Based on PLC intelligent solutions - mine combination switch products Industrial control -

1, the introduction

mine explosion-proof and intrinsically safe six circuits electromagnetic starter for mine combination switch for short. Mine combination switch in containing explosive dangerous gas ( Methane) And coal mine environment to the rated voltage of 1140 v or 660 v power supply circuit of single or more ( Less than 6) Three phase squirrel-cage asynchronous motor starting stop control and protection. Mine combination switch is reliable in performance, strong anti-interference ability, easy operation, good man-machine interface of intelligent mine motors special monitoring system, mine combination switch with at least one group of main isolation between the source and load switch and a set of auxiliary isolating switch group, each group of main disconnecting switch group including main isolating switch, vacuum contactor, leakage blocking test and current transformer, voltage transformer, secondary isolation switch group includes auxiliary isolating switch, power transformer, filter, isolation transformer and power supply module, also has the data processing module, display module, control module and the guide module. Intelligent mine combination switch products as shown in figure 1. Figure 1

smart mine combination switch

2, system solutions

2. Hardware configuration 1

mine combination switch control system based on PLC system hardware as shown in table 1. Table 1

hardware

2. Principle 2 system

1) System architecture. System consists of advocate complementary and in two sets of PLC touch screen man-machine interface operation. Table 10. 4 'high brightness of TFT LCD touch screen DOPA10THTD1 3 set of serial communication port, has the ability to connect different communication format controller, this case access two different brands of PLC at the same time, a heterogeneous integrated automation system, as shown in figure 2.

figure 2 system architecture ( 2) The main controller. Combination switch protection and the main control system adopts Siemens S7 - Germany 200 series PLC, to realize the monitoring system, and completes the leakage blocking, overload, short circuit, open phase, under-voltage and over-voltage protection function, such as intelligent degree is high, stable performance, reliable operation, etc.

( 3) Auxiliary controller. Combination switch blast field data input is the case with double PLC architecture. Because of the explosion field is not allowed to install the explosion-proof electric apparatus, so must be designed explosion-proof man-machine unit. Consider intelligent combination switch data input requirements, explosion-proof use 4 * 4 matrix keyboard, as shown in figure 3.

explosion-proof figure 3 4 * 4 matrix keyboard

keyboard data read in selection of DVP12SA11T small PLC controller, using the keyboard matrix driving principle of the PLC data read in circuit principle as shown in figure 4.

figure 4 principle of PLC data input keyboard

data display case as shown in figure 5.

figure 5 according to the picture

2. 3 monitoring function design

1) Adopted in the whole Chinese LCD display, cooperate in small PLC, realize the combination switch working condition, parameters, and fault type display and memory, and can modify specific parameter adjustment, friendly user interface, has the good man-machine conversation function, can greatly improve the efficiency of judging fault and troubleshooting.

( 2) All the analog signal to digital signal, with strong anti-interference ability, wiring simple and informative, reliable control accurate, etc.

( 3) Has perfect self-check, self diagnosis and fault simulation test function, can easily check the protection and control system is normal or not.

2。 4 technical indicators design

the combination switch, give full consideration to the coal mine working environment, machinery manufacturing, automation, measurement and control technology and instrumentation, computer application in subjects such as science and technology, the main technical indicators are as follows:

1) Voltage level: 1140/660 v; Frequency is: 50 hz (

2) The total current: 800 a, 1200 a, a single working current can reach 400 a

3) Current setting range: 30 -

(399 4) The leakage blocking protection: additional dc testing, v - 1140 40 kΩ,660 v - 22kΩ。

( 5) Pilot control ( Intrinsically safe control) ：Igmax《10mA，Idmax《15mA。

( 6) Overload protection, inverse time.

( 7) Short circuit protection: as picture ( 7 - 10 times) Ready, ( 3 - 5 times) 。

( 8) Phase failure protection: negative sequence detection, the set time limit;

( 9) Control mode: single - machine, single double speed, single speed double machine double speed, process control and other control mode.

3, conclusion

this combination switch application cases, embodies the powerful communication, man-machine interaction in touch screen, PLC and unique keyboard input application characteristics, greatly improve the application of touch screen in mine explosion-proof, replace the disadvantage of the conventional touch screen can only display memory, to improve labor productivity, ensure mine safety in production at the same time, also shows in the product characteristics.
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