Description
Woodward’s 9900-432 is a forward-acting 110V load sharing and speed control designed to provide precise speed regulation and active power load sharing for diesel, gas, and steam turbine-driven or engine-driven generator sets. It governs prime mover speed while coordinating load distribution across multiple parallel-running units, ensuring stable and reliable power grid synchronization.
📊 Technical Specifications & Datasheet Parameters
• Brand: Woodward
• Model: 9900-432
• Series: Load Sharing and Speed Control
• Product Name: Forward-Acting Speed and Load Controller
• Place of Origin: United States
• Operational Status: Active / Industrial Grade
• Dimensions: Approximately 200 mm × 150 mm × 80 mm (7.9 in × 5.9 in × 3.1 in)
• Weight: Approximately 1.5 kg (3.3 lbs)
• Country of Origin: United States
• Power Consumption / Power: 110 V AC control power supply (Max 30 W)
⚙️ Operation Standards & Usage Methods
Installation must strictly adhere to the manufacturer’s technical manual and be executed by qualified control system technicians. The unit should be securely mounted inside a protective NEMA/IP-rated industrial cabinet to shield internal circuitry from ambient moisture, corrosive elements, and high vibration levels. All control wiring, actuator connections, magnetic pickup (MPU) speed sensors, and AC voltage/current sensing leads must be shielded and properly grounded to eliminate electromagnetic interference (EMI). Verify all switch settings, forward-acting response characteristics, and gain adjustments before powering on the control loop.
🔌 Power-Up & Power-Down Sequence
Power-Up Sequence:
- Inspect all external wiring, actuator links, speed sensing probes, and terminal block connections to ensure secure termination.
- Apply the 110 V AC control power supply to the unit.
- Monitor internal indicator LEDs to confirm successful startup and self-diagnostics.
- Check input signal responses to ensure proper operation before enabling prime mover fuel flow.
Power-Down Sequence:
- Unload the prime mover safely and bring the engine or turbine to a complete stop.
- Disengage any external actuator control signals and lock out fuel or steam delivery systems.
- Remove the 110 V AC control power supply from the unit.
- Allow internal components to de-energize completely before performing wiring or maintenance tasks.
❓ Frequently Asked Questions (Q&A)
Q: What does “forward-acting” mean for this control unit?
A: A forward-acting control configuration means that an increase in the input error signal results in an increased output signal to the fuel or steam actuator, which is standard for governing systems where rising speed commands greater valve opening.
Q: Can this unit operate with a 110V power supply?
A: Yes, the Model 9900-432 is specifically engineered to accept a 110 V AC input power supply for control and monitoring circuitry.
Q: How does load sharing function across multiple generators?
A: The controller interfaces with inter-unit tie lines to compare load signals, allowing parallel generators to share active electrical load proportionally and prevent circulating currents or power imbalances.
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