9905-002 | Woodward SPM-A | Phase-Locked Loop Synchronizer

Product Description

Precision Automatic Synchronization for Generator Sets

The Woodward 9905-002 is a high-performance SPM-A (Speed and Phase Matching) Synchronizer designed to automate the process of paralleling a generator with a utility bus or another generator. This module utilizes a sophisticated Phase-Locked Loop (PLL) architecture to continuously monitor the frequency, phase angle, and voltage of the incoming generator relative to the bus. By providing correction signals to the engine governor and voltage regulator, the 9905-002 ensures that the breaker closure occurs only when both sources are perfectly synchronized, preventing mechanical stress and electrical transients.

Advanced Phase Matching and Voltage Regulation

A critical feature of the 9905-002 is its ability to maintain a phase angle matching tolerance within ±10 degrees. The module is engineered for versatility, supporting both 115 VAC and 230 VAC RMS sensing inputs at 50/60 Hz. Once all synchronization parameters—including a voltage differential of less than 1%—are met, the unit issues a discrete automatic closure signal to the circuit breaker. This level of precision makes it an industry standard for standby power systems, data centers, and marine propulsion where rapid and safe synchronization is required.

Detailed Technical Specifications

The following table outlines the operational and electrical parameters for the 9905-002.