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introduction： 1 introduction In converter andPLCIntegrated application area,It is usually necessary to automatically control the operation frequency of the inverter according to a variable on the site。Textile process humidification system is a typical example。In the past design,Generally, the operating frequency of the inverter is controlled by the analog output module。But this method is expensive,And analog quantity module output4-20mACurrent signal...
2016-02-11 Reading quantity 1731
introduction：This paper summarizes the combinatorial logic function method commonly used at present、Function transfer mapping、PetriNetwork analysis and other programmable controller programming methods，This paper presents an object-oriented programming method for programmable controller。According to the idea of object-oriented technology，How to construct the basic control of the bottom layer in the programming of the programmable controller is described in detail...
2016-02-10 Reading quantity 1773
introduction： one、sketch Over the years，Programmable controller(Hereinafter referred to as vacuum drying ovenPLC)From its creation to the present，It realizes the leap from wiring logic to storage logic；Its function is from weak to strong，The progress from logical control to digital control is realized；Its application field has grown from small to large，real...
2016-02-10 Reading quantity 1659
introduction： 1、introduction Programmable controller（PLC）It is a new type of general automation control device，It will be traditional relay control technology、Computer technology and communication technology are integrated，It has strong control function，Can be*High sex，...
2016-02-10 Reading quantity 1638
introduction： 1General principles for selecting relays How to choose the relay correctly？One is to do it“Get to know each other”,That is, the properties of the controlled loop must first be determined for the object controlled by the relay、Characteristics and requirements for relays should be carefully investigated and thoroughly understood。secondly，The various characteristics of the relay itself are one by one、...
2016-02-09 Reading quantity 1882
introduction： The article describes the use of relays_Relay use precautions application The use of relay precautions1、 Transportation and installation A relay is a kind of precision machinery， Against abuse The mode of transmission is very sensitive，It has been used in the manufacturing process The method makes the relay get the best protection in the process of transportation， In the factory inspection as well as the user The use of installation，Do not destroy the initial performance of the relay，In addition, the following points should be noted： To prevent surface contamination of the leading end，Should not directly...
2016-02-09 Reading quantity 1559
introduction： The modern mechanical and electrical industry often encounters some complex movements，This has a great effect on the dynamic load of the motor。Servo drive is the core of many electromechanical systems，therefore，The choice of servo motor becomes particularly important。First of all, the motor that meets the given load requirements must be selected，And then press the price from there、weight、Volume and other technical and economic indicators to choose the most suitable motor。 （1）The traditional selection method Only the power of the motor is considered here，Speed is used for linear motionv（t），accelerationa（t）And the external forces requiredF（t）table...
2016-02-09 Reading quantity 1763
introduction： Which side to put the slider on(day,to,Controls(On the left)Or reverse operation side(right)). 1.About better,misfit. 2.Better go down than up. to...
2016-02-08 Reading quantity 2079
introduction：The article describes the role of time relays Time relay uses functional applications Use of time relays Mating technology ，Execution delay instruction。Can be Time relay controls electrical delay on/off. It is usually applied to all kinds of machinery、In telecommunications or electrical equipment Timing element of automatic control system,For example, there is a time relay in the star triangle starting circuit of the motor。
2016-02-08 Reading quantity 1689
introduction： In the programmable controller of this large instrument，There are a lot of small parts，Though small，But it has a very big effect，Can you give me some examples？The following small series to introduce you to the programmable controller memory and input and output unit related knowledge。 &n...
2016-02-07 Reading quantity 1748
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