The Woodward 9907-252 is an advanced Load Sharing Module engineered to ensure reliable, precise power and load distribution among multiple parallel-operated generators. Designed to support both isochronous and droop load-sharing modes, it provides stable operation across various prime movers—including diesel, gas, gasoline, and steam turbines—making it an essential component for complex industrial power management systems.

Technical Datasheet & Parameters

Initial Operation Checklist

• ⚡ Verify that the auxiliary DC power supply is stable and maintained within the 18 to 32 VDC range with correct polarity on input terminals prior to energizing.
• 🔧 Check that potential transformer (PT) inputs (95–130 VAC) and current transformer (CT) secondary inputs (3–7 A RMS) are wired securely to match system ratings.
• ⚙️ Confirm that front-panel potentiometer adjustments (such as Droop and Load Gain) are properly tuned to match the dynamic response of the generator set.
• 🔌 Verify that shielding on control and signal wiring is correctly terminated to prevent electromagnetic interference (EMI).

Routine Maintenance & Upkeep

• 👁️ Perform routine visual checks on front-panel terminal connections and potentiometers to ensure they remain clean and free from environmental contamination.
• 🔍 Inspect signal wiring harnesses and shielded cables periodically for physical wear, fraying, or degradation.
• 🔩 Ensure that mounting hardware and terminal block screws remain firmly tightened to withstand continuous plant vibration.
• 🧹 Keep the surrounding control cabinet clean, dry, and adequately ventilated to ensure ambient temperatures remain within the -40°C to +70°C operational limit.

Troubleshooting & Common Issues

• ⚠️ Module Fails to Power Up: Check 24 VDC supply voltage stability, input terminal polarity, and external power fuse integrity.
• 🔌 Load Imbalance Among Paralleled Units: Inspect CT and PT signal wiring continuity, verify load gain potentiometer calibration, and check interconnecting load-sharing lines.
• ⚙️ Hunting or Speed Instability: Re-evaluate droop and gain settings, and check for unstable speed reference signals or governor actuator responses.
• 🔥 External Interference / Erratic Behavior: Ensure proper shielding integrity and grounding practices are followed to minimize high-frequency noise or RFI.

Safety Precautions

• 🛑 Always disconnect and lock out external power and prime mover sources before executing physical wiring, installation, or maintenance tasks.
• 👷 Installation, configuration, and calibration must be performed strictly by qualified instrumentation technicians familiar with turbine and generator control systems.
• ⚡ Never open current transformer (CT) secondary circuits while the system is energized to avoid dangerous open-circuit high voltages.
• 🚫 Ensure that an independent, failsafe overspeed shutdown device is installed to protect against prime mover runaway conditions.

Frequently Asked Questions (Q&A)

💬 Q1: What is the primary function of the Woodward 9907-252 module?

💡 A1: It manages and distributes active load efficiently among multiple parallel-running generators, supporting both isochronous and droop modes.

💬 Q2: Is this module compatible with non-Woodward engine governors?

💡 A2: Yes, the module is engineered for versatile integration, allowing load sharing across both Woodward and non-Woodward equipped engines via standard analog control interfaces.

💬 Q3: What documentation can be supplied for compliance verification?

💡 A3: Standard regulatory documentation, including the Certificate of Origin (COO) and Certificate of Conformance (COC), can be provided upon request.

Recommended Alternative Woodward Series Models

• 📌 Woodward 9907-162 (Load Sharing and Speed Control Module)
• 📌 Woodward 9907-164 (Digital Load Sharing Governor Module)
• 📌 Woodward 9907-166 (EGCP-1 Genset Control Package)
• 📌 Woodward 9907-167 (Analog Load Sharing Module)
• 📌 Woodward 8440-1884 (easYgen-2500 Genset Controller)
• 📌 Woodward 8440-2001 (easYgen-3200 Advanced Genset Controller)
• 📌 Woodward SPM-A Synchronizer Module
• 📌 Woodward 8200-226 (Actuator Driver / Control Module)
• 📌 Woodward 2301A Speed Control Series
• 📌 Woodward 2301D Distributed Control Governor