Industry News
Electric valve underground drainage system in automatic control ---2009-10-30
Yanzhou Mining (Group) Corporation, North residential coal use sensors to monitor the water level underground water storage, water pump entrance and exit of vacuum pressure, electrical parameters such as operating current, and the use of programmable logic controller according to the level of the water storage level and the cumulative number of consecutive start 3 sets of conditions, such as automatic control of pump start and stop, to achieve the rotation to start, fault alarm and protection features such as shutdown, thus bringing about the underground drainage system in automatic control.
Pump house them under two levels of automatic monitoring system requirements and future expansion requirements, use of Siemens S7-300 programmable logic controller, and is equipped with a 32-point digital input module, a 16-point digital input modules and two Block 8 analog input module. The software design ideas are as follows: The procedure is adopted to determine the level of water to control the pump start and stop. When the liquid level when the water level reaches the set up, run the boot process, open the jet solenoid valve automatic irrigation water, open the drainage pump, automatic drain pipes on the road to open the electric valve to achieve drainage pump automatic boot; When the liquid level down to set the water level , run the shutdown program to automatically shut down the electric road drain valve, close the drain pump to achieve drainage pump automatic boot.
Site-specific scenarios, the main consideration of the following anti-interference measures: in choosing a system when the module power consumption calculation, strictly followed the total power consumption of each module is less than the value of the framework of the capacity of the power principle; adopt the "one to one" shield cable directly to the transmitter output signal into the PLC; analog input, the system itself has analog circuits and digital circuits optical distance from the main consideration in use of external interference suppression, such as ensuring a stable supply voltage to ensure the A / D conversion accuracy, attention to input and output impedance matching, analog input range should not exceed the allowable values, etc.; during the installation process, in order to prevent electromagnetic interference, all input lines and strong electric wires strictly separate input lines and output lines separate the connection, can not be separated when you only use the overall shielded cable, shield grounded at the PLC side; in the software programming on the process by setting a password, self-test program, forced to run such measures to improve the software, anti-jamming capability to ensure system-wide support to run.
Pump house them under two levels of automatic monitoring system requirements and future expansion requirements, use of Siemens S7-300 programmable logic controller, and is equipped with a 32-point digital input module, a 16-point digital input modules and two Block 8 analog input module. The software design ideas are as follows: The procedure is adopted to determine the level of water to control the pump start and stop. When the liquid level when the water level reaches the set up, run the boot process, open the jet solenoid valve automatic irrigation water, open the drainage pump, automatic drain pipes on the road to open the electric valve to achieve drainage pump automatic boot; When the liquid level down to set the water level , run the shutdown program to automatically shut down the electric road drain valve, close the drain pump to achieve drainage pump automatic boot.
Site-specific scenarios, the main consideration of the following anti-interference measures: in choosing a system when the module power consumption calculation, strictly followed the total power consumption of each module is less than the value of the framework of the capacity of the power principle; adopt the "one to one" shield cable directly to the transmitter output signal into the PLC; analog input, the system itself has analog circuits and digital circuits optical distance from the main consideration in use of external interference suppression, such as ensuring a stable supply voltage to ensure the A / D conversion accuracy, attention to input and output impedance matching, analog input range should not exceed the allowable values, etc.; during the installation process, in order to prevent electromagnetic interference, all input lines and strong electric wires strictly separate input lines and output lines separate the connection, can not be separated when you only use the overall shielded cable, shield grounded at the PLC side; in the software programming on the process by setting a password, self-test program, forced to run such measures to improve the software, anti-jamming capability to ensure system-wide support to run.
