Woodward 9907-1200 CPC-II High-Precision Current-to-Pressure Electro-Hydraulic Converter

Product Description

The 9907-1200 is a high-reliability industrial-grade current-to-pressure (electro-hydraulic) converter independently developed by Woodward, belonging to the classic CPC-II (Second Generation Current-to-Pressure Converter) product line. As the core precision signal conversion component specially designed for steam turbine governing valve control scenarios that have extremely strict requirements for control accuracy and operation safety, it is widely deployed in heavy-duty industrial scenarios such as thermal power plants, combined-cycle power stations, petrochemical refinery steam turbine units and other safety-critical industrial fields, responsible for accurately converting the 4-20mA DC electronic control signal output from the turbine speed control system into a proportional hydraulic pressure output, to precisely position the single-acting steam turbine governing valve. It effectively solves the industry-wide reliability problem of oil contamination affecting equipment uptime, providing the most fundamental high-reliability signal conversion guarantee for the stable and safe operation of large industrial steam turbine units.

Core Technical Specifications

• Manufacturer: Woodward, original industrial turbine control grade production standard
• Product Category: CPC-II series high-precision current-to-pressure electro-hydraulic converter, official part number 9907-1200
• Physical Parameters: Rugged aluminum alloy housing design, dimensions 155mm × 50mm × 225mm, net weight about 1.2kg, IP67 protection grade, fully compliant with industrial anti-vibration and anti-corrosion standards for turbine control scenarios
• Electrical Parameters: 24V DC industrial power supply, maximum power consumption 15W, with built-in power supply overvoltage and reverse connection protection circuit
• Performance Parameters: 4-20mA DC standard current signal input, conversion accuracy up to ±0.1% full scale, full-range linearity error less than 0.2%, speed loop bandwidth up to 100Hz, maximum allowable working hydraulic pressure 10 bar
• Oil Contamination Resistance: Fully compliant with ISO 20/16 oil contamination resistance standard, can stably operate for a long time in industrial hydraulic oil environments with a certain degree of contamination
• Safety and Certification: Certified by North American hazardous location certification, ATEX, CE, PED and EMC directives, suitable for Class I Division 2 hazardous industrial areas
• Operating Environment: -40°C to +70°C industrial wide temperature working range, 5%-95% non-condensing relative humidity, mean time between failures (MTBF) as high as 100,000 hours

Key Product Functions

• High-Precision Proportional Signal Conversion: The module can accurately convert the 4-20mA control signal output from the upper turbine controller into a proportional hydraulic pressure output, and precisely drive the single-acting steam turbine governing valve to complete the opening adjustment. The full-range linearity is extremely stable, which ensures that the turbine speed and load control accuracy fully meet the design requirements, effectively avoiding the problem of unstable valve control caused by signal conversion deviation.
• Self-Cleaning Anti-Contamination Design: Built-in exclusive self-cleaning valve algorithm and special corrosion-resistant internal flow channel structure, which can automatically clean the tiny impurities in the hydraulic oil during operation, effectively solving the industry-wide reliability problem of oil contamination easily causing the electro-hydraulic converter to block and fail, and the continuous operation time of the equipment is greatly extended.
• Redundant Input and Failsafe Protection Mechanism: The unit supports dual redundant 4-20mA signal input, which can seamlessly switch to the backup signal source when the main control signal is abnormal. The built-in failsafe mechanism can automatically drive the valve to the preset safe position when the power supply is lost or the signal is lost, completely avoiding the major safety accident of the turbine overspeed caused by the failure of the governing valve control.
• Full Health State Monitoring and Diagnosis: The module integrates multiple state monitoring sensors, which can real-timely monitor the health state of the pressure sensor, input demand signal, internal unit operation state and input power quality, and upload the state information to the upper control system through the dedicated software service tool with trend recording function, helping maintenance personnel to quickly locate hidden faults and effectively shorten the system fault recovery time.
• Perfect System Compatibility: The module adopts standard installation and hydraulic connection interface, which can seamlessly connect with the existing Woodward turbine control system, single-acting steam turbine valve servo actuator and hydraulic station, no additional mechanical modification and complex parameter adaptation work is needed, which can be directly used as spare parts for maintenance replacement of old Woodward turbine control systems that have been running for many years, effectively extending the service life of the old industrial turbine control system.

Typical Application Scenarios

• Power generation industry: Thermal power plants, combined-cycle power stations and cogeneration power plant steam turbine governing valve control systems, responsible for the core signal conversion and valve position precision control of the steam turbine unit.
• Oil & gas industry: Refinery steam turbine drive compressor unit control system, offshore platform power system steam turbine control, realizing stable and reliable signal conversion and valve control in the oil field harsh environment.
• Metallurgy industry: Large steel mill waste heat power generation steam turbine unit control system, realizing high-stability operation control of the waste heat recovery steam turbine.
• Industrial drive industry: Large industrial steam turbine drive fan and pump unit control system, realizing efficient energy-saving operation control of the steam turbine.
• Industrial transformation and upgrading projects: Spare parts replacement and system maintenance of old Woodward turbine control systems that have been in operation for many years in various industrial sites.

Frequently Asked Questions