Product Introduction

The WOODWARD 9907-028 is a high-performance SPM-A (Speed Position Matcher) Synchronizer designed for precise automatic synchronization of generators to a bus. As part of the Revision F series, this unit provides advanced control logic to monitor the frequency, phase angle, and voltage of an incoming generator, ensuring a seamless and safe closure of the circuit breaker. It is a critical component for power management systems requiring high reliability and rapid synchronization.

Technical Specifications & Datasheet

The following parameters define the operational limits and hardware characteristics of the WOODWARD 9907-028 Synchronizer:

• Model Number: 9907-028
• Revision: F
• Input Voltage (Generator/Bus): 115 or 230 Vac (switch selectable)
• Operating Frequency: 50 Hz or 60 Hz
• Phase Angle Limit: Adjustable from 5° to 15°
• Voltage Matching: Typically within 1% to 10% of bus voltage
• Output Signal: Analog bias signal for speed governors
• Contact Rating: 2.0 A at 28 Vdc or 115 Vac
• Operating Temperature: -40°C to +70°C
• Power Consumption: Approximately 10 Watts

 

Technical Description

The SPM-A utilizes solid-state circuitry to compare the phase and frequency of the “oncoming” generator with the “running” bus. It generates a proportional correction signal sent to the engine governor to adjust the prime mover’s speed. Unlike basic synchronizers, the Rev F version includes enhanced filtering to handle “noisy” electrical environments, ensuring that the breaker closure command occurs exactly at the point of zero phase difference.

 

Application Fields

This synchronizer is widely utilized in industrial and marine power generation environments, including:

• Emergency Standby Power: Ensuring backup generators clip onto the grid without power surges.
• Marine Vessels: Synchronizing multiple diesel-electric propulsion engines.
• Cogeneration Plants: Managing the interface between local turbines and the utility grid.
• Peak Shaving Operations: Automated synchronization for load-sharing applications.

 

Country of Origin

The WOODWARD 9907-028 is proudly manufactured in the United States of America (USA), adhering to strict aerospace and industrial quality standards.

 

Product Usage Instructions

1. Installation: Mount the unit in a dry, vibration-resistant environment within the control cabinet.
2. Wiring: Connect the generator and bus potential transformers (PTs) to the designated AC input terminals. Ensure the speed bias output is correctly phased with the governor input.
3. Calibration: Use the onboard potentiometers to set the desired “Window” for phase angle and the “Dwell Time” for stability verification before the breaker close signal is sent.
4. Testing: Perform a “Check Synchronizer” test by monitoring the LED indicators or a synchroscope to verify the unit tracks the generator’s approach to the bus frequency before enabling the breaker trip relay.