The WOODWARD SPM-A 9905-001 Rev M is a precision electronic synchronizer designed for the automatic synchronization of generators with a bus or other generators. This high-reliability unit provides critical control for matching both the frequency and the phase angle of the incoming generator to the bus, ensuring a seamless and safe closure of the circuit breaker.

 

Product Overview

The SPM-A (Speed and Phase Matching) series is an industry standard for power management. The 9905-001 model specifically targets applications requiring automatic control of the prime mover’s speed via the governor. By comparing the bus voltage and generator voltage, the unit sends correction signals to the speed control to eliminate frequency drift and phase displacement. Revision M represents a refined hardware version optimized for stability and long-term service in industrial power plants.

Technical Datasheet & Parameters

 

Country of Origin

The WOODWARD SPM-A 9905-001 is designed and manufactured in the USA.

 

Application Fields

• Grid Parallelism: Synchronizing large diesel or gas generators to the public utility grid.
• Island Power Plants: Managing multiple generator sets in remote mining or industrial sites.
• Marine Power Systems: Parallel operation of shipboard auxiliary generators.
• Co-generation: Synchronizing steam or gas turbines in combined heat and power (CHP) facilities.
• Emergency Backup: Automatic synchronization for critical data centers and hospitals.

 

Technical Description

The 9905-001 Rev M utilizes a sophisticated analog comparison circuit that monitors the zero-crossing points of the generator and bus waveforms. It calculates the “slip frequency” and generates a bipolar DC output signal compatible with Woodward speed controls and governors. The Rev M revision features enhanced filtering to ignore harmonic distortion on the power lines, ensuring the synchronizer does not trip or provide false signals in “dirty” electrical environments. It also includes an adjustable “window” for phase and voltage matching before the closure command is issued.

 

Usage Instructions

1. Installation: Mount the unit in a vertical position within the generator control panel. Ensure it is away from high-heat components.
2. Wiring: Use shielded cables for the speed bias output to the governor. Connect the Potential Transformer (PT) secondary leads from both the bus and the generator to the appropriate input terminals.
3. Voltage Selection: Confirm the internal or rear-panel switch is set to the correct PT voltage (115V or 230V) before applying power.
4. Adjustment: Use the “Dynamics” potentiometer to adjust how quickly the unit responds to speed changes. Set the “Phase Window” to the desired tolerance for your specific circuit breaker.
5. Testing: Perform a “Dry Run” test with the breaker trip circuit disabled to verify the SPM-A is correctly driving the engine speed to match the bus.

For detailed availability and technical support regarding the WOODWARD SPM-A 9905-001, please refer to our online inventory.