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Phone: +86 16626708626Description
The Woodward 9907-1228 is a high-performance current-to-pressure converter (CPC-II) specifically engineered for precise positioning of single-acting steam turbine valve servos and other pneumatic actuators used in industrial control systems. This electro-hydraulic converter translates a standard 4-20 mA electronic current input into a proportional pneumatic output pressure ranging typically from 3 to 15 psi (20 to 100 kPa), making it vital for the seamless interface between electronic control systems and pneumatic valve actuators in steam turbine applications.
Designed for durable industrial environments, the 9907-1228 offers high accuracy and repeatability in converting current signals into pressure output, ensuring precise valve positioning critical to turbine performance and system stability. The device supports multiple control modes including position control, speed control, and torque control, allowing flexible adaptation to various turbine servo system requirements. It features zero and span adjustments for calibration, enabling fine-tuning to specific process parameters.
Built robustly for harsh environments, the module is typically panel- or directly mounted with hardware designed for operational longevity. It has an electrical input of 4-20 mA, a supply voltage of 18-32 V DC, and power consumption of around 25 W at steady state. It withstands ambient temperatures from -40°C to +85°C and complies with industrial electromagnetic compatibility standards. Its construction includes ingress protection rated to IP66, making it suitable for demanding industrial conditions involving moisture, dust, and vibration.
- 9907-1228
Key Specifications:
| Parameter | Value |
|---|---|
| Model | 9907-1228 |
| Brand | Woodward |
| Product Type | Current-to-Pressure Converter (CPC-II) |
| Input Signal | 4-20 mA |
| Output Pressure | 3-15 psi (20-100 kPa) adjustable |
| Power Supply | 18-32 V DC |
| Power Consumption | 25 W steady state, 90 W transient |
| Operating Temperature | -40°C to +85°C |
| Ingress Protection | IP66 |
| Control Modes | Position, speed, torque |
| Mounting | Panel or direct equipment mounting |
| Weight | Approx. 25 kg (without oil) |
This model enhances system control by providing rapid and stable pneumatic actuation responses, minimizing valve hysteresis, and improving steam turbine efficiency. Its advanced silt buster function circulates fluid to prevent valve sticking, thereby increasing maintenance interval and reliability.
Related products include Woodward’s other CPC series converters like models 9907-1197 and 9907-1253, which offer different pressure ranges and control features suitable for broader turbine control needs.
Installation requires proper wiring with individually shielded twisted pair cables to prevent noise interference, stable supply pressures within recommended ranges, and secure mechanical mounting. Preventive maintenance includes verifying control signal linearity, inspecting pneumatic connections, and firmware monitoring for optimal performance integrity.
