WOODWARD 9900 Series Modules | 9907-027 Sharing Module Generator Module

Technical Dossier

Product Details And Specifications

WOODWARD 9900 Series: Comprehensive Module Range and Technical Overview

The WOODWARD 9900 Series represents one of the most widely deployed generator control and load-sharing platforms in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, offshore platforms, and large-scale cogeneration facilities, the 9900 Series established the benchmark for isochronous load sharing and frequency regulation in paralleled generator sets. Its modular backplane architecture allows field-level replacement of discrete functional cards without full controller shutdown, a critical requirement in continuous-process environments where unplanned outages carry significant operational cost. The series remains active in thousands of installations worldwide, with a substantial installed base in facilities operating under 20- to 40-year asset lifecycles.

The Evolution of 9900 Series Architecture

The WOODWARD 9900 Series was introduced as a successor to earlier analog governor platforms, transitioning load-sharing logic from discrete relay-based circuits to digitally supervised analog control loops. Early variants (circa late 1980s–1990s) used parallel backplane communication with dedicated point-to-point wiring between the sharing module and speed control cards. Mid-generation revisions introduced isolated analog bus structures, improving noise immunity in high-EMI generator room environments. Later production runs incorporated improved EEPROM-based calibration storage, reducing the need for manual potentiometer adjustment during commissioning.

Compatibility across sub-generations is constrained by backplane connector pinout revisions and firmware-dependent calibration protocols. Modules from early production batches are not always interchangeable with later revisions without recalibration. As the 9900 Series has entered its end-of-production phase, sourcing verified replacement modules with matching revision levels is essential for maintaining system integrity. WOODWARD's current product line has migrated toward the EasYgen and MFR series for new installations, but the 9900 platform remains the dominant control architecture in legacy fleet maintenance contracts.

9900 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced components within the WOODWARD 9900 Series. Each module performs a discrete function within the generator control backplane:

9907-027: Load-sharing module for paralleled generator sets; governs real power (kW) distribution between units operating in isochronous mode.
9907-018: Speed control module; provides primary governor output signal to fuel actuator or electronic throttle.
9907-020: Analog input/output interface module; conditions 4–20 mA and 0–10 V field signals for backplane processing.
9907-022: Digital input module; accepts discrete contact closures from switchgear, breaker auxiliary contacts, and protection relays.
9907-024: Digital output module; drives relay coils and solenoid actuators from backplane logic commands.
9907-026: Power supply module; converts site AC/DC input to regulated backplane voltages (+5 V, ±15 V).
9907-030: Communication adapter module; provides RS-232/RS-485 serial interface for SCADA and HMI integration.
9907-032: Reactive power (kVAR) sharing module; coordinates reactive load distribution between paralleled alternators.
9907-034: Voltage regulation interface module; interfaces with AVR (Automatic Voltage Regulator) for closed-loop terminal voltage control.
9907-036: Frequency bias module; applies external frequency offset signals for grid-parallel synchronization.
9907-038: Isochronous/droop selector module; configures governor response mode per unit operating state.
9907-040: Magnetic pickup signal conditioner; converts MPU speed sensor output to clean digital pulse train for governor processing.
9907-042: Actuator driver module; provides high-current output stage for electro-hydraulic and electro-pneumatic fuel actuators.
9907-044: Alarm and annunciator module; manages first-out fault sequencing and panel lamp driver outputs.
9907-046: Synchronizer module; performs automatic phase-angle and frequency matching prior to breaker close command.
9907-050: Redundancy switchover module; monitors primary control channel health and executes bumpless transfer to backup channel.
9907-052: Analog output expansion module; adds additional 4–20 mA output channels for remote metering and trending.

Sourcing Hard-to-Find & Obsolete 9900 Series Parts

WOODWARD has formally discontinued new production of the majority of 9900 Series modules. Standard distribution channels no longer carry active stock, and lead times through OEM repair programs can extend to 16–24 weeks. DriveKNMS maintains a dedicated inventory of tested 9900 Series modules sourced from decommissioned plant assets, controlled surplus, and verified aftermarket channels. Each unit is cataloged by part number, revision suffix, and functional test status prior to listing. For facilities operating under long-term maintenance agreements or regulatory inspection cycles, DriveKNMS provides documented traceability records and can supply matched revision pairs for redundant control architectures. Requests for obsolete or low-volume SKUs not listed above are accepted via direct inquiry — response within one business day.

Quality Control for the 9900 Series Range

The 9900 Series backplane uses a passive analog bus with active module termination. Testing procedures for these modules require replication of the backplane voltage rails and bus loading conditions; standard bench power supply testing without bus simulation produces unreliable pass/fail results. DriveKNMS applies a dedicated 9900 Series test fixture that replicates the backplane electrical environment, including differential sharing bus loading, MPU signal injection, and actuator output load simulation. Each module undergoes: (1) static power-on verification of all regulated supply rails; (2) functional signal-path testing across all I/O channels at rated load; (3) thermal soak at operating temperature for a minimum of two hours; (4) final calibration verification against factory reference values where applicable. Modules that do not meet all acceptance criteria are quarantined and not offered for sale.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.