1 Overview With the rapid development of computer control technology to microprocessor core programmable logic controller (PLC) control has been gradually Replace relay control, commonly used in the field of automatic control of all walks of life. The coal industry is no exception, but mine Underground drainage system still more by the main relay control, pump stop and choose to switch to open by the man to complete, it can not do under the water level or other parameters automatically open stop pumps, which will seriously affect the underground main water pumping station management and economic efficiency . Dai Mine was completed in 1999, the design production capacity of 1.8Mt / a of the modern mines, large underground water inflow, the central pump Design and installation of the 5 sets of MD500-57 81 motor temperature, bearing temperature, flow rate 3 times a drain Parameters, and through communication module and an integrated monitoring and control console for data exchange. The system is reliable, easy to operate , Auto level, the pump can save running costs. 2, mine drainage control system of main system components Daizhuang Central Pumping Station, the main underground drainage pump automatic control system as shown in Figure 1, the automatic control system consists of data from Dynamic acquisition, automatic rotation job, automatic control, dynamic display and fault recording alarm and communication interface 5 parts. 2, an automatic data acquisition and detection Automatic data acquisition and detection fall into two categories: analog data and digital data. rmal "style =" margin: 0cm 0cm 15.6pt; text-indent: 21pt; mso-para-margin-bottom: 1.0gd; mso-char-indent-count: 2.0 "> analog test data are: water storage water level, electrical current, the water pump axle temperature, motor temperature, 3 times a drain flow; digital test data are: high-pressure pump start counter vacuum circuit breaker and reactor vacuum contactor cabinet status, working status and power valve open and close position, vacuum pump working state, solenoid valve status, pump suction tube and vacuum pump outlet pressure. Automatic data acquisition mainly achieved by the PLC, PLC analog input module through the continuous detection of sump water level sensor, the water level change Conversion of the signal processing unit time to calculate different rates of water level rise in water level segment, to determine the mine discharge, emission control pump start and stop. Motor current, pump axle temperature, motor temperature, drainage flow, and other sensors and transmitters, mainly for monitoring the pump, motor operating conditions, over-limit alarm, in order to avoid damage to pumps and motors. PLC digital input module will collect all kinds of switch signal to the PLC as the logic processing conditions and basis for control of drainage pump start and stop. A few N-US "> PLC used in A / D module are integral way of transformation, allows the input signal of peak noise and induction noise averaging for noisy industrial premises. 2, 2 auto-rotation work In order to prevent backup or backup pumps and electrical equipment, electrical and piping long without Ershi moisture or other failure of electrical equipment is not The timely detection, emergency situations arise when the work the pump into standby pump when Xu, Yi Zhi Er not timely impact mine into the safety Benji Tong Chengxusheji Le 5 Taiwan pump Zidong work rotation control, control procedures, and Yun Xing Jiang Shuibeng Commitment Cishuo Shijianhuoguan Road to Parameters such as frequency and flow with automatic recording and accumulated, the system under these operating parameters in a certain order and with automatic start and stop pumps Should be piping, pumps and piping so that the utilization rate of the distribution, when a pump or to the valve failure, a trip pipeline leakage, the system automatically audible alarm and flashing in the dynamic touch screen display, recording, accident, while the pump or piping failure from ly: Times New Roman ; mso-hansi-font-family: Times New Roman "> move out of the rotation to work the rest of the pump and pipeline to continue the work of a certain sequence of automatic rotation, so as to achieve early fault detection, early processing, so as not to affect mine safety purposes. ??? 2, 3 automatic control system of the main mine drainage System control design uses the Japanese
