When the inverter is used to form an active control system for control, in many cases, the PLC and the inverter are used together, and how to correctly connect the PLC and the inverter together has become the key to the success of the system.
1. PLC switch command signal input
The input signal of the inverter includes a switching command signal that operates the operation status such as operation/stop, forward/rotation, and micro-motion. The inverter is generally connected to the PLC by means of relay contacts or devices with relay contact switch characteristics (such as transistors) to the operation status command.
When using relay contacts, they often cause malfunction due to poor contact; When using transistors for connection, it is necessary to consider the voltage and current capacity of the transistors themselves to ensure the reliability of the system.
Attention should also be paid to the planning of the input signal circuit of the inverter, which will also cause the inverter malfunction when the input signal circuit is not connected. For example, when the input signal circuit is selected as a rational load such as a relay, the noise caused by the inrush current generated by the opening and closing of the relay may cause the inverter to malfunction, which should be avoided as much as possible.
When the input switching signal enters the inverter, there is a crosstalk between the external power supply and the inverter-controlled power supply (DC24V). The correct connection is to connect the external transistor collector diode to the PLC using the PLC power supply.
2. Inverter numerical signal input
There are also some numerical (such as frequency, voltage, etc.) command signal input in the inverter, which can be divided into two types: digital input and analog input. The digital input is mostly given by the keyboard operation and serial interface on the inverter panel; If the analog input is the terminal block is given externally, generally 0-10V/5V voltage signal or 0/4-20mA current signal input. The interface circuit varies depending on the input signal, and it is necessary to select the PLC output module for the input impedance of the inverter.
When the inverter and PLC voltage signal planning are different, such as the input signal of the inverter is 0-10V, and the PLC output voltage signal is planned to be 0-5V; Or when the output signal voltage on one side of the PLC is planned to be 0-10V and the input voltage signal of the inverter is planned to be 0-5V, the allowable voltage, current and other elements of the inverter and transistor need to be connected in series to the current limiting resistor and voltage divider method to ensure that the corresponding capacity of the PLC and the inverter is not exceeded when opening and closing. In addition, care should be taken to separate the wiring when connecting to ensure that noise on one side of the main circuit does not spread to the control circuit.
Generally, the inverter also outputs the corresponding monitoring and simulation signal to the outside with the terminal block. The electrical signal planning is generally 0-10V/5V and 0/4-20mA current signal. In either case, you should pay attention: the input impedance on the PLC side should ensure that the voltage and current in the circuit do not exceed the allowable value of the circuit, so as to ensure the reliability of the system and reduce the error. In addition, the composition of these monitoring systems is different from each other, and if you are unsure, you should consult the manufacturer.
In addition, when using PLC for secondary control, the time when the CPU needs to process data is delayed, so it should be considered for more accurate control. In order to ensure that the noise generated by the main circuit circuit breaker and switchgear of the PLC invariant will have shortcomings, the following points should be paid attention to when connecting the inverter with the PLC:
(1) The PLC itself should be connected according to the regular wiring standards and conditions, and care should be taken to avoid wiring together with the inverter, and the two should be separated as much as possible when connected.
(2) When the power supply conditions are not very good, the PLC power supply module and the input/output module power supply line should be connected to the noise filter and the transformer for noise reduction. In addition, if necessary, corresponding measures should be taken on the side of the inverter.
(3) When the inverter and PLC are installed in the same operating cabinet, the wires related to the inverter and the wires related to the PLC should be separated as far as possible.
(4) Use shielded wire and twisted pair to improve the noise annoyance level.
|
More on that
|
Mitsubishi drive functions and functions
1. Control the start, stop, speed and so on of the servo motor;
2. Carry out various maintenance on the motor (overload, short circuit, undervoltage, etc.)
3. Respond to external signals, and control the servo motor (position, speed, torque) after internal PID conditioning;
The manipulator is the control of the electric ...
|
|
The difference between Mitsubishi FX3u and FX5u
Mitsubishi FX3U series PLC is the third generation of miniature programmable manipulators, using a class of programmable memory for its internal storage programs, to execute logic operations, sequence control, timing, counting and arithmetic operations and other user-oriented instructions, and through digital or analog input/output control of each ...
|
|
Functional characteristics of Mitsubishi's various series of servo motors
Mitsubishi servo motor system series: MR-J2S series, MR-J3 series, MR-ES series, MR-E series.
Mitsubishi servo motor MR-J2S series
1. The product also has RS-232 and RS-422 serial communication functions, which can be used by a personal computer equipped with servo setting software.
|
|
Mitsubishi inverter FR-A800 series selection
Q: When will the CS84 series inverter be selected?
A: CS80 series inverter belongs to the diversified function of small intelligent inverter, covering excitation control and general flux vector control, the volume is 57% of the same model, very fast, in some general functions can be used in this model ...
|
|
Mitsubishi Electric Solutions serves the entire process of lithium battery production
Mitsubishi Electric's MES system MELNAVI has a standard database, which can meet the needs of the 11 major functions required by MES, and also supports flexible secondary development, which can easily connect the upper ERP and lower automation products in a short time, and can also be connected to other APS scheduling software and analysis systems. ...
|
|
Introduction to Mitsubishi tension controllers
1. Tension Manipulator Principle - Introduction
The tension manipulator can be called the tension manipulator, which is usually used with magnetic particle brake, magnetic particle clutch and tension detector, which is suitable for winding, unwinding, tension control, etc. It also has the so-called manual control function, which generally refers to the fact that human beings can ...
|
|
PLC control cabinet design and use to meet the heat dissipation requirements - Mitsubishi
The PLC control cabinet is the final level of equipment in the power distribution system. It mainly protects, supervises and controls the entire circuit, which is convenient for unified management. The power distribution cabinet is a kind of equipment that can reasonably distribute electrical energy and make the circuit easy to open and close. But because it is a circuit device, the requirements for the level of safety protection ...
|
|
Mitsubishi PLC controls the control method of the inverter
1. Use the switching signal of PLC to control the inverter
The output point and COM point of the PLC (MR type or MT type) are directly connected to the STF (forward engine), RH (high speed), RM (medium speed), RL (low speed), and SG input ports of the inverter. The PLC can control the inverter through the program.
|
|
What is the difference between the Mitsubishi PLC FX3U and FX5U
1. The speed of the system bus is different. Although the FX5U series is small but precise, compared with the previous product FX3U, the system bus speed is greatly increased by 150 times, and the maximum expansion module can be expanded by 16 intelligent expansion modules, built-in 2-in and 1-out analog functions, built-in Ethernet interface and 4-axis 200kHz high-speed positioning function.
...
|
|
Analysis of the conversion principle of Mitsubishi PLC
1. The digital-to-analog converter is a system that converts digital signals into imitation signals, which can generally be completed by low-pass filtering. The digital signal is decoded in the first line, that is, the digital code is converted into the corresponding level to form a stepped signal, and then the low-pass filter is carried out.
According to the signal and system ...
|
|
The connection of the Mitsubishi inverter FR-A800
The connection of the Mitsubishi inverter FR-A800
|
|
Mitsubishi low-power Z024 series inverter failure OC cause
(1) Aging of the drive circuit
Due to the use of a long period of time, it will inevitably lead to the aging of components, which will cause the drive waveform to be distorted, and the output voltage will be unstable, so OC alarm will often appear as soon as it is running.
( ...
|
|
How to configure the mechanical torque period of the inverter - Mitsubishi inverter
1. The starting torque that makes the mechanical equipment roll from a standstill state is usually positive, and generally larger than the torque required to maintain constant velocity movement, such as most feeders, material conveyors, mixers, mixers, etc., it may reach the additional torque of the Yuan Yuan Yuan Yu Yao Yuan Yuan ...
|
|
Mitsubishi PLC communication detection steps
When you are ready to communicate through AJ71QE71, perform the ping procedure in MS-DOS mode to check if the connection is correct before the Mitsubishi PLC's GPPW starts to communicate. Support communication with Weilun touch screen through serial port.
Under...
|
|
PLC industrial automation production line construction steps - Mitsubishi
When we select PLC as a controller for the construction of industrial automation production line, we should go through the following process, which is briefly described below:
1. First of all, the demand side, that is, Party A, needs to tell Party B what they want to achieve.
|
|
Mitsubishi PLC power supply live wire and neutral wire short circuit solution
1. First of all, the power supply should be cut off immediately and the circuit should be admitted whether it has been disconnected.
2. Next, check whether the fuse of the power supply is blown or whether the protector is tripped. Replace the fuse or reset the protector. Envy
3. Fuse ...
|
|
Mitsubishi inverter FR-E700 series is selected
Q: When will I choose the E740 series inverter?
A: E700 is an economical and small inverter with high driving performance, with the function of holding the brake, and can also add options to expand the function, which can be used for transportation, lifting occupations, and has high cost performance.
Q: Mitsubishi inverter E740 should ...
|
|
Mitsubishi Electric instruction format
(1) Arbitrary axis AC command (G140)
G140 Instruction Address = Axis Address Instruction Address = Axis Address ... ;
Command Address: Arbitrary Axis AC Command (G140) After that, specify the 1-character address set by the parameter (#12071-#12078) to be used for moving commands, etc.
|
|
Mitsubishi PLC advantages
Discrete control and motion control, Mitsubishi's instructions are abundant, there are dedicated positioning instructions, control servo and stepping are easy to complete, to complete some messy action control is also Mitsubishi's strength, and Siemens is weaker in this area, there is no special instruction, do servo or step positioning control is not ...
|
|
Pay attention to the wiring of the Mitsubishi PLCI/O terminal
1. Enter the wiring
(1) The input wiring should generally not exceed 30 meters. However, if the environmental disturbance is small and the voltage drop is not large, the input wiring can be appropriately longer.
(2) The input/output lines cannot be separated by the same cable, and the input/output lines should be separated.
(3) As far as possible, choose normally open ...
|
|
Contact
working hours
