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Overview
The 9905-001K SPM-A synchronizer from Woodward is a dedicated generator synchronization controller designed to coordinate generator sets with an energized bus or utility grid. The device performs automatic matching of electrical parameters before breaker engagement, ensuring safe and stable parallel operation.
The 9905-001K integrates frequency correction, voltage trimming, and phase alignment within a compact analog control module. It is commonly installed in generator control panels for diesel, gas turbine, and gas-engine generator systems used in industrial power plants, marine power systems, and standby generation facilities.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 9905-001K |
| Manufacturer | Woodward |
| Product Type | SPM-A Synchronizer / Phase Matching Controller |
| Synchronization Method | Automatic frequency, voltage and phase matching |
| Supply Voltage | 12–32 VDC |
| Synchronizing Functions | Frequency correction, phase comparison, voltage adjustment, breaker close signal |
| Operating Principle | Analog synchronization controller with phase-matching logic |
| Dimensions | 140 × 100 × 60 mm |
| Weight | 1.7 kg |
| Installation | Control panel mounting |
| Application | Generator paralleling with grid or busbar |
Operating Functions
The 9905-001K performs continuous monitoring and adjustment of generator electrical parameters to ensure proper synchronization before circuit breaker closure. Its core control tasks include:
Frequency matching between generator output and bus frequency
Voltage trimming through excitation control signals
Phase angle comparison and alignment
Controlled breaker close command once synchronization limits are satisfied
This control logic prevents out-of-phase connections that could cause mechanical stress or electrical damage to the generator or switchgear.
Typical Applications
The 9905-001K synchronizer is frequently deployed in power systems requiring reliable generator paralleling:
Industrial diesel generator plants
Gas engine or turbine generator packages
Marine vessel power management systems
Emergency and standby generator installations
Utility-connected cogeneration systems
Installation and System Compatibility
The synchronizer interfaces with generator governor and excitation systems to correct frequency and voltage deviations. During installation, wiring must follow the Woodward SPM-A synchronization control scheme to ensure proper signal routing for speed and voltage correction.
Correct integration with breaker control circuits and protection relays is essential to prevent unsafe switching conditions.
Maintenance Recommendations
Periodic verification of synchronization accuracy is recommended in generator maintenance programs. Functional testing of phase matching and breaker permissive logic helps ensure long-term reliability in parallel generator operation.
FAQ
What is the primary role of the SPM-A synchronizer?
The device automatically aligns generator frequency, voltage, and phase with the grid or busbar before allowing the circuit breaker to close.
Can the synchronizer work with different generator types?
Yes. It is compatible with diesel engine generators, gas engine generators, and turbine-driven generators when proper governor and excitation interfaces are available.
Does the synchronizer directly control the generator breaker?
It provides a permissive close signal only after synchronization conditions fall within acceptable limits.
