Description
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- Model Designation: WOODWARD 9907-005
- Control Type: Reverse Acting (Speed Control and Load Sharing)
- Input Voltage: 18–40 VDC (24 VDC Nominal)
- Speed Range: 500 Hz to 15,000 Hz
- Magnetic Pickup (MPU): 1.0 to 30 Vrms
- Load Sharing: 0–6 VDC (Proportional to Load)
- Actuator Current: 0–200 mA (Standard Output)
- Operating Temperature: -40°C to +85°C (-40°F to +185°F)
- Idle Speed Adjustment: 25% to 100% of Rated Speed
- Enclosure: NEMA 1 Aluminum Chassis
The Woodward 9907-005 is a 2301A series electronic control designed to provide precise speed regulation and proportional load sharing for diesel or gas engines and turbines. As a reverse-acting model, it is specifically configured to decrease its actuator output signal when the sensed speed increases or the power is lost, serving as a critical component in systems where mechanical fail-safe positions require a reduction in fuel. It is engineered for paralleled generator sets, allowing multiple units to balance kilowatts effectively across a common bus.
Distinctions from Similar Models
- Action Logic: Unlike the 9907-018 (Forward Acting), the 9907-005 is Reverse Acting, meaning its output decreases as speed increases, which is necessary for specific actuator and linkage configurations.
- Input Power: This model is designed for low-voltage DC operation (18–40 VDC), distinguishing it from the 9905-series variants that are built for 115/230 VAC high-voltage inputs.
- High-Speed Sensing: It features an expanded frequency range (up to 15,000 Hz) compared to legacy 2301 models, providing better compatibility with high-tooth-count flywheels and high-speed turbine rotors.
Product Operation Guidelines
- Fail-Safe Verification: Confirm that the engine’s fuel system is designed for reverse action; incorrect pairing of a reverse-acting control with a forward-acting actuator can lead to overspeed conditions.
- Shielding for MPU: Use shielded twisted-pair wiring for the Magnetic Pickup (MPU) signal; the shield must be grounded at the control end only to prevent electrical noise from causing speed instability.
- Load Sharing Lines: When paralleling generators, ensure the load sharing lines (0–6 VDC) are connected with identical polarity across all 2301A units to ensure stable load distribution.
- Gain and Stability Tuning: Adjust the “Gain” and “Stability” potentiometers while the engine is under load to eliminate hunting; small incremental turns are recommended as the 2301A circuitry is highly sensitive to adjustments.
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