Omron PLC for the control of type C200HE host machine for the modular structure of the PLC machine Shelf, CPU, Digital I / O, analog input, power supply and communication modules. PLC automatic control system based on water storage Water levels, underground electricity load of high and low peaks and electricity sectors under the level of section, valley segment, when the peak electricity power supply section Inter-segment (time period at any time according to actual situation on the touch screen to adjust and set) and other factors, a mathematical model Reasonable dispatch pumps, automatic and accurate issue of Kai, stop the pump command, control, five pumps running. To ensure the safety of underground production, reliable system operation, water pump automatic signal is a very important parameter, therefore, the system set up two water level sensors, analog and switch sensors, two sensors are located in the sump drainage with sump inside, PLC was going to get the analog signal is divided into several water level segment, calculated per unit time at different water levels increased rate of water level segment, which determine the mine discharge, simultaneous detection of underground supply current value, calculated power load rate , according to mine water and electricity load control in low-peak electricity price and the lowest opening day, pumps, power peaks and high tariffs to stop pump operation, in order to achieve peak averting valley and energy saving. 2, 4, the main mine drainage control system communication interface PLC through communication interface and communication protocols, and the touch screen to full duplex communication, working status of the pump unit and Operating Parameters spread to touch screen, to complete the dynamic display of data;???????, operators can also use the touch screen operating instructions Chuanzhi E8 accident alarm. Visual indication of solenoid valve and electric valve opening and closing position, real time situation and the vacuum pump pressure values . Filled with graphics as well as trends, bar graph and digital form of accurate real-time mode to display the water storage level, and the water level in the pump start and stop signals and paragraph by notice to the lower, low section, high section, high level sub-paragraph warning with different forms of staff members be reminded sound. Use of graphics, trend charts and visual displays in digital form, 3 times the instantaneous flow and total pipe flow, the monitoring of the underground electricity load capacity, the electrical current and the instantaneous load and the total pump capacity, pump axle temperature, motor temperature, etc. dynamic display, Overrun alarm, automatic recording fault type and time history data, and the bottom of the screen displayed the latest in a cycle of three fault (fault number can be displayed on the touch screen settings), to remind maintenance staff in a timely manner to avoid damage to pumps and motors . 3, the main mine drainage control system functions and features of the system family: Times New Roman "> (1) system control with automatic, semi-automatic and manual maintenance of three kinds of work. automatically when the water level detected by the PLC, pressure, and the signal, automatically run the pump, without human intervention ; semi-automatic ways of working, by the staff select a pump station or a few inputs, PLC automatically start and stop the selected pump and monitoring the work; manual troubleshooting and repair methods for the use of manual testing, when a water pump and its ancillary equipment failure, the pump will automatically exit the operation, does not affect the normal operation of other pumps. PLC cabinet with the prohibition of the pump start button, when equipment maintenance to prevent misuse of other personnel to ensure safe and reliable system . the system can be readily converted to automatic and semi-works operation. (2) PLC control program modular structure, the system can process sub-module debugging, piecewise operation. The program structure, with the Clear, simple, easy to understand, easy to simulate debugging, run rate and so on. 4 pumps and ancillary equipment operating conditions, real time water level, flow, pressure, temperature Degree, current, voltage parameters, overrun alarm, fault auto pop-up screen, automatic flash point of failure. A fault record, historical data query functions. ??? (7) The system has a communication interface, PLC and touch screen simultaneously and the ground monitoring and control host communication, transmission of data, exchange information, remote sensing and control functions to achieve. (8) There are several system protection features. Motor Fault: Using the PLC and touch screen monitors pump motor over-current, leakage, low voltage electrical failure, and to participate in control. Electric valve failure: integrated security surveillance by the motor valve motor overload, short circuit, leakage and under voltage fault, and participate in joint water pumpControl. Over-temperature protection: water pump long run, when the bearing temperature or stator temperature exceeds allowable value, through the protection device and the PLC to achieve the temperature limit alarm. Flow protection: When the pump starts or during normal operation, such as the flow rate of less than normal, by flow protection device to enable the Pumps stop, automatic conversion to start another pump. (9) water level and pressure control system based on the principle of rotation of pump work automatically extend the life of the pump. ???