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- Woodward
- 9905-002
- SPM-A Synchronizer
- USA
- 150 × 120 × 50 mm
- 0.75 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Woodward 9905-002 SPM-A Synchronizer is a dedicated synchronization device for generator control applications. It is used when an incoming generator needs to be brought into suitable electrical alignment with an energized bus before its circuit breaker is closed.
In an engine-generator system, the synchronizer works with generator speed-control and breaker-control equipment to coordinate the connection process. It evaluates the relationship between the generator and bus so that the generator can approach the required frequency and phase condition before connection.
The 9905-002 is useful in generator sets operating in parallel with an existing power source, another generator, or an industrial distribution bus. Proper synchronization reduces the risk of severe electrical transients and mechanical stress that can occur when a generator is connected under unsuitable conditions.
Its practical role is therefore focused on the synchronization stage of generator operation rather than replacing the generator controller, excitation system, protection relay, or breaker itself.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Woodward |
| Model | 9905-002 |
| Product Family | SPM-A |
| Product Series | SPM |
| Product Type | Synchronizer |
| Primary Function | Generator-to-bus synchronization |
| System Role | Synchronizing control device |
| Application | Generator control and power-system synchronization |
| Installation | Generator control panel / control cabinet |
| Dimensions | 150 × 120 × 50 mm |
| Weight | 0.75 kg |
Product Features
- SPM-A synchronizer for generator applications
- Supports controlled synchronization with an energized bus
- Monitors the electrical relationship between generator and bus
- Works with associated generator speed-control equipment
- Supports generator breaker closing sequences
- Suitable for parallel generator operation
- Can be incorporated into generator control panels
- Applicable to industrial and standby power-generation systems
Working Principle
The 9905-002 monitors the electrical relationship between the incoming generator and the reference bus during the synchronization process. Generator frequency and phase relationship are used to determine whether the generator is approaching a suitable point for connection.
When the generator frequency is different from the bus frequency, the synchronizer works with the associated speed-control system to bring the generator toward the required operating condition. As the phase relationship approaches the desired synchronization point, the synchronizer can participate in the breaker-closing sequence.
A typical control path is:
Generator → Voltage / Frequency Sensing → 9905-002 SPM-A → Speed Control → Breaker Control → Generator Breaker → Bus
The synchronizer is one part of this sequence. The speed-control system remains responsible for adjusting engine speed, while the breaker and its associated control circuit perform the physical electrical connection.
If the generator does not reach the required synchronization conditions, the associated control system should prevent an inappropriate breaker-closing operation.
Role in Generator Control Architecture
The 9905-002 SPM-A Synchronizer occupies the synchronization-control stage between electrical measurement and generator connection. It works with the generator speed-control system and breaker-control circuitry to coordinate the final connection to the bus.
Generator / Bus Electrical Measurements → 9905-002 SPM-A → Speed Control → Breaker Control → Generator Breaker
| System Element | Function |
|---|---|
| Generator | Supplies the incoming electrical power |
| Bus | Provides the synchronization reference |
| Generator Sensing | Supplies generator electrical information |
| Bus Sensing | Supplies bus electrical information |
| 9905-002 SPM-A | Evaluates synchronization conditions |
| Speed Control | Adjusts engine speed and generator frequency |
| Voltage Regulator | Controls generator excitation and voltage |
| Breaker Control | Manages the generator breaker closing sequence |
| Generator Breaker | Connects the generator to the energized bus |
| Protection System | Protects the generator and electrical installation |
The synchronizer therefore works as part of a coordinated generator-control architecture rather than functioning as a complete generator management controller.
Industrial Applications
| Application | Typical Use |
|---|---|
| Diesel Generator Sets | Synchronizing generator output with an energized bus |
| Gas Engine Generators | Matching generator frequency and phase before closing |
| Standby Power Systems | Controlled generator connection and parallel operation |
| Industrial Power Plants | Generator-to-bus synchronization |
| Cogeneration Systems | Connecting generation equipment to an existing bus |
| Parallel Generator Systems | Synchronizing multiple generator sets |
| Engine-Generator Control Panels | Dedicated synchronization function |
| Distributed Generation | Coordinating generator connection to a local power system |
Installation and Maintenance
- Install the 9905-002 in the designated generator control-panel location.
- Verify the model number and application requirements before connecting the unit.
- Confirm generator and bus sensing connections against the applicable control-system wiring diagram.
- Check all terminals for correct identification and secure connections.
- Verify the interface between the synchronizer and the generator speed-control system.
- Check the breaker-control connection associated with the synchronization sequence.
- Confirm that generator and bus electrical sensing signals are available and correctly referenced.
- Test the synchronization sequence under controlled commissioning conditions.
- Observe generator speed response to confirm that frequency can be brought toward the bus frequency.
- Inspect terminals and wiring periodically for looseness, corrosion, or physical damage.
- If synchronization is slow or unstable, check sensing signals, speed-control response, settings, and breaker-control logic.
- After replacement, perform a complete synchronization and breaker-control test before returning the generator system to service.
Compatible System Components
| Component | Function |
|---|---|
| Woodward Speed Control | Adjusts engine speed during synchronization |
| Automatic Voltage Regulator | Controls generator excitation and voltage |
| Generator Voltage Sensing | Supplies generator electrical reference information |
| Bus Voltage Sensing | Supplies bus reference information |
| Generator Breaker | Connects the generator to the energized bus |
| Breaker Control Circuit | Executes the generator breaker operating sequence |
| Generator Protection Relay | Detects faults and abnormal electrical conditions |
| Generator Controller | Coordinates engine and generator operating functions |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Woodward SPM-A | Synchronizer | Generator synchronization |
| Woodward SPM-D | Digital Synchronizer | Generator synchronization and control |
| Woodward easYgen | Generator Controller | Engine-generator control |
| Woodward easYgen-300 | Generator Control System | Generator operation and synchronization |
| Woodward EGCP | Generator Control System | Generator paralleling and load control |
| Woodward DSLC | Load Sharing Controller | Generator load sharing and paralleling |
Key Advantages
- Dedicated synchronization function for generator control applications
- Coordinates generator electrical conditions before breaker connection
- Works with speed-control equipment during the synchronization process
- Suitable for generator-to-bus and parallel-generation applications
- Integrates with generator breaker-control circuits
- Supports controlled connection of generating equipment to an energized bus
- Suitable for industrial and standby generator installations
Technical FAQs
What is the main function of the Woodward 9905-002 SPM-A?
The 9905-002 is used to coordinate generator synchronization with an energized bus before the generator breaker is closed.
Why is frequency matching necessary before breaker closing?
A significant frequency difference between the incoming generator and the bus can cause the phase relationship to change rapidly. Matching the generator frequency helps the control system achieve a suitable synchronization point for controlled breaker closing.
What should be investigated if the generator remains out of synchronization?
Check the generator and bus sensing circuits first, followed by generator frequency, engine speed response, synchronization settings, wiring, and breaker-control logic. A synchronization fault does not necessarily indicate a problem with the synchronizer itself.
How does the synchronizer interact with the engine speed controller?
The synchronizer can provide synchronization-related control information to the associated speed-control system. The speed controller then adjusts engine speed so that generator frequency can approach the bus frequency required for synchronization.