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9907-028 Woodward SPM-A Speed and Phase Synchronizer

9907-028 Woodward SPM-A Speed and Phase Synchronizer

Product Description

The Woodward 9907-028 is an analog-based synchronization module from the SPM-A line, designed to provide automatic frequency and phase matching for engine-generator sets. It generates a corrective bias signal to the speed governor, ensuring that the circuit breaker closes only...

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SKU: 9907-028
Vendor: Woodward
Category: Speed and Phase Synchronizer
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Product Description

The Woodward 9907-028 is an analog-based synchronization module from the SPM-A line, designed to provide automatic frequency and phase matching for engine-generator sets. It generates a corrective bias signal to the speed governor, ensuring that the circuit breaker closes only when the generator and bus are within safe limits, preventing mechanical stress and electrical surges.

As a Speed and Phase Matching (SPM) unit, the 9907-028 aligns the temporal relationship of the sine waves between the generator and bus. Known for its durability in extreme environments, it features an analog architecture preferred for its reliability in legacy systems and immunity to digital software complexities.

Detailed Technical Specifications

Specification Details
Model Number 9907-028
Series SPM-A (Synchronizer Package – Analog)
Input Voltage Range Dual-tap 115/230 VAC RMS (Configurable)
System Frequency 50/60 Hz Compatibility
Phase Angle Window Fixed/Adjustable to ±10° for breaker closure
Voltage Matching Capability None (Focus on speed and phase only)
Power Consumption ≤5 W (Ultra-low efficiency)
Operating Temperature -45°C to +70°C (-49°F to +158°F)
Chassis Dimensions 273.6 mm x 214.1 mm x 59.2 mm 
Physical Weight 1.71 kg

Application Scenarios

The 9907-028 is widely used in standby power plants, marine auxiliary power systems, and industrial microgrids. It is the preferred choice for paralleling diesel or gas engines in systems where simple, robust, and fast phase-matching is needed without integrated voltage regulation.

Engineering FAQ

Does this unit adjust the generator's voltage?

No, the 9907-028 only matches phase and speed. For automatic voltage matching (AVM), a different SPM-A variant or a digital SPM-D unit is needed.

Can the phase angle window be adjusted tighter than 10 degrees?

The nominal window is ±10°, but internal potentiometers allow fine-tuning to match the response time of your specific circuit breaker for seamless contact closure.