WOODWARD 9907-027 Load Sharing Module

Product Details

9907-027 Product Description

The WOODWARD 9907-027 is a precision-engineered load sharing module designed for seamless integration within the WOODWARD 9900 Series generator control architecture. As a critical component in multi-generator paralleling systems, the 9907-027 ensures balanced real power distribution across all paralleled generating sets, maintaining system stability, frequency consistency, and operational reliability in demanding industrial power environments. Whether deployed in island-mode microgrids, utility-parallel configurations, or standby power systems, this module delivers the signal fidelity and control authority required for mission-critical power generation infrastructure.

Engineered for long-term field deployment, the 9907-027 integrates directly with the WOODWARD 9900 Series governor and control platform, enabling synchronized load sharing without external signal conditioning. Its architecture supports both isochronous and droop control modes, giving system engineers the flexibility to configure power distribution strategies that match the operational demands of the installation. The module's robust analog signal interface ensures compatibility with existing 9900 Series wiring harnesses, reducing commissioning time and minimizing integration risk during system upgrades or panel replacements.

In multi-unit power plants, the 9907-027 acts as the communication backbone between individual generator control loops, transmitting real-time load reference signals that allow each governor to adjust fuel delivery in proportion to the shared load demand. This closed-loop sharing architecture eliminates hunting, reduces wear on prime movers, and extends the operational lifespan of the entire generating fleet. The module is fully compatible with WOODWARD 2301A, 2301D, and EG3P governor controllers, as well as the 9905-292 and 9905-458 power supply modules commonly used in 9900 Series panel assemblies.

The 9907-027 Sharing Module is most effective when deployed as part of a fully coordinated WOODWARD 9900 Series control platform. In a typical multi-generator installation, the module interfaces with the WOODWARD 2301A Load Sharing and Speed Control unit on each generating set, receiving and transmitting the isochronous load reference signal that governs real power distribution. The WOODWARD 2301D Digital Load Sharing Controller provides enhanced digital processing for installations requiring higher precision or remote diagnostics capability.

Power integrity for the sharing module and associated control electronics is maintained by the WOODWARD 9905-292 Power Supply Module, which conditions incoming DC bus voltage to the stable 24 VDC rail required by the 9900 Series backplane. In redundant power configurations, the 9905-458 Redundant Power Supply provides automatic failover, ensuring the sharing bus remains active even during primary PSU maintenance or failure events.

At the I/O layer, the WOODWARD 9907-180 Analog Input Module captures generator speed, voltage, and frequency feedback signals, feeding real-time data into the sharing calculation loop managed by the 9907-027. For installations requiring expanded I/O capacity, the 9907-205 Digital I/O Expansion Module adds discrete input and output channels for breaker status, synchronization permissives, and alarm relay outputs without requiring additional control panel space.

Communication between the generator control system and the plant SCADA or DCS layer is handled by the WOODWARD easYgen-3000 Series Generator Management System, which aggregates load sharing data, event logs, and protection status from multiple 9900 Series panels into a unified supervisory interface. For installations using Modbus RTU or Modbus TCP protocols, the WOODWARD 5464-839 Communication Gateway bridges the analog sharing bus to the digital plant network, enabling remote monitoring and load dispatch commands from the control room.

At the HMI layer, the WOODWARD 8273-1001 Operator Panel provides local visualization of load sharing status, governor setpoints, and alarm conditions, reducing the need for laptop-based commissioning tools during routine maintenance. For protection coordination, the WOODWARD ProTech-GII Overspeed Protection System operates in parallel with the sharing module, providing independent overspeed trip authority that cannot be overridden by the load sharing control loop — a critical safety layer in high-inertia prime mover applications.

Power Generation & Utilities: The 9907-027 is the standard load sharing solution for diesel generator sets, gas turbine auxiliaries, and combined heat-and-power (CHP) installations operating in parallel with utility grids or in island-mode microgrids. Utilities and independent power producers rely on the 9900 Series sharing architecture to maintain frequency stability during load transients, generator switching events, and planned maintenance outages.

Oil & Gas / Petrochemical: Offshore platforms, LNG terminals, and onshore processing facilities use the 9907-027 in multi-generator power management systems where load sharing accuracy directly impacts process stability. The module's wide operating temperature range and vibration-tolerant construction make it suitable for harsh marine and industrial environments where standard commercial control hardware would fail prematurely.

Mining & Metallurgy: Remote mine sites and smelting operations with captive power plants depend on the 9907-027 to balance load across multiple generator sets serving variable-speed drives, hoists, crushers, and ventilation systems. The isochronous sharing mode prevents frequency droop during sudden load application — a common failure mode in mines with large motor starting events.

Marine & Shipbuilding: Classification-society-approved power management systems on vessels, FPSOs, and offshore support vessels incorporate the 9907-027 as the load sharing backbone for diesel-electric propulsion and hotel load management. The module's compatibility with WOODWARD governor controllers certified for marine applications simplifies class approval documentation during new build and retrofit projects.

Water & Wastewater Treatment: Pumping stations and treatment plants with standby generator systems use the 9907-027 to ensure seamless load transfer and parallel operation during grid outages, protecting critical process equipment from power interruption and frequency instability.

Q1: Is the WOODWARD 9907-027 compatible with both 2301A and 2301D governor controllers in the same paralleling system? Yes. The 9907-027 sharing bus operates on a standardized analog signal protocol common to all WOODWARD 9900 Series-compatible governors, including the 2301A and 2301D. Mixed-governor installations are supported provided all units are configured for the same sharing mode (isochronous or droop) and the sharing bus termination resistors are correctly installed at each end of the sharing line. WOODWARD application engineers recommend verifying gain and droop settings across all units during commissioning to ensure stable load distribution.

Q2: What is the recommended maintenance interval for the 9907-027, and does NANKMOS provide long-term spare parts support? WOODWARD recommends functional testing of the sharing module every 12–24 months as part of scheduled generator maintenance, including signal level verification, terminal torque checks, and sharing bus continuity testing. NANKMOS maintains stock of the 9907-027 and associated 9900 Series components to support long-term spare parts requirements. All units supplied by NANKMOS are covered by a 12-Month Warranty from the date of shipment, with pre-shipment functional testing performed on every unit before dispatch.

Q3: Can the 9907-027 be retrofitted into an existing 9900 Series panel without replacing the governor controllers? Yes. The 9907-027 is a drop-in replacement for earlier WOODWARD sharing modules used in 9900 Series panels. Retrofitting requires only the sharing bus wiring connections and DC power supply terminals — no governor controller replacement is necessary. NANKMOS recommends reviewing the existing panel wiring diagram against WOODWARD Application Note 26184 before installation to confirm terminal assignments and sharing bus polarity, particularly in panels that have been modified from the original factory configuration.