Description
The Woodward 9907-162 is a high-performance 2301A Load Sharing and Speed Control unit. It is designed to manage the speed and load of diesel or gas engines, or steam and gas turbines. This specific model is a low-voltage, forward-acting variant utilized for proportional and integral control of prime movers in both single-unit and parallel operations.
Product Parameters (Datasheet)
- Model Number: 9907-162
- Series: 2301A (Standard Speed Range)
- Input Voltage: 10 to 40 VDC (24V Nominal)
- Power Consumption: Max. 15 W
- Actuator Output: 0 to 200 mA (Compatible with most Woodward magnetic actuators)
- Speed Range: 1,000 to 10,000 Hz (Magnetic Pickup frequency)
- Speed Sensing: via Magnetic Pickup (MPU)
- Control Modes: * Isochronous: For precise frequency control of a single unit.
- Droop: For parallel operation with the utility grid or other generators.
- Operating Temperature: -40°C to +85°C (-40°F to 185°F)
- Enclosure: Chassis mount (IP00)
WOODWARD 9907-162
WOODWARD 9907-162
WOODWARD 9907-162
Country of Origin
This control unit is engineered and manufactured by Woodward, Inc. in the USA, built to industrial standards for ruggedness and longevity.
Application Fields
The 9907-162 is a workhorse in heavy industry and power generation:
- Marine Propulsion: Coordinating engine speed and propeller pitch.
- Emergency Power: Governing standby diesel generators for hospitals and data centers.
- Oil & Gas: Controlling compressor drives and pump engines.
- Co-generation: Managing load sharing between multiple turbine-driven generator sets.
- Locomotives: Speed control for large-scale diesel engines.
Product Usage Instructions
- Mounting: Install the chassis in a protected control cabinet. Ensure the unit is mounted vertically to allow for adequate heat dissipation from the internal power components.
- Speed Sensing: Connect a magnetic pickup (MPU) to terminals 21 and 22. Ensure the gap between the pickup and the flywheel is adjusted to provide at least 1.5 Vrms during cranking.
- Actuator Wiring: Connect the governor actuator to terminals 23 and 24. Use twisted-pair, shielded cable to prevent electrical noise from causing hunting or instability.
- Calibration: Use the onboard potentiometers to set the “Rated Speed,” “Gain,” and “Reset” (Stability). Adjust the “Gain” until the engine becomes slightly unstable, then back it off for a crisp, stable response.
- Load Sharing: For parallel operation, connect the “Load Sharing Lines” between all 2301A units in the system. This allows the controllers to communicate the percentage of load each unit is carrying.
Product Technical Description
The 2301A series provides an analog solution to prime mover control. Technically, it uses a high-gain amplifier to compare the actual speed (from the MPU) against the setpoint speed. Any deviation results in a change in the 0–200 mA output to the actuator, which physically moves the fuel rack. The 9907-162 is forward-acting, meaning an increase in the control signal results in an increase in fuel. It features internal protection against loss of speed signal, which will automatically shut down the actuator output to prevent engine overspeed.
Q&A (Common Questions)
Q: Can I use this unit on a 120V AC power supply? A: No, the 9907-162 is a low-voltage model (10-40 VDC). For AC high-voltage applications, you would need a 9907-014 or similar high-voltage variant.
Q: What is the difference between “Isochronous” and “Droop” mode? A: Isochronous maintains a constant speed (frequency) regardless of load. Droop allows the speed to decrease slightly as load increases, which is necessary for stable load sharing when paralleled with a infinite bus (the grid).
Q: Why is my engine “hunting” (cycling speed up and down)? A: This is usually caused by the “Gain” being set too high or air trapped in the hydraulic actuator. Try reducing the Gain or adjusting the Stability (Reset) potentiometer.
Q: Is the 9907-162 compatible with a 4-20 mA actuator? A: No, this unit is designed for 0–200 mA magnetic actuators. If you have a 4-20 mA actuator, you will need a signal converter or a different controller model.
Similar Model Recommendations
- Woodward 9907-018 (High Voltage / Reverse Acting)
- Woodward 9907-164 (Low Voltage / Reverse Acting)
- Woodward 9905-020 (2301A with expanded speed range)
- Woodward 8290-184 (723 Plus Digital equivalent)
- Woodward 9907-014 (High Voltage / Forward Acting)
For technical support or to request a quote for the Woodward 9907-162, please contact our engine control specialists.
