-vibration environments.

Q: Can the 8200-508 drive actuators directly without external amplifiers?
A: Yes. The 8200-508 includes an integrated actuator driver stage designed for direct control of compatible Woodward LAT and BLDC actuators.

Q: Is the unit suitable for outdoor or skid-mounted turbine packages?
A: Yes. With an IP56 enclosure rating and wide temperature tolerance, the 8200-508 is well suited for outdoor and enclosed turbine installations.