Woodward CPC-II 9907-1200 Electro Hydraulic Converter

Woodward CPC-II 9907-1200 Electro Hydraulic Converter (Current Pressure Converter I/P)

1、 Complete definition of model
CPC-II=Current to Pressure Converter Gen2 second-generation high-precision electro-hydraulic conversion unit
Part number: 9907-1200
Output oil pressure range: 0-10 bar (145 psi)
Explosion proof certification: Suitable for ATEX Zone 2 hazardous areas
Structure: Single channel standard type (non redundant)
Supporting system: Woodward 505/505E, TG, ProTech turbine speed control system, driving single acting hydraulic motor/regulating valve servo actuator
2、 Core working principle
Receive 4-20mA standard current command output from the speed controller, with built-in closed-loop PID pressure control and high-precision oil pressure sensor. The electrical signal is linearly converted into proportional hydraulic control oil pressure, and the output pressure drives the main steam valve and regulating valve hydraulic motor of the steam turbine, achieving precise adjustment of unit speed/load;
When there is a power outage, signal disconnection, or internal fault, the built-in reset spring automatically releases pressure to zero oil pressure, and the regulating valve is fully closed to meet the fail safe protection logic of the unit.
3、 Electrical key parameters
Power supply: DC 18-32V (rated 24VDC), steady-state 1.5A, peak 8A (100ms)
Given input: isolated 4-20mA, input impedance 250 Ω, supports single/dual redundant signal input
Feedback output: 4-20mA oil pressure transmission signal, maximum load of 300 Ω, accuracy ± 1% FS
Digital DI: Optical isolated 24VDC wet contact input; Digital DO: 1A@30VDC Fault alarm passive contact
Debugging interface: RS232 serial port, equipped with Woodward Service Tool software for calibration, waveform recording, and fault diagnosis
Protection level: IP66, whole machine cast aluminum anti-corrosion shell

4、 Hydraulic specifications (9907-1200 exclusive)
Oil supply pressure: up to 25 bar, recommended control output pressure ≤ 70% of oil supply pressure to ensure dynamic performance
Output regulation range: 0-10 bar
Medium: Turbine mineral oil/synthetic fire-resistant oil, recommended filtration accuracy of 24-40 μ m (ISO 20/16 oil pollution tolerance)
Oil viscosity: 20-100 cSt, equipped with a self dredging and flushing structure (Silk Buster), greatly reducing filter clogging faults
Oil port interface: standard NPT thread, integrated oil pressure sensing circuit
5、 Core product advantages
Strong resistance to oil pollution
Featuring a unique self-cleaning structure that can withstand impurities up to 40 μ m, it solves the pain points of traditional servo valves that are prone to jamming and frequent maintenance;
Ultra high control accuracy
Full range accuracy<± 0.2% FS, repeatability accuracy 0.1% FS, temperature drift ≤ ± 0.01% FS/℃, valve control without vibration;
Enhance dynamic response
Millisecond step adjustment, built-in 11 point line compensation, corrects valve flow nonlinearity;
Improve self diagnosis
Real time monitoring of power supply, input commands, oil pressure sensors, internal PID circuits, and uploading of faulty hard contacts to DCS;
Explosion proof safety design
Zone 2 chemical/power plant explosion-proof zone direct installation, CE, ATEX, PED, EMC multinational certification;
Local manual adjustment knob, can temporarily set output oil pressure on site without the need for a computer
6、 Comparison Table of CPC-II Models in the Same Series
table
Applicable scenarios of oil pressure explosion-proof partition structure for part number output
9907-1200 0~10bar Zone2 single channel standard model for ordinary steam turbine and chemical turbine (this model)
9907-1199 0~10bar Zone1/2 single channel Class I explosion-proof high-risk device
9907-1198 0~25bar Zone2 high-pressure single channel large stroke heavy-duty hydraulic engine
9907-1197 0~25bar Zone1/2 high-pressure explosion-proof hydrogenation and LNG high-pressure unit
9907-1253 0~10bar Zone2 dual channel redundant critical unit ETS redundancy protection
7、 Typical matching and application
Control system matching
Woodward 505/505E (9907-163), MicroNet, TG speed controller; It can also be connected to TRICONEX and Honeywell SIS systems with 4-20mA output
Device Scenarios
Small steam turbines and waste heat power generation turbines for thermal power/self owned power plants
Chemical compressor, drive turbine, gas turbine single acting regulating valve
Valve actuators in explosion-proof areas of oil and gas platforms and refining equipment
Hydraulic matching
Single acting hydraulic engine, wrong throttle, servo actuator, replacing old Voith E360 and traditional I/P converter