Description
- The WOODWARD 9905-007 is a high-reliability electronic control module from the 2301A series, designed for precise speed regulation and load sharing of industrial engines and turbines. This module is engineered to coordinate multiple parallel generator sets, ensuring proportional and balanced load distribution across the system. Operating on a rugged analog platform, the 9905-007 delivers high-speed, deterministic actuator control to maintain stable grid frequency under erratic load variations. Its specialized circuitry supports both isochronous (constant speed) and droop operations, making it a critical asset in marine, power generation, and oil and gas infrastructure.
Product Parameters
- Brand: Woodward
- Model Number: 9905-007
- Series: 2301A Speed Control
- Action Type: Reverse-Acting (Decreases current to increase fuel/power)
- Input Voltage: 90–150 VDC or 88–132 VAC (High Voltage Model)
- Speed Sensing Frequency: 500 Hz to 15,000 Hz (via Magnetic Pickup)
- Actuator Output Signal: 0–200 mA
- Load Sharing Capacity: Isochronous parallel load sharing within ±5%
- Enclosure Rating: IP20 / Chassis Mount
- Operating Temperature: -40°C to +70°C
This governor control module interfaces directly with industrial actuators and magnetic pickups to form a closed-loop governing circuit, translating speed deviations into rapid correctional responses.
Comparison with Similar Models
The 9905-007 is distinguished by its configuration as a High Voltage, Reverse-Acting module within the 2301A lineup. This sets it apart from low-voltage models like the 8272-720 (which operates on 18–40 VDC) and forward-acting models. In a reverse-acting system, a loss of control signal causes the actuator to move to maximum fuel, making it specific to systems utilizing mechanical fail-safe backups or reverse-acting actuators. Compared to the digital 2301D controls, the 9905-007 relies entirely on hardware potentiometers for tuning, providing zero-latency analog loops and immune operation against digital firmware vulnerabilities.
Operation Tips
- Reverse-Action Verification: Confirm that your actuator and mechanical linkage are explicitly designed for reverse-acting operation before powering the module to prevent overspeed conditions during commissioning.
- MPU Installation: Set the gap between the Magnetic Pickup (MPU) and the flywheel gear to yield a minimum of 1.5 Vrms during engine cranking; a weak speed signal will prevent the governor from regulating properly.
- Wiring Shielding: Route all MPU and load-sharing line connections using shielded twisted-pair cables, grounding the shield only at the control chassis end to minimize electromagnetic interference.
- Potentiometer Calibration: Adjust the “Ramp Time” and “Gain” pots gradually during a warm engine state. Use insulated electronics tools to prevent shorting nearby surface analog tracks.
