Description

WOODWARD  9907-162  high-performance digital governor

Function
Speed control function: Advanced control algorithms are adopted to maintain a stable speed of the equipment and meet the load requirements. The rotational speed setting value can be changed through direct input on the panel, the panel’s acceleration/deceleration keys, external acceleration/deceleration input contacts, or a 4-20mA remote control signal, etc.
Power control function: It can adjust the output power of the equipment according to the load changes, enabling the equipment to operate efficiently under different load conditions and ensuring the power balance of the system.
Pressure control function: It can control the internal pressure of the equipment, for example, to control the steam pressure in industrial boilers, ensuring the safe operation of the equipment and meeting the pressure requirements of the production process.
Multiple protection functions: Equipped with overspeed, overvoltage, over-temperature and other protection functions. When the operating parameters of the equipment exceed the set safety threshold, the governor will promptly take measures, such as triggering the tripping mechanism, to ensure the safety of the equipment and prevent it from being damaged due to abnormal working conditions.

Flexible configuration function: Supports multiple control modes and parameter configurations, can adapt to different application scenarios and equipment requirements, and can be personalized Settings according to specific industrial needs.
Friendly human-machine interface: It provides an intuitive user interface, facilitating operation and maintenance by operators, and reducing operation difficulty and maintenance costs.
Powerful communication function: Supports multiple communication protocols such as MODBUS and PROFIBUS, and can communicate with upper computers, PLCS and other devices to achieve remote monitoring and data transmission, facilitating system integration and centralized management.

Technical parameters
Power supply parameters: Available power supplies are 18-32Vdc, 88-132Vdc, 90-150Vdc, and 180-264Vdc.
Output signal: There are 8 switch quantity (relay) outputs, among which 6 are programmable. Six programmable 4-20mA analog outputs.
Communication interface: Supports communication protocols such as MODBUS and PROFIBUS, and also supports hardware interfaces such as RS-232, RS-422 and RS-485.
Display mode: Two lines of 24-character LED display are adopted.
Operating temperature: The working temperature range is -20 ℃ to +60℃.
Storage temperature: The storage temperature range is -40 ℃ to +85℃.
Humidity range: 5% to 95% non-condensing.
Dimensions: Approximately 11in×14in×4in (279.4mm×355.6mm×101.6mm).
Weight: Approximately 1.2kg.
Control functions: It can achieve functions such as speed/frequency control, suction/intake main pipe pressure control, steam turbine or generator load control/limitation, steam turbine intake main pipe pressure control/limitation, and steam turbine exhaust main pipe pressure control/limitation.
Other parameters: Comply with the humidity standard of Lloyd’s Env2 test #1 and the dry heat standard of Env3. The impact performance meets the requirements of the US military standard MIL-STD-810C, Method 516.2-1, Procedure 1b.

Application case:
Power plant steam turbine unit control: It can be used to control steam turbine generator sets, achieving precise control of the turbine’s speed, power and pressure, ensuring the efficient power generation of the generator sets and maintaining the stability of the power grid frequency.
Steam pressure control in industrial boilers: In industrial boilers, it can effectively control the steam pressure to meet the requirements of the production process for steam pressure, ensure the safe and stable operation of the boiler, and provide a stable steam supply for subsequent production links.

Petrochemical equipment drive: In the petrochemical production process, it can be used to drive compressors, pumps and other equipment. According to the requirements of the production process, precisely adjust the rotational speed of the equipment to ensure the stability of material transportation and process reactions, and improve production efficiency and product quality.
The speed regulation system of the steam turbine unit of a certain device: The speed regulation system of the steam turbine unit of a certain device adopts the WOODWARD 9907-162 type governor, which was put into use in 2003. The speed measurement probes are two JAQUET DSE series passive reluctance sensors. This governor accepts the high-frequency pulse signal from the rotational speed sensor for rotational speed control, overspeed protection, etc., and converts the signal into 4-20mA for remote transmission to the DCS system and the local tachometer.