The Woodward 9907-838 is a robust load sharing module designed to manage and distribute real power (kW) across multiple generator sets operating in parallel. By providing precise bias signals to the engine speed control, this unit ensures that each prime mover carries an equitable portion of the total system load. This functionality is essential for maintaining grid stability, preventing circulating currents between paralleled units, and enhancing the overall longevity of the mechanical drive train in power generation applications.
Features
Supports both isochronous and droop load-sharing modes for versatile grid integration.
High-speed analog circuitry ensures rapid response to load transients.
Optical isolation provides superior protection against electromagnetic interference (EMI) in harsh industrial environments.
Ruggedized design optimized for high-vibration installations, such as offshore platforms and heavy-duty mining power plants.
Low thermal dissipation profile, suitable for high-density control cabinet configurations.
Technical Specifications
Model
9907-838
Brand
Woodward
Input Voltage (Sensing)
115/230 VAC
Signal Output
0 to 3 VDC or +/- 3 VDC (configurable)
Power Consumption
5 W maximum
Operating Temperature
-40 to 70 deg C
Weight
1.36 kg
Installation Guidelines
Ensure the module is installed in a clean, dry environment within a NEMA or IP-rated enclosure to prevent moisture and dust ingress.
Use shielded twisted-pair cabling for all signal connections to maintain signal integrity and minimize noise pickup.
Verify that the control power supply is stable and within the specified range before energizing the module.
Maintain adequate clearance around the module to allow for natural convection cooling, despite the low thermal output.
Always disconnect power before performing any wiring changes or module replacement to prevent electrical damage.
Ensure proper chassis grounding to the cabinet backplane to mitigate EMI issues.
FAQ
Q: Can the 9907-838 be used in both isochronous and droop modes? A: Yes, the module is designed to support both isochronous and droop load-sharing configurations, providing flexibility for various grid synchronization requirements.
Q: Is this module suitable for offshore environments? A: Yes, the 9907-838 features a ruggedized construction specifically intended for high-vibration environments, including offshore oil and gas platforms and mining operations.
Q: What is the primary purpose of the bias signal output? A: The bias signal is sent to the engine speed control to adjust the throttle or fuel position, ensuring that the generator output matches the load line of other units in the parallel system.
