Woodward 8200-226

The Woodward 8200-226 is a high-performance digital servo position controller, mainly used for closed-loop positioning of servo valves in gas and steam turbines. It receives analog or bus instructions and, in combination with LVDT feedback, achieves high-precision valve position regulation. It is used to control fuel and steam flow, stabilize the rotational speed and load of the unit. The product is equipped with a diagnostic function, supports software tuning and debugging, and is suitable for complex working conditions such as power stations and ship power. Installation should pay attention to shielding grounding and anti-interference, and calibration should be completed before operation. It is widely used in unit renovation and spare parts replacement, and is a key servo drive control unit in the speed regulation systems of steam turbines and gas turbines.

Product Function

1. Receives position commands from the host control system and performs closed-loop servo positioning control for proportional/integral servo valves.

2. Supports single-channel or redundant LVDT position feedback acquisition for real-time valve position monitoring.

3. Allows software-based tuning of PID closed-loop parameters and calibration of zero and span.

4. Features built-in fault self-diagnosis, alarm signal output, and status monitoring capabilities.

5. Compatible with analog signals and DeviceNet bus communication, facilitating integration into unit control systems.

Precautions for Installation and Use

1. Install the unit away from high-power contactors and variable frequency drives (VFDs) within the control cabinet to avoid electromagnetic interference; use shielded cables for LVDT feedback, ensure a reliable single-point ground connection, and route these cables separately from power cables.

2. Use a stable 24VDC power supply with surge protection to prevent control anomalies caused by transient voltage drops.

3. During initial commissioning, use Woodward configuration software to perform zero-point and full-scale calibration, aligning the settings with the valve's mechanical limits.

4. Do not alter internal jumpers without authorization; perform all wiring operations with the power disconnected and observe proper anti-static precautions.

5. Periodically check terminal tightness and shield grounding, and review controller fault logs to prevent prolonged operation with unresolved issues.