Description
The WOODWARD 8701 - 758 is a digital speed governor that can be used to control steam turbines.
- Startup Sequence and Temperature Input: It has an automatic startup sequence for both hot and cold starts, with a temperature input option, enabling corresponding control according to different startup conditions.
- Critical Speed Avoidance: It can achieve the function of critical speed avoidance within the three-speed range, preventing problems such as resonance during the operation of the steam turbine and ensuring the safe and stable operation of the equipment.
- Alarm and Trip Indication: It has ten external alarm inputs, which can be connected to external sensors or devices to monitor various operating parameters in real-time. When an abnormal situation occurs, it can provide trip indication through trip and alarm events with relevant RTC timestamps, facilitating operators to promptly detect problems and take measures.
- Speed and Load Control: It has dual speed and load dynamic functions, which can accurately control the speed and load of the steam turbine according to the actual operating situation, ensuring stable operation under different working conditions. At the same time, it also has a zero-speed detection function, which can accurately determine whether the steam turbine is in a stopped state. In addition, it supports remote droop and frequency deadband functions, which can be flexibly configured according to specific application scenarios.
- Operation Modes: It provides three normal operation modes, including the configuration mode, operation mode, and calibration mode. In the configuration mode, various parameters of the speed governor can be set and adjusted; in the operation mode, real-time control of the steam turbine can be achieved; in the calibration mode, relevant sensors and control parameters can be calibrated to ensure the accuracy and reliability of the speed governor.
- Input and Output Interfaces: It includes two redundant speed inputs, which can accept signals from magnetic pickup devices, eddy current probes, or proximity probes to ensure the accuracy and reliability of speed measurement. It has 8 analog inputs, which can be configured for any one of twenty-seven functions to meet different measurement and control requirements. It also has 20 contact inputs, among which the first four are defaulted for shutdown, increasing the speed setpoint, resetting, and decreasing the speed setpoint. In addition, the device has two 4 - 20mA control outputs and eight type C relay contact outputs, which can be used to control external devices or interface with other systems.
- Analog Input: It uses a 4 - 20mA channel (with loop power supply), which can accurately measure various analog signals.
- Electromagnetic Compatibility Immunity: It complies with the EN 61000 - 6 - 2 standard, has strong electromagnetic interference resistance, and can work stably in complex electromagnetic environments.
- Enclosure Type: It is of the IACS UR E10 (merchant ship) type, suitable for relevant application scenarios such as ships, and has good protective performance.
- Features: It has the characteristics of ATEX, IP - 54, and pollution degree 3, and can be used in environments with explosive gases or dust. At the same time, it can effectively prevent the intrusion of dust and water.
- Input Voltage: It is a low-voltage 18 - 36VDC isolated voltage, adapting to different power supply conditions and improving the versatility and safety of the equipment.
- Operating Temperature and Storage Temperature: Both the operating temperature and the storage temperature range from -22 to 158 degrees Fahrenheit, allowing stable operation and storage within a relatively wide temperature range.
- Screen Size: It is equipped with an 8.4-inch liquid crystal display screen, providing a clear graphical interface and operation interface, facilitating operators to set parameters and monitor the status.
Main brands include: ABB, Bailey, GE, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, EMERSON EMERSON, B&R, MOTOROLA, FUANC, REXROTH, KUKA, HONEYWELL, NI, DEIF, Yokogawa, WOODWARD WOODWARD, Ryan, SCHNEIDER SCHNEIDER, Yaskawa, MOOG, EPRO, PROSOFT and other major brands
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