Filtering the supply
The power-supply section filters the 18–32 Vdc input before the control electronics use it.
WOODWARDINDUSTRIAL TURBINE CONTROL
Woodward 9907-1200 CPC-II Enhanced Current-to-Pressure Converter
CPC-II Enhanced · 10 bar · electrohydraulic pressure control
01
Product Description
Woodward 9907-1200 is a CPC-II Enhanced current-to-pressure converter for a 10 bar electrohydraulic control path. It converts a 4–20 mA setpoint into controlled hydraulic pressure for the connected valve actuator circuit.
Inside Woodward 9907-1200, the power supply filters the 18–32 Vdc input, the isolated input receives the setpoint, and the pressure-control loop drives a limited-angle rotary actuator. A pressure sensor returns feedback to the PCB so the microprocessor can regulate the control pressure.
Woodward 9907-1200 receives a 4–20 mA demand, compares it with pressure feedback and drives the limited-angle actuator that regulates the 0–10 bar control output. The separate analog readback and discrete fault outputs report the controlled pressure and converter state to the receiving system.
02
Product Specifications
| Technical Item | 9907-1200 |
|---|---|
| Brand | Woodward |
| Product type | CPC-II Enhanced current-to-pressure converter |
| Supply/control pressure | 10 bar / 145 psi |
| Supply voltage | 18–32 Vdc, 24 Vdc nominal |
| Steady power | 25 W |
| Transient power | 90 W for up to 2 s |
| Setpoint input | 4–20 mA into 200 ohms |
| Analog output | 4–20 mA, maximum 500 ohm load |
| Accuracy | ±0.5% of full scale |
| Discrete output | Configurable NO/NC, 0.5 A at 24 Vdc |
| Hydraulic mounting | Flat face with three holes |
| Control pressure | 0–10 bar(g) / 0–145 psig |
| Drain pressure | 2 bar maximum or 30% of minimum control pressure |
| Ingress protection | IP66 per IEC EN 60529 |
| Ambient temperature | −40 to +85 °C |
03
Current-to-Pressure Regulation
Woodward 9907-1200 converts an electrical demand into a controlled hydraulic pressure signal.
Regulating pressure
The PI pressure loop compares demand and feedback, then drives the rotary actuator and hydraulic valve.
Reporting output
The analog output and discrete outputs provide the configured pressure readback and fault/alarm indications.
04
Feedback and Fault Outputs
Woodward 9907-1200 combines feedback, fault outputs and thermal/current limits to supervise the converter path.
Pressure feedback
The pressure sensor returns the controlled value to the PCB for closed-loop regulation.
Current limiting
The actuator drive includes current limiting for thermal protection.
Fault annunciation
Dual discrete outputs provide configurable fault and alarm states for the connected control system.
05
Frequently Asked Questions
What input signal does Woodward 9907-1200 use?
Woodward 9907-1200 receives a 4–20 mA setpoint into 200 ohms. Verify the source loop, common-mode condition and input wiring before adjusting the pressure loop.
Which pressure class belongs to Woodward 9907-1200?
The 9907-1200 is the 10 bar supply/control version, with a 0–10 bar(g) control range. Do not apply the 25 bar values from other CPC-II variants.
How should a pressure instability on Woodward 9907-1200 be investigated?
Check the setpoint signal, pressure feedback, drain pressure and dynamic settings in that order. A stable demand signal is required before judging the CPC response.
What cable entry arrangement does Woodward 9907-1200 use?
The electrical cable enters through two ¾-14 NPT threaded ports suitable for conduit or certified cable-gland fittings. Match the entry hardware to the installation classification.
Can the 4–20 mA output of Woodward 9907-1200 drive any load?
No. The analog output is specified for a maximum external load of 500 ohms. Include both the receiving device and wire resistance in the load check.
What should be checked if the Woodward 9907-1200 slave takes control?
Check the health link, redundant-unit wiring and the master fault/alarm states before changing the converter. A slave transfer indicates a control-path condition that must be diagnosed at the redundant interface.
06
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07
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