Description
The Woodward 9907-1106 is a high-performance CPC-II (Current-to-Pressure Converter) module manufactured by Woodward, Inc. It is engineered for critical steam and gas turbine management systems, acting as a precise electrohydraulic interface that converts a 4–20 mA current command signal from a digital controller into a proportional hydraulic output pressure to position turbine control valves and actuators.
Technical Specifications
| Parameter | Value |
| Manufacturer | Woodward, Inc. |
| Product Series | CPC-II (Current-to-Pressure Converter) |
| Part Number (MPN) | 9907-1106 |
| Input Signal | 4–20 mA current control command |
| Hydraulic Fluid Compatibility | Mineral-based and synthetic hydraulic oils conforming to standard turbine specifications |
| Operating Temperature | -40 to +70 °C |
| Enclosure Protection | IP56 / IP66 rated for rugged industrial and hazardous environment applications |
| Mounting Orientation | Designed for flexible mounting directly on or adjacent to turbine actuator assemblies |
Supply Terms & Commercial Details
- Availability: Sourced through specialized industrial automation surplus, turbine parts distributors, and authorized legacy hardware providers.
- Lead Time: In-stock hardware typically ships within 1 to 3 business days.
- Warranty: 12-month standard supplier replacement or repair warranty covering functional hardware defects.
- Condition: New Surplus, Factory Open Box, or Fully Tested Refurbished (verify specific calibration logs and test certificates with your vendor prior to purchase).
- Pricing Note: Price subject to market conditions; contact us for a firm quote.
Engineering & Integration Guidance
When installing or servicing the 9907-1106 CPC-II module within a turbine governing system, observe the following parameters:
- Hydraulic Filtration: Ensure supply hydraulic fluid meets strict cleanliness standards (typically ISO 4406 17/15/12 or better) to prevent particulate contamination from binding internal nozzle-flapper or spool assemblies.
- Supply Pressure Regulation: Verify that incoming hydraulic supply pressure stays within rated operational limits to maintain accurate valve positioning loops and prevent transient pressure drops.
- Electrical Shielding: Terminate shielded control cables correctly to ground to protect the low-level 4–20 mA input loop from electromagnetic interference (EMI) generated by nearby high-power variable frequency drives or generator excitation systems.
Frequently Asked Questions
What system applications use the Woodward 9907-1106?
This converter is deployed primarily in power generation and industrial turbomachinery applications to control steam or fuel valve servomotors via electrohydraulic feedback loops.
What is the primary function of the CPC-II unit?
The CPC-II converts an electronic 4–20 mA control signal from a digital governor (such as a MicroNet or Micronet Plus system) into a precise hydraulic pressure output to drive actuator pistons.
Is routine calibration required?
Yes, periodic verification of zero and span calibration parameters is recommended during scheduled turbine maintenance outages to ensure precise valve positioning accuracy.
