One. Logical stage
The so-called logical stage is to be able to complete the general logical planning in the relay system, since it is a relay system, so the knowledge of power drag is the foundation of this stage. I personally summarize that the root of learning the relay system lies in the word "grab", and the reason why the relay system can complete the logical control lies in this word. In the relay system, there are mainly three Dongdong A normally open; B normally closed; C-coil. This corresponds to the basic elements in the PLC, but the way of reading is different.
So is it possible to copy the original relay system? No way! The working methods of the two are different. All the hard elements in the relay system start to compete in the same tense, and all the soft elements in the PLC are scanned and calculated by the PLC's CPU, and finally calculate the results of the tense, which is the PLC scanning cycle working method. (Any PLC book has an introduction)
Essentials:
1. This stage is to learn electric dragging, which corresponds to the normally open, normally closed, and coil in the PLC ladder diagram.
2. Be able to complete a brief system planning
Two. Sequential phase
Sequential control is widely used in industry, such as general automatic machine tools, which is a sequential control process. There are two ways to complete the sequential control of PLC planning: first, the sequential control instruction in the PLC; Second, the control method of the stop. No matter what kind of control method, at the beginning of the planning, we have to finish the process, which is the head of the system, and there are three main aspects: one "step", two "activity steps", and three "conversion conditions".
Essentials:
1. Grasp the system clue and plan the system process
2. Grasp the "start and stop" control method and convert the flow chart into a ladder diagram
Able to complete general system planning
Three. Compilation phase
This stage is essentially different from the relay control system, which is the inability of the relay control system to be completed, and it is also the root of improving the function of the PLC control system! The reason why I call it the assembly stage is because it is very similar to the assembly language programming of the microcontroller, for example, the transmission instruction MOV in the microcontroller, and the high-level instruction in the PLC is also functional. This stage is more difficult, the first is to learn the basics of computers; Second, we should fully understand the internal functions and resources of PLC; Third, familiarize yourself with the function of advanced instructions (no rote memorization). If you don't understand the computer foundation, you can't understand it at all when learning advanced instructions and PLC resources, and the ideas in planning are very different from the relay system, for example: I0.0 and IB0, the first is "bit", that is, the "point" of logical planning, and the second is "byte", which is not involved in logical planning.
Essentials:
1. Computer foundation
2. PLC resources
3. Command function
4. Adapt to the program planning idea of single-chip microcomputer
Able to complete complex system planning
Four. Special Stage
Special phases are for systems with specific functions, such as motion control, PID temperature control, network connection, etc. Different PLCs can complete different functions, some functions are integrated in the PLC and some are required to expand, so it is necessary to choose according to different control objects. Grasping this stage can greatly improve the PLC program, but it is also necessary to grasp other automation knowledge other than PLC, such as servo, inverter and so on.
Essentials:
1. Understand the requirements of the system composition
2. Reasonable selection of expansion units
3. Learn how to use the extended unit
Able to complete special system planning
This stage of learning can only be completed under certain practical conditions
Five. Network stage
With the development of automation technology, the use of PLC as a lower computer is also very common. At this stage, the group needs to learn the communication protocols of different PLCs and some communication instructions, such as the PLC to control the inverter through the programming port, such as Siemens' USS protocol, and exchange information with the inverter. There are also industrial Ethernet and fieldbus such as Xizi's PROFIBUS; AS-i; Wait a minute.
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Parameter setting of LS power inverter
The inverter is a high-tech intelligent product, in order to let it complete the specified control mission, it must be set parameters, otherwise, it is like the computer is not installed and used, and it cannot be operated normally. The parameter setting is carried out by the control surface of the inverter. All kinds of inverters ...
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Precautions for the use of inverter - LS produces electricity
1. The inverter should not be installed on the equipment with vibration, because the main circuit connection screw in the inverter is simply loose, and many inverters are damaged due to this reason.
Second, the wiring problem: the inverter input termination on an air initial maintenance current value can not be too large, ...
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LS power production contactor selection
How LS Contactor Works:
Generally, after the contactor coil is energized, the entire coil current will generate a magnetic field, which will make the core inside have electromagnetic attraction to attract the core, and let their communication contactor point action normally closed contact disconnect, or close, which ...
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Communication control of inverter - power inverter
The communication control of the inverter is more complicated, so it is listed separately.
The communication control of the inverter is a control method for the operation, speed regulation and status indication of the inverter through the communication interface of the inverter.
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Inverter maintenance fault handling method - LS power generation
1. Not manifested. This situation is more common, generally in the normal condition of the external three-phase power supply, it is the switching power supply of the inverter burned, and the 24 volt power supply on the output board of the inverter terminal can be measured.
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Inverter maintenance principle analysis and inspection method
Principle analysis is the most fundamental way to eliminate the problem, when other methods are difficult to see the effect, you can start from the basic principle of the circuit, step by step to view, and finally find out the cause of the problem. To use this method, it is necessary to have a clear understanding of the principle of the circuit, and to grasp the various ...
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Inverter harmonic calculation method - LS power generation
1. Method 1
Method 1: Fourier transform to obtain the amplitude and phase of each harmonic of voltage and current, calculate the active power of each harmonic according to P=√3UIcosφ, and add the active power of all harmonics to obtain the harmonic power.
Method 2: Measure the total active work ...
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1. Inverter and the motor to be operated
(1) The number of poles of the motor. General motor ...
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Motor & Electrical Control Technology Tips - LS Electricity Production
1. Low-voltage electrical appliances: refers to electrical appliances that play the role of on-off, maintenance, control or regulation in circuits with a rated voltage of 1200V and a rated voltage of 1500V and below.
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The working principle of LS PLC module
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The difference between multi-function and general-purpose inverters
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Specifications for the use of power converters
Operating regulations for power inverters
Maintenance & Installation
Work according to the weight of the product.
The number of inverter boxes cannot be stacked in excess of the specified number.
Install according to the user manual.
Do not open the case during transport.
Do not place ...
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Failure analysis of electromagnetic system of LS power production contactor
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Precautions for inverter installation tips - LS power generation
When the line power supply exceeds the driver's kV-A rating by 10 times, add a line reactor.
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LS static test to determine the fault of the inverter
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