Woodward 8200-226 Servo Position Control

Product Parameters

• Model Number: 8200-226
• Series: SPC (Servo Position Controller)
• Input Signal: 4-20 mA, 0-200 mA, or ±10 VDC
• Output Drive: Up to 200 mA (suitable for various proportional actuators)
• Feedback Type: LVDT (Linear Variable Differential Transformer) or RVDT
• Power Supply: 18-32 VDC (24 VDC Nominal)
• Communication: RS-232 / RS-485 for configuration
• Enclosure Rating: IP20

Product Description The Woodward 8200-226 is a digital Servo Position Controller (SPC) designed to accurately position steam, gas, or fuel valves and actuators. It serves as a high-speed interface between a plant’s control system and the physical actuator, utilizing advanced closed-loop algorithms to ensure precise positioning based on a demand signal. This specific model is engineered to work with various feedback devices, particularly LVDTs, providing the high resolution and rapid response times required for turbine stability and efficiency. The unit features integrated diagnostics and can be programmed via Woodward’s specialized software to match specific actuator dynamics.

Application Areas This controller is extensively used in the power generation and marine industries. It is primarily applied to control the fuel valves of gas turbines, the governor valves of steam turbines, and large industrial engine actuators where repeatable, high-precision movement is critical for maintaining engine synchronization and grid stability.

Product Specifications

• Weight: 1.10 kg
• Dimensions: 155 mm x 120 mm x 90 mm
• Country of Origin: USA
• Mounting: DIN Rail or Chassis Mount
• 

Operational Precautions

• Ensure the LVDT feedback cables are properly shielded and separated from power cables to prevent signal noise from causing “hunting” or jitter in the actuator.
• Before initial startup, perform the “Null and Span” calibration procedure using the Woodward service tool to align the controller with the physical mechanical stops of the valve.
• Check that the power supply provides sufficient current for the peak demand of the connected servo coil to prevent voltage drops during rapid transients.
• Do not attempt to modify internal jumpers or software setpoints while the turbine is online, as this may lead to an immediate overspeed or shutdown condition.

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