The Woodward 9907-252, also cataloged as the 9907-252 Load Sharing Module, operates as a dedicated hardware component for proportional real power balancing and prime mover governor biasing within parallel generator system architectures.

Hardware Specifications

Actuator Loop Feedback & Harmonic Distortion Suppression

Power conversion circuitry and internal signal conditioning hardware generate operational heat conducted across the metallic baseplate. Effective thermal heat sink dissipation prevents thermal drift during continuous full-load parallel operations. The module evaluates three-phase generator current and voltage vectors to compute real power output, transmitting real-time analog bias signals to speed governors. Rapid actuator loop feedback response maintains proportional load allocation during sudden load acceptance, while integrated filter networks ensure harmonic distortion suppression against non-linear electrical loads.

Frequently Asked Questions

• Q: What cable type should be used for the analog load sharing bus connection between generators?
• A: The load sharing bus lines connecting parallel modules must use shielded twisted-pair wire with the shield terminated at a single chassis ground point to prevent noise coupling.
• Q: How should Potential Transformer (PT) and Current Transformer (CT) inputs be phased during installation?
• A: Proper voltage and current transformer phase matching is critical; incorrect CT/PT polarity causes inverse power calculations and improper load distribution.
• Q: What mounting practices ensure reliable thermal management inside control cabinets?
• A: Mount the module vertically on an unpainted metal panel or DIN rail surface, maintaining adequate surrounding clearance for passive air convection.

Field Installation Guidelines

• Mount the module securely onto a flat vertical panel inside the control enclosure using specified mounting hardware.
• Connect the central frame ground lug directly to the switchgear ground bus using a short, low-impedance grounding strap.
• Route AC voltage sensing, current transformer inputs, and governor bias lines in separate grounded wiring ducts away from high-power distribution lines.
• Verify power supply input voltage and CT shorting terminal status prior to energizing generator bus lines.