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- Woodward
- 9905-001
- SPM-A Synchronizer
- USA
- 140 × 100 × 60 mm
- 1.69 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Woodward 9905-001 SPM-A Synchronizer is a synchronizing control device used in generator and prime-mover applications where an incoming generator must be matched with an energized bus before breaker closing. It works with the generator control system to coordinate the conditions required for a controlled synchronization sequence.
The SPM-A monitors electrical conditions such as generator and bus frequency and phase relationship and uses this information to determine when synchronization conditions are approaching the acceptable range. The associated control system can then use the synchronizer output to coordinate generator speed adjustment and breaker operation.
In generator installations, synchronization is particularly important when connecting an incoming generator to an energized bus or operating generators in parallel. Incorrect frequency, phase, or voltage relationships at breaker closure can produce substantial electrical and mechanical transients, so the synchronizer forms part of the control chain used to manage this operation.
The 9905-001 is applicable to generator control panels, engine-generator sets, and power-generation systems that use Woodward control equipment as part of their synchronization arrangement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Woodward |
| Model | 9905-001 |
| 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 | 140 × 100 × 60 mm |
| Weight | 1.69 kg |
Product Features
- SPM-A synchronizer for generator control applications
- Supports controlled synchronization of an incoming generator
- Monitors the relationship between generator and bus electrical conditions
- Suitable for generator-to-bus synchronization sequences
- Can be integrated with compatible Woodward control systems
- Applicable to engine-generator and power-generation installations
- Suitable for control-panel based generator automation
- Supports synchronization functions before generator breaker closing
Working Principle
The SPM-A operates by comparing the electrical condition of the incoming generator with the energized bus. Frequency and phase relationship are important parameters during this process because the generator must reach an acceptable synchronization condition before connection to the bus.
During synchronization, the synchronizer works with the generator speed-control system to influence the generator frequency toward the required value. As the phase relationship approaches the acceptable closing condition, the synchronizer can provide the appropriate synchronization signal to the associated breaker-control circuit.
A typical sequence can be represented as:
Generator → Voltage / Frequency Measurement → 9905-001 SPM-A → Speed Control / Breaker Control → Generator Breaker → Bus
The synchronizer does not replace the generator controller or the circuit breaker. Instead, it operates as part of the synchronization control chain, supplying the timing and synchronization information required for controlled connection.
If the generator and bus are not within the required synchronization conditions, the breaker-closing sequence should remain inhibited by the associated control system.
Role in Generator Control Architecture
The 9905-001 SPM-A Synchronizer normally sits between the electrical measurement and generator control functions. It works with the speed-control system and breaker-control circuit to coordinate generator connection to the bus.
Generator Voltage & Bus Voltage → Synchronization Measurement → SPM-A Synchronizer → Speed / Breaker Control → Generator Breaker
| System Element | Function |
|---|---|
| Generator | Supplies the electrical power to be synchronized |
| Bus | Provides the energized electrical system connection |
| Voltage Measurement | Supplies generator and bus electrical information |
| 9905-001 SPM-A | Evaluates synchronization conditions and provides control |
| Speed Control System | Adjusts generator speed and frequency |
| Breaker Control Circuit | Controls the generator breaker closing sequence |
| Generator Breaker | Connects the generator to the energized bus |
| Protection System | Provides electrical protection during generator operation |
This arrangement separates synchronization assessment from the actual mechanical speed-control and switching functions while allowing the individual systems to work together during generator connection.
Industrial Applications
| Application | Typical Use |
|---|---|
| Diesel Generator Sets | Synchronizing generator output with an energized bus |
| Gas Engine Generator Sets | Frequency and phase matching before breaker closing |
| Industrial Power Generation | Generator-to-bus synchronization |
| Standby Power Systems | Controlled transfer or parallel generator operation |
| Cogeneration Systems | Connecting generation equipment to an existing bus |
| Parallel Generator Systems | Coordinating individual generator connection |
| Utility Support Generation | Synchronization of generator equipment with a grid |
| Engine-Generator Control Panels | Local synchronization and breaker-control functions |
Installation and Maintenance
- Install the SPM-A in the designated generator control panel location with sufficient clearance for wiring and inspection.
- Verify that the model number and application configuration correspond to the intended generator-control system.
- Confirm the electrical measurement connections used for generator and bus synchronization.
- Check terminal wiring against the applicable control-panel wiring diagram before energizing the unit.
- Verify the connections to the generator speed-control system where synchronization commands are used.
- Check the interface between the synchronizer and the generator breaker-control circuit.
- Confirm that generator and bus voltage sensing signals are correctly identified and connected.
- Verify the synchronization sequence during commissioning under controlled operating conditions.
- Check that the generator frequency can be adjusted correctly during the synchronization process.
- Inspect terminal connections periodically for looseness, corrosion, or wiring damage.
- Investigate abnormal synchronization behavior by checking measurement signals, speed-control response, breaker-control logic, and associated wiring.
- After replacing the synchronizer, verify all electrical connections and synchronization functions before returning the generator system to normal service.
Compatible System Components
| Component | Function |
|---|---|
| Woodward Speed Control | Adjusts engine speed and generator frequency |
| Generator Voltage Sensing | Provides generator electrical measurement |
| Bus Voltage Sensing | Provides energized bus reference information |
| Generator Breaker | Connects the generator to the electrical bus |
| Breaker Control Circuit | Executes the generator breaker closing command |
| Generator Controller | Coordinates engine and generator operating functions |
| Protection Relay | Protects the generator and electrical system |
| Synchronizing Panel | Integrates measurement and synchronization functions |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Woodward SPM-A | Synchronizer | Generator-to-bus synchronization |
| Woodward SPM-D | Digital Synchronizer | Generator synchronization and control |
| Woodward easYgen | Generator Controller | Generator control and synchronization |
| Woodward easYgen-300 | Generator Control System | Engine-generator control |
| Woodward EGCP | Generator Control System | Generator load and parallel control |
| Woodward DSLC | Load Sharing Controller | Generator load sharing and paralleling |
Key Advantages
- Provides a dedicated synchronization function for generator applications
- Coordinates generator frequency and phase conditions before connection
- Can work with generator speed-control equipment during synchronization
- Suitable for generator-to-bus and parallel-generation applications
- Integrates into control-panel based generator architectures
- Helps prevent breaker closing outside the intended synchronization conditions
- Supports controlled generator connection in industrial power systems
Technical FAQs
What does the Woodward 9905-001 SPM-A do during generator synchronization?
The SPM-A evaluates the relationship between the incoming generator and the energized bus and participates in the control sequence used to achieve an acceptable synchronization condition before breaker closing.
Why can a generator fail to synchronize even when the SPM-A is powered?
A synchronization problem can originate from incorrect voltage-sensing connections, frequency mismatch, phase-reference problems, speed-control response, wiring errors, or breaker-control logic. The synchronizer should therefore be checked together with the associated measurement and control circuits.
Does the 9905-001 directly control the generator breaker?
The SPM-A forms part of the synchronization and breaker-control chain, but the complete breaker-closing function depends on the associated control circuitry, breaker interface, and generator-control architecture.
What should be checked when synchronization takes too long?
Check the generator frequency response first, followed by the generator and bus sensing signals, synchronization settings, phase relationship, speed-control response, and breaker-control circuit. Slow or unstable engine-speed correction can prevent the generator from reaching the required synchronization window efficiently.