Woodward | 9907-1199 | CPC-II Current-to-Pressure Converter

Product Description

The Woodward 9907-1199 is a CPC-II Current-to-Pressure Converter designed for precise hydraulic pressure control in industrial turbine applications. It converts a 4–20 mA electrical demand signal into a proportional hydraulic control pressure for positioning steam valves, fuel valves, and associated servo systems.

This model is rated for a 10 bar supply and control pressure range and is configured for hazardous-area applications, including Class I, Division 1 and Zone 1/Zone 2 installations, subject to the applicable certification and installation requirements.

The CPC-II uses an electronically controlled rotary hydraulic valve and an integrated pressure feedback system to regulate output pressure. It also provides diagnostic functions and configurable analog and discrete signals for monitoring and system integration.

Product Datasheet & Parameters

• Brand: Woodward
• Model: 9907-1199
• Series: CPC-II
• Product Name: Current-to-Pressure Converter
• Product Type: Electro-hydraulic control device
• Control Function: 4–20 mA signal to proportional hydraulic pressure
• Pressure Rating: 10 bar supply pressure
• Control Pressure Range: 0–10 bar(g)
• Power Requirements: 18–32 VDC, 24 VDC nominal
• Power Consumption: 25 W steady state; 90 W transient for up to 2 seconds
• Analog Input: 4–20 mA
• Analog Output: 4–20 mA
• Discrete Outputs: Configurable NO/NC, 0.5 A at 24 VDC
• Protection Rating: IP66
• Operating Temperature: -40°C to +85°C
• Hydraulic Fluid: Compatible mineral-based or synthetic-based oils, subject to Woodward fluid requirements
• Mounting: Manifold-mounted hydraulic interface
• Dimensions: Approx. 270 × 270 × 290 mm
• Weight: Approx. 25 kg without oil
• Hazardous-Area Classification: Class I, Division 1 / ATEX Zone 1 configurations, subject to certification details
• Place of Manufacture: Verify from the product nameplate
• Country of Origin: The marketplace listing states China; verify the actual unit’s origin marking
• Product Condition: Listed as New; confirm packaging and physical condition before purchase
• Discontinued Status: Current production status should be confirmed with Woodward

 

Main Product Features

• Converts a standard 4–20 mA command into controlled hydraulic pressure.
• Designed for steam turbine and fuel valve positioning applications.
• Provides pressure feedback and electronic pressure regulation.
• Supports a secondary analog input for redundant setpoint or feedback configurations.
• Includes configurable analog and discrete outputs for system monitoring.
• Provides diagnostic functions for fault identification and maintenance.
• Uses a three-way rotary hydraulic valve to regulate supply, control, and drain flow.
• Includes a spring-return mechanism that directs control pressure to drain when power is lost or a diagnostic shutdown condition occurs.
• IP66 enclosure for demanding industrial installation environments.

 

Daily Maintenance and Care

1. Hydraulic Oil Inspection
   Check oil level, condition, and cleanliness. Use an oil type compatible with Woodward requirements.
2. Filter Maintenance
   Maintain the external hydraulic supply filter. The manual recommends a 24–40 μm nominal filter and ISO 20/16 fluid cleanliness or better.
3. Pressure Monitoring
   Compare the 4–20 mA demand signal with the actual hydraulic pressure feedback. Investigate unstable output or abnormal pressure deviation.
4. Electrical Inspection
   Check power connections, grounding, cable glands, and terminal tightness. Confirm that the supply remains within the specified 18–32 VDC range.
5. Enclosure Inspection
   Inspect the housing, cover seal, mounting surface, and cable entries for damage, corrosion, or oil leakage.
6. Diagnostic Review
   Use the CPC-II service tool to review device status, alarms, input signals, and pressure-control performance.

 

Troubleshooting and Common Problems

Problem: No Hydraulic Output Pressure

• Check the 18–32 VDC power supply.
• Verify that the 4–20 mA command signal is present.
• Inspect hydraulic supply pressure and isolation valves.
• Check for active diagnostic shutdown conditions.

