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- Woodward
- 9907-252
- Load Sharing Module
- USA
- 273.6 × 214.1 × 59.2 mm
- 1.488 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Woodward 9907-252 Load Sharing Module is used in multi-engine or multi-generator control systems where operating load needs to be coordinated between parallel prime movers. It forms part of the electrical control architecture that allows individual generating units to contribute to a common load without operating independently of the other units.
In a typical generator installation, several engine-generator sets may be connected to a common electrical bus. Each unit must respond to changing load conditions while maintaining an appropriate share of the total demand. The load sharing module works with the associated Woodward governing and control equipment to exchange the information required for coordinated load response.
The module is therefore relevant to generator synchronization and load-control arrangements where multiple prime movers operate together. During commissioning or maintenance, the module should be considered together with the governors, speed/load controls, generator controls, electrical measurement circuits, and communication or load-sharing connections that make up the complete parallel-generation system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 9907-252 |
| Product Type | Load Sharing Module |
| Product Family | Woodward Load Sharing Controls |
| Series | 9907 Series |
| Component Category | Generator Control Interface |
| System Role | Generator Load Coordination |
| Control Function | Load Sharing and Load Coordination |
| Application | Parallel Generator Operation |
| System Integration | Woodward Generator Governing System |
| Interface Function | Load-Sharing Signal Interface |
| Control Architecture | Multi-Unit Generator Control |
| Component Type | Electronic Load Sharing Module |
| Installation | Generator Control System |
| Operating Function | Coordinated Generator Load Response |
| Dimensions | 273.6 × 214.1 × 59.2 mm |
| Weight | 1.488 kg |
Product Features
- Load sharing module for parallel generator control applications
- Supports coordinated load response between multiple generating units
- Works with associated Woodward governing and generator-control equipment
- Helps distribute common electrical demand among operating generator sets
- Suitable for multi-engine and multi-generator installations
- Participates in the control architecture used for parallel prime movers
- Supports coordinated response when generator loading changes
- Can be integrated into established Woodward generator control systems
- Useful for commissioning, troubleshooting, and maintenance of load-sharing systems
- Functions as part of the control system rather than as an independent generator controller
Working Principle
The 9907-252 operates within a parallel-generation control system in which two or more generator sets contribute to a common electrical load. The module participates in the exchange and processing of load-related control information so that the associated governing system can adjust individual prime movers as the total system demand changes.
When the common electrical load increases, the control system determines how the operating generator units should respond. Load-sharing information is used by the associated governing equipment to modify prime-mover output. When demand decreases, the same control arrangement allows the units to reduce their contribution in a coordinated manner.
A simplified control path is:
Generator / Load Measurement → Load-Sharing Control → 9907-252 → Associated Governor → Prime Mover → Generator → Common Electrical Bus
The actual control arrangement depends on the complete generator system and its associated Woodward equipment. The module should therefore not be treated as a standalone load controller. Proper operation depends on correct connections, compatible governing equipment, generator configuration, and the overall parallel-generation control strategy.
Role in a Parallel Generator Control Architecture
The 9907-252 occupies the load-coordination layer of a multi-unit generator control system. It works between the load-sharing information and the governing equipment responsible for changing prime-mover output.
| Control Architecture Layer | Function | Relationship to 9907-252 |
|---|---|---|
| Plant / Supervisory Layer | Monitors generator operation and electrical demand | Provides operating context |
| Generator Control Layer | Coordinates generator-set operation | Works with load-sharing functions |
| Load Sharing Layer | Coordinates the contribution of individual units | 9907-252 |
| Governor Layer | Adjusts prime-mover output | Responds to load-sharing control |
| Prime-Mover Layer | Produces mechanical power | Engine or turbine |
| Generator Layer | Converts mechanical power into electrical output | Supplies the common bus |
| Electrical Bus | Combines the output of parallel units | Receives power from multiple generators |
| Load Layer | Consumes generated electrical power | Determines overall system demand |
Industrial Applications
| Application | Typical Use |
|---|---|
| Parallel Generator Sets | Coordinates load contribution between multiple generating units |
| Power Generation Plants | Supports multi-unit generator control architectures |
| Industrial Generator Systems | Helps maintain coordinated loading across operating units |
| Emergency Power Systems | Used where several generator sets operate together |
| Standby Power Plants | Supports coordinated generator response during common-load operation |
| Marine Power Systems | Applicable to multi-generator electrical systems where supported by the control architecture |
| Engine-Driven Generators | Integrates load-sharing functions with prime-mover governing |
| Industrial Microgrids | Supports coordinated operation of multiple generator units within a common electrical system |
Installation and Maintenance
- Verify the model identification — Confirm that the installed or replacement module is the Woodward 9907-252 and matches the documented load-sharing architecture.
