Woodward 9907-028 9907-029 Synchronizer Control

The Woodward 9907-028 9907-029 Synchronizer Control is a high-precision engine synchronization system designed for critical power generation and industrial applications. It supports a speed range of 0–40,000 RPM with an accuracy of ±0.1% of reading, ensuring precise alignment of generator or engine speeds. Equipped with two independent input channels for magnetic or VRS sensors, the unit provides output signals via 4–20 mA and RS-485 Modbus for seamless integration into control networks. With a rapid response time of less than 2 ms for a 90% step change, and SIL 3 certification to IEC 61508, it meets stringent safety requirements. Built for harsh environments, the 9907-028 9907-029 offers vibration resistance up to 20 g (IEC 60068-2-6) and operates reliably between –40 °C and +85 °C.The 9907‑028 9907-029 is widely used in industrial power generation installations, utility interconnections, and multi‑genset power systems where smooth, reliable synchronization is required.

Model: 9907-028 9907-029
Type: Speed & Phase Matching Synchronizer (SPM‑A)
Input Voltage: 115 V / 230 V AC RMS ±10 %
Frequency: 50 Hz / 60 Hz
Phase Angle Window: ±10 degrees
Voltage Matching: Not included (speed/phase only)
Voltage Tolerance: ±10 %
Power Consumption: ≤ 5 W
Operating Temperature: –45 °C to +70 °C
Optimal Operating Temperature: +10 °C to +30 °C
Modes: OFF, RUN, CHECK, PERMISSIVE (via external switch)
Outputs: Relay outputs for breaker close and synchronizer control signals (high/low impedance or EPG selectable)
Speed Range: 0-40,000 RPM
Accuracy: ±0.1% of reading
Input Channels: 2 independent (magnetic/VRS)

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Q1: What role does the Woodward 9907-028 9907-029 play in a power generation setup?
A1: The 9907-028 acts as an automated synchronizer, precisely matching the output of an incoming generator to the live bus bars to facilitate a safe, disturbance-free parallel connection.
Q2: What are the acceptable voltage input limits for the 9907-028 unit?
A2: This specific 9907-028 hardware is rated to monitor and process alternating current (AC) line-to-line voltages anywhere between a minimum of 80V and a maximum of 300V.
Q3: Is the 9907-028 9907-029 compatible with different types of control power sources?
A3: Yes, the 9907-028 provides flexible installation options by supporting power from a 24V DC battery system or via selectable 115V/230V AC mains.
Q4: In what way does the 9907-028 trigger the actual breaker closure?
A4: The 9907-028 uses heavy-duty internal relay logic to complete the closing circuit of the breaker only after the synchronization window has been successfully achieved.
Q5: How does the 9907-028 protect the system from the risks of poor synchronization?
A5: To prevent mechanical and electrical damage, the 9907-028 real-time analyzes the frequency, voltage magnitude, and phase relationship, blocking any closure attempt until the two sources are in perfect alignment.

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• Automated Grid Synchronization:The 9907-028 9907-029 serves as a high-precision bridge between a standby generator and the utility bus, continuously monitoring phase angles and frequency offsets to ensure a perfect electrical match before connection.
• Intelligent Breaker Management:Once the synchronization window is perfectly aligned, the 9907-028 executes a rapid closure command, eliminating the risk of "out-of-phase" paralleling that can cause catastrophic mechanical stress to the prime mover.
• Versatile Logic Modes:Engineers can toggle the 9907-028 9907-029 between specialized modes like "Permissive" and "Check," allowing the unit to act as either a primary automatic synchronizer or a secondary safety monitor for manual operations.
• Global Power Grid Flexibility:Designed to handle a variety of international standards, the 9907-028 supports both 115V and 230V AC configurations, making it a "go-to" component for global industrial power projects.
• Hardened Electrical Protection:Built to withstand the electrical noise and thermal spikes found in heavy-duty switchgear cabinets, the 9907-028 9907-029 maintains its timing accuracy even in the most demanding industrial environments.

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