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9905-708 - Automatic Synchronizer Module is available in stock which ships the same day.
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SPECIFICATIONS:
Part Number: 9905-708
Manufacturer: Woodward
Series: SPM-A Series
Product Type: Automatic Synchronizer Module
Functional Group: Generator Automatic Synchronization & Paralleling
Operating Voltage: 120 V AC / 240 V AC
Operating Frequency: 50 Hz / 60 Hz
Control Interface: Relays / Discrete Speed & Voltage Adjustment Outputs
Mounting: Panel / Chassis Mount
Conformal Coating: Yes
System Compatibility: Power Generation & Generator Control Systems
Availability: In Stock
Repair Lead Time: 3–7 Days
Country of Origin: United States
The 9905-708 is an Automatic Synchronizer Module designed and manufactured by Woodward within the SPM-A synchronizer series. It provides fully automatic matching of frequency, phase angle, and voltage between a generator set and an incoming bus or utility grid prior to breaker closure. By automating the paralleling process, the module eliminates human error and mechanical stress on the prime mover, ensuring safe, seamless integration into multi-generator microgrids or main utility distribution networks.
AUTOMATIC FREQUENCY & PHASE MATCHING:
The module continuously senses incoming generator AC bus potential and utility bus potential, comparing frequency and phase angle relationships in real time. It issues speed-matching Correction signals directly to the prime mover governor CPU or speed control loop, dynamically driving the generator speed until exact phase coincidence and zero frequency differential are achieved.
VOLTAGE MATCHING & BREAKER CLOSING LOGIC:
In addition to frequency alignment, the 9905-708 evaluates differential voltage potential across the circuit breaker. If voltage mismatch exceeds programmed limits, the unit sends raise/lower trim signals to the Automatic Voltage Regulator (AVR). Once phase, frequency, and voltage conditions fall within safe synchronization windows, the module energizes its internal breaker closure relay to safely tie the generator to the bus without cross-current transients.
FAULT MONITORING & PARALLELING PROTECTION:
To prevent out-of-phase closure and electrical damage to generator windings, the module incorporates continuous lock-out diagnostics. The onboard circuitry monitors line power stability, phase reversal, and signal loss, blocking the breaker close command if operating parameters deviate from specified matching limits.
WHY BUY FROM WOC
World of Controls maintains the industry's largest inventory of genuine OEM replacement components exclusively for Woodward control systems and turbomachinery governors. To minimize critical plant downtime, we provide both UNUSED surplus and fully REBUILT circuit boards, field terminal modules, and driver cards—each backed by comprehensive warranty protection. Every reconditioned component, including the Woodward 9905-708, undergoes rigorous multi-point inspection, terminal continuity verification, and functional bench-testing by our experienced technical team before dispatch. In addition to direct parts supply, our facility offers complete diagnostic repair and unit exchange services with rapid turnaround times for your damaged Woodward hardware. Our dedicated team of automation specialists is available 24/7 to assist with technical selection, live stock verification, and emergency component sourcing for your control panels. Contact us today via phone or email to request pricing, confirm inventory, or arrange fast worldwide shipping.
What is Woodward 9905-708?
The Woodward 9905-708 is an Automatic Synchronizer Module from the SPM-A Series, designed to synchronize a generator with an incoming bus or utility supply before breaker closure. It monitors generator and bus frequency, phase angle, and voltage, then provides correction and breaker-closing signals when synchronization conditions are satisfied.
What parameters does the 9905-708 monitor during automatic synchronization?
The module monitors key synchronization parameters including generator frequency, bus frequency, phase relationship, and voltage differential. These parameters are evaluated continuously to determine whether the generator is within the configured synchronization window for safe breaker closure.
How does the 9905-708 perform frequency matching?
The 9905-708 compares the generator frequency with the incoming bus frequency and produces speed adjustment signals when a frequency difference exists. These signals are provided to the applicable governor or speed-control system, so generator speed can be corrected toward the required synchronization condition.
How does the module control generator voltage matching?
The module evaluates the voltage difference between the generator and the incoming bus. When voltage correction is required, raise or lower trim signals can be provided to the excitation or AVR system to bring the generator voltage within the configured synchronization limits.
Why is voltage matching unsuccessful during synchronization?
Inspect generator voltage sensing, bus voltage sensing, AVR connections, and raise/lower voltage trim circuits. If the synchronizer detects a voltage differential outside its permitted range, it may continue requesting correction or inhibit breaker closure until the voltage conditions are acceptable.