- Review generator documentation — Check the applicable Woodward control manuals, generator configuration documents, wiring diagrams, and load-sharing procedures before installation or service.
- Isolate the generator system — Place the affected generator units and associated electrical equipment in the required maintenance condition before working on the module or its wiring.
- Identify load-sharing connections — Document the existing signal and control connections before disconnecting the module so that each connection can be restored correctly.
- Inspect the module — Examine the housing, terminals, mounting points, and accessible surfaces for visible damage, contamination, or signs of overheating.
- Inspect associated control equipment — Check the governors, generator controls, electrical measurement circuits, and related wiring for loose or damaged connections.
- Confirm mounting arrangement — Install the module securely in the intended control-system location and avoid mechanical stress on connected wiring.
- Reconnect control wiring — Restore the documented connections and verify each connection against the applicable wiring diagram before energizing the system.
- Check the load-sharing architecture — Confirm that all participating generator units, governors, and associated control equipment are configured for the intended parallel operating arrangement.
- Perform a controlled load-sharing test — After preliminary checks, test generator response under controlled conditions and verify that the participating units respond appropriately to changes in common load.
- Monitor generator behavior — Observe load distribution, generator output, alarms, speed response, and available control diagnostics during commissioning and subsequent operation.
- Document maintenance results — Record the module identification, wiring verification, test results, configuration changes, and any abnormal findings for future troubleshooting.
Related Components
| Component | Function |
|---|---|
| Woodward Electronic Governor | Regulates prime-mover operation in response to control commands |
| Generator Controller | Coordinates generator operating functions |
| Speed Sensor | Provides rotational-speed feedback to the governing system |
| Generator | Converts prime-mover mechanical power into electrical output |
| Load Measurement System | Provides information about electrical loading |
| Synchronizing Equipment | Supports connection and coordinated operation of generators on a common bus |
| Common Electrical Bus | Combines the output of parallel generator units |
| Engine | Provides mechanical power for the generator |
| Turbine | Provides mechanical power in applicable turbine-driven generation systems |
| Plant Control System | Supervises generator operation and overall electrical system status |
Recommended Related Models
| Model | Product Type | Series / Family |
|---|---|---|
| Woodward 9907 Series | Generator and Control Hardware | 9907 Series |
| Woodward Load Sharing Controls | Load Coordination Equipment | Woodward Generator Controls |
| Woodward Electronic Governors | Electronic Governor | Woodward Control Systems |
| Woodward Generator Controls | Generator Control Equipment | Woodward Control Systems |
| Woodward Synchronizing and Load Control Systems | Generator Parallel-Control Equipment | Woodward Generator Controls |
Key Advantages
- Supports coordinated operation of parallel generator sets.
- Integrates load-sharing functions into a Woodward generator control architecture.
- Helps associated governors respond to changes in common electrical demand.
- Suitable for multi-unit generator installations.
- Provides a dedicated load-coordination function within the control system.
- Useful for maintenance and commissioning of established parallel-generation systems.
Technical FAQs
What is the purpose of the Woodward 9907-252?
The 9907-252 is a load sharing module used within parallel generator control systems. It participates in coordinating the operating contribution of multiple generator units connected to a common electrical system.
Does the 9907-252 directly control the generator output?
The module should not be treated as a standalone generator controller. It works with associated Woodward governing and generator-control equipment, which uses load-sharing information to regulate the prime mover and consequently the generator’s electrical contribution.
Why is load sharing important when generators operate in parallel?
When multiple generator sets supply a common electrical bus, their operating response needs to be coordinated as system demand changes. Load-sharing control helps the participating units adjust their contribution as part of the overall parallel-generation strategy.
What should be checked when replacing a 9907-252?
The load-sharing wiring, participating generators, associated governors, generator-control equipment, measurement circuits, and documented parallel-operation configuration should all be verified. A controlled load-sharing test should be performed after installation before returning the system to normal operation.