Woodward 9907 Series Modules - 9907-175

Technical Dossier

Product Details And Specifications

Woodward 9907 Series Technical Notes

The Woodward 9907 Series represents one of the most widely deployed families of industrial governor and control modules in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, offshore platforms, and large-scale gas turbine plants, the 9907 platform established Woodward's position as the dominant OEM supplier for speed governing, load sharing, and synchronization control in rotating machinery applications. Units from this series remain in active service across facilities in North America, the Middle East, and Southeast Asia, with installed base lifecycles routinely exceeding 20–30 years. The combination of modular architecture, deterministic analog/digital I/O, and field-proven reliability in Class I Division 2 environments has made the 9907 Series a reference standard for turbine control engineers worldwide.

The Evolution of 9907 Series Architecture

The 9907 Series was introduced by Woodward as a modular successor to earlier analog governor platforms, designed to bridge the transition from purely analog speed control to hybrid analog-digital architectures. Early variants such as the 9907-175 and 9907-164 relied on discrete analog signal conditioning with passive load-sharing bus topologies, compatible with Woodward's legacy 2301 and 505 governor families. As industrial control standards evolved through the 1990s and 2000s, the 9907 platform was extended to support RS-232/RS-485 serial communication, enabling integration with SCADA and DCS environments without requiring full governor replacement.

The series spans three functional generations: (1) pure analog load sharing and speed trim modules, (2) hybrid analog-digital modules with serial communication ports, and (3) late-generation modules with expanded I/O density and compatibility with Woodward's MicroNet and ProTech platforms. Backward compatibility within the 9907 backplane standard has been maintained across most generations, allowing facilities to upgrade individual modules without full panel redesign. As of 2026, the majority of 9907 Series modules are classified as mature or end-of-life by Woodward, with no new production runs confirmed. Long-term support is now exclusively available through authorized aftermarket suppliers and certified repair depots.

9907 Series Full Catalog & Functionalities (SKU List)

Load Sharing & Speed Trim Modules

• 9907-175: Analog load sharing module for parallel generator sets, isochronous operation
• 9907-164: Load sharing and speed trim module, 4–20 mA output, single-unit governor interface
• 9907-162: Load sharing module with droop/isochronous switch, panel-mount form factor
• 9907-1112: Multi-unit load sharing controller, supports up to 8 paralleled generators
• 9907-1114: Enhanced load sharing module with RS-232 serial port for SCADA integration

Speed Control & Governor Interface Modules

• 9907-205: Speed control interface module, magnetic pickup input, analog actuator output
• 9907-206: Dual-channel speed reference module, compatible with 2301A governor series
• 9907-238: Remote speed setting module, 4–20 mA input, isolated analog output
• 9907-252: Speed bias module for turbine synchronization, ±10 VDC output range
• 9907-263: Frequency/speed converter module, MPU to analog signal conditioning

Analog I/O & Signal Conditioning Modules

• 9907-032: Analog input module, 8-channel, 4–20 mA, DIN rail mount
• 9907-047: Isolated analog output module, 4-channel, 0–10 VDC, loop-powered
• 9907-068: Thermocouple input module, 6-channel, J/K/T type, cold junction compensated
• 9907-083: RTD input module, 4-channel, PT100/PT1000, 3-wire configuration

Communication & Synchronization Modules

• 9907-1116: Synchronizer module, voltage matching and phase angle control for bus tie applications
• 9907-1118: Load sharing communication adapter, RS-485 bus, Modbus RTU protocol

Quality Control for the 9907 Series Range

The 9907 Series presents specific quality control challenges due to its analog backplane bus architecture and the age profile of available inventory. DriveKNMS applies a multi-stage inspection protocol to all 9907 modules:

• Visual inspection for PCB corrosion, capacitor bulge, and connector pin integrity
• Powered bench test replicating the 9907 backplane bus environment, including load sharing bus signal injection
• Analog output calibration verification against original Woodward factory tolerance specifications (typically ±0.1% full scale)
• Serial communication port functional test (RS-232/RS-485) where applicable
• Thermal cycling test for modules destined for high-ambient-temperature installations
• Final functional test under simulated governor load conditions prior to packaging