WOODWARD 9907-165 Digital Speed Control
Product Description
The Woodward 9907-165 is a 723PLUS high-performance digital speed controller (Digital Speed Control).
It is a fully digital control device based on a microprocessor, specifically designed for reciprocating engines (diesel, natural gas or dual fuel) as well as turbines.
This controller can provide precise speed control, load distribution, and serial communication capabilities with modern industrial automation systems, and is the core component of the prime mover control system.
2. Technical Data Sheet
Model: 9907-165
Input Power (Power Supply): High Voltage version, supporting 90–150 Vdc.
Speed Sensing Input: 2 magnetic pick-up devices (MPUs) or proximity switch inputs.
Analog Inputs: 4 channels (4–20 mA or 0–5 Vdc), used for load sensors, remote speed settings, etc.
Analog Output (Analog Outputs): 3 channels (4–20 mA), used to drive actuators or for remote display.
Discrete Input/Output (Discrete I/O): 8 channels of discrete input, 3 channels of relay output (discrete output).
Communication Port (Communication): 2 serial ports (RS-232. RS-422. RS-485), supporting Modbus protocol.
Operating Temperature: -40 °C to +70 °C.
Certifications: CSA certification, compliant with CE standards.
3. Related Models / Components
9907-018: Handheld Programmer, used for parameter settings.
9906-619 / 9906-700: The low-voltage version of 723PLUS (18–40 Vdc).
8200-226: ProAct actuator (often used in conjunction with 723PLUS).
Watch Window: A software tool used for debugging and monitoring on the PC side.
4. Application Cases (Application Examples)
Generator Load Sharing: This is used for the parallel operation of multiple engines to ensure a proportional balance of the load.
Marine Propulsion System: Controls the rotational speed and fuel limits of the main propulsion engine, and is capable of handling complex load variations.
Gas Compressor: Maintains the constant rotational speed of the reciprocating compressor.
Dual Fuel Engines: Precisely adjust the fuel ratio to ensure the engine’s efficiency in different fuel modes.
5. Product Advantages and Features (Product Advantages and Features)
Full digital precise control: Compared to analog systems, it eliminates zero drift and provides higher precision PID regulation.
Multiple communication protocols: The flexible serial communication enables seamless integration with distributed control systems (DCS) or PLCs.
Powerful filtering function: Built-in flexible torsional vibration filtering algorithm to protect the transmission system from mechanical stress damage.
Extremely adaptable to the environment: With a wide operating temperature range and a vibration-resistant design (installed in the cabinet), it is suitable for harsh industrial and marine environments.
Flexible configuration: Through the software configuration in the form of a logic block diagram, it can adapt to different control strategies (such as sag control, isochronous control, etc.).
6. Other Models in the Series
The Woodward 723PLUS series is divided into multiple sub-models based on the input voltage and specific functions:
9907-162: Low-pressure version 723PLUS.
9907-164: A version with special interlocking functions.
9905 Series (Legacy 723): The predecessor product of 723PLUS (the older 723 digital control).
DSLC-2: Woodward’s digital synchronization and load controller for power station management, often used in conjunction with 723PLUS to achieve automatic grid connection.