Problem: Unstable Pressure Output

• Inspect hydraulic oil cleanliness and filter condition.
• Check for air in the hydraulic lines.
• Verify pressure feedback and input signal scaling.
• Review the control settings using the CPC-II service tool.

Problem: Incorrect Pressure Response

• Confirm that the pressure range and signal scaling match the application.
• Inspect the hydraulic supply and drain connections.
• Check the servo system for leakage or mechanical resistance.
• Verify the configured pressure demand linearization.

Problem: Communication or Diagnostic Alarm

• Inspect the service connection and wiring.
• Check the diagnostic status and fault indications.
• Confirm that the service software and device configuration are compatible.

Problem: Output Pressure Drops Unexpectedly

• Check for loss of electrical power.
• Inspect the hydraulic supply and drain paths.
• Review shutdown and fault conditions.
• Verify that the actuator and valve system are operating correctly.

 

Installation and Safety Precautions

• Confirm that model 9907-1199 matches the required 10 bar pressure configuration.
• Verify the hazardous-area certification required by the installation site.
• Follow the specified hydraulic port arrangement and mounting instructions.
• Use suitable wiring, grounding, and certified cable-entry fittings.
• Do not connect or disconnect electrical wiring while energized in a hazardous area.
• Depressurize the hydraulic system before servicing connections.
• Keep hydraulic oil clean and use the specified filtration arrangement.
• Commission the converter with the turbine or prime mover protected by an independent overspeed shutdown system.
• Installation, calibration, and servicing should be performed by qualified personnel.

 

Frequently Asked Questions

Q1: Is Woodward 9907-1199 a PLC module?

A: No. It is a CPC-II current-to-pressure converter. Its function is to convert an electrical current command into hydraulic control pressure.

Q2: What is the pressure rating of model 9907-1199?

A: It is the 10 bar CPC-II model, with a specified control pressure range of 0–10 bar(g).

Q3: What input signal does it use?

A: The primary setpoint input is 4–20 mA. A secondary 4–20 mA input is also available for configured redundant setpoint or feedback functions.

Q4: What power supply is required?

A: The specified supply voltage is 18–32 VDC, with 24 VDC nominal.

Q5: Where is this converter commonly used?

A: It is used in industrial turbine hydraulic control systems, including steam valve, fuel valve, and servo positioning applications.

Q6: Can it be used in hazardous areas?

A: Model 9907-1199 is listed for applicable hazardous-area configurations. Always verify the certification markings and installation requirements of the actual unit.

Q7: What should be checked before replacement?

A: Confirm the part number, pressure rating, hydraulic interface, electrical connections, signal configuration, and service-tool settings before installing a replacement.

 

Recommended Woodward Models and Related Parts

1. 9907-1200 – CPC-II 10 bar current-to-pressure converter for applicable Zone 2 installations.
2. 9907-1228 – CPC-II 10 bar model for specified hazardous-area configurations.
3. 9907-1349 – CPC-II 10 bar model for specified hazardous-area configurations.
4. 9907-1198 – CPC-II 25 bar current-to-pressure converter for applicable Zone 2 installations.
5. 9907-1197 – CPC-II 25 bar current-to-pressure converter for applicable Zone 1/Zone 2 installations.
6. 9907-1253 – Dual-redundant CPC-II 10 bar model.
7. 9907-1254 – Dual-redundant CPC-II 25 bar model.
8. 8918-116 – CPC-DX dual-redundant transfer skid, 10 bar configuration.
9. 8918-118 – CPC-DX dual-redundant transfer skid, 25 bar configuration.
10. 8928-7240 – CPC-II Voith E360 adapter manifold.
11. 8923-2276 – CPC-II converter manifold.
12. 8923-1996 – CPC-DX 10 bar CPC replacement kit.
13. 8923-1997 – CPC-DX 25 bar CPC replacement kit.
14. 8923-2236 – CPC-DX replacement isolation valve kit.
15. 8923-2242 – CPC-DX replacement isolation valve kit.

Note: Related models and accessories have different pressure ratings, hazardous-area approvals, and mounting arrangements. Confirm system compatibility before ordering.