1. Mitsubishi inverter is more and more widely used because of a series of advantages such as wide speed regulation range, high speed regulation accuracy, fast dynamic response, high work efficiency, convenient operation and easy interface with other equipment. Because of the high content of common sense and messy technology of Mitsubishi inverter, there are still many practical problems to be solved in how to use Mitsubishi inverter well. This paper discusses the technical issues of the use of Mitsubishi inverter in the use of devices, protection and fault treatment, and gives specific implementation measures.
2. When Mitsubishi inverter is selected for various equipment, high-order harmonics will occur together in the circuit of the power supply side and the motor side. With regard to the static electricity and electromagnetic disturbance caused by the higher harmonics, various considerations should be made in the installation of Mitsubishi inverters. In addition, in order to ensure the stable operation of Mitsubishi inverters, it is necessary to consider the installation environment such as temperature, humidity, dust, and vibration at the site where Mitsubishi inverters are installed.
2.1 Requirements for the installation environment: (1) The humidity should be 40-90. If the surrounding humidity is too high, there is a decrease in electrical insulation and corrosion of metal parts, while a significant decrease in ambient humidity is prone to insulation failure.
(2) The altitude is less than 1000m, because the Mitsubishi inverter insulation resistance is 20, and the altitude is super high, the more the cooling effect decreases.
(3) The ambient temperature is 10-40 °C, if the heat dissipation conditions are good, it is 2.2 device space, and the Mitsubishi inverter should be a straight device, if it is inverted or horizontal, overheating will occur. When installing, it should be satisfactorily spaced from other equipment, walls or circuit pipes to meet the requirements of heat dissipation.
(1) When the Mitsubishi inverter heats up and overheats the heat dissipation, the general equipment is damaged is relatively slow, and the temperature when it is damaged is usually not very accurate, and only in the SPWM inverter circuit, the temperature exceeds a certain limit, which will immediately lead to the damage of the inverter, and the temperature limit is very accurate.
The heat generation of Mitsubishi inverter is caused by the internal loss of power, and the share of the loss of each part of the inverter is roughly 50, the rectifier and DC circuit accounts for about 40, and the control and protection circuit accounts for 5——。 In order to prevent the temperature inside the Mitsubishi inverter from rising, it is necessary for the Mitsubishi inverter to fully emit the heat generated. The usual method is to remove the heat by cooling the fan. In general, the amount of air required to remove 1 kW of heat is about /s, and the first problem when installing a Mitsubishi inverter is how to ensure that the heat dissipation is unblocked.
(2) Device method (1) wall-mounted device: because the Mitsubishi inverter itself has a good shell, it is promised to directly lean against the wall device, that is, the wall-mounted device, as can be seen from the figure, in order to adhere to the outstanding ventilation, the two sides are separated by 100mm, and the upper and lower intervals are 150mm, and the device should be straight. In addition, in order to prevent foreign objects from falling on the air outlet of the Mitsubishi inverter and blocking the air duct, a protective mesh cover should be installed on the upper and lower parts of the Mitsubishi inverter's device protection and fault treatment Hu Xuezhi and Wu Hongxia's tuyere.
(2) cabinet device: when there is more dust around, or when there are more electrical appliances, choose cabinet device, if the environment is cleaner, you can choose to use the cabinet cooling method, if the cabinet is cooled, the cabinet top is equipped with an exhaust cooling fan, and the position of the cooling fan should be as far as possible above the Mitsubishi inverter. When two or more Mitsubishi inverters are installed in a control cabinet, they should generally be installed side by side. If it is necessary to choose the longitudinal method (a) horizontal placement (b) longitudinal placement, the distance should be at least 50cm, and a partition should be added between the two Mitsubishi inverters, so as to prevent the hot air from the Mitsubishi inverter below from entering the Mitsubishi inverter above.
2.3 Mitsubishi inverter wiring and noise prevention (1) main circuit wiring and Mitsubishi inverter and power frequency power switching circuit: the main circuit wiring R, S, T is the input end, and the power supply inlet line U, V, W is the output end, connected to the motor, do not agree to connect the wrong one, otherwise the inverter will be burned out immediately. When the Mitsubishi inverter is switched to the power supply circuit, it is not agreed to connect to the motor when the Mitsubishi inverter has already output a certain frequency, it is necessary for KM2 to connect the motor with the output of VVVF first, and then KM1 is switched on, and pay attention to the interlock of KM1 and KM3, and KM2 and KM3 can not be connected together. The cable should be selected at the maximum current on the output side when the voltage drops below the additional voltage 2.
(2) Wiring of the control circuit: the wiring of the control circuit should be shielded twisted pair, the pitch of the twisted pair should be less than 15mm, the shield is close to one end of the Mitsubishi inverter, and the common end CM of the control circuit should be connected, and the other end is suspended. The power supply line should be separated by at least 100mm between the weak current control wires, and should never be placed in the same wire duct. Moreover, when the wiring of the control circuit intersects with the wiring of the main circuit, it should intersect at a right angle (such as stranding is appropriate). If the operation command comes from a distance and the wiring of the control circuit needs to be longer, the relay relay can be selected. In addition, absorber circuits should be connected to both ends of the coils of contactors, electromagnetic relays, etc.
(3) Anti-drying: In order to solve these problems, it is necessary to install an appropriate reactor in the main circuit of Mitsubishi inverter in the main circuit of Mitsubishi inverter. The use of IGBT high-micro motor fast switching in Mitsubishi inverters can cause noise, and the reactor is pressed with radio disturbance (RFI) to reduce this noise. The connection method of RFI reactors varies according to the different capacity of Mitsubishi inverters, generally when the capacity is small, each phase wire is wound more than 4 times in the same direction [3].
The supply-side AC reactor is used to suppress the inrush current in the input circuit and to attenuate the effects of the supply voltage imbalance. The DC reactor DC is used to improve the power factor (up to 0.95). Mitsubishi inverter manufacturers generally have reactors to choose from.
(4) Mitsubishi inverter grounding: All Mitsubishi inverters have a special grounding terminal E, and the user should connect this terminal with the ground. When the Mitsubishi inverter is grounded with other equipment, or multiple Mitsubishi inverters, each equipment is connected to the ground wire separately, and the grounding terminal of one equipment is not connected to the ground terminal of the other unit.
|
More on that
|
Mitsubishi PLC adjusts the built-in time
1. TWR (Time Write) command
Write the time preset value to the built-in real-time clock: Clock information is written to the TWR (Time Write) command. The sequence number of the action instruction is FNC167, [S ·] T, C and D can be used, and only 16-bit operations can be used, accounting for 5 program steps.
The work of the directive ...
|
|
Mitsubishi servo motor shaft failure causes and solutions
1. The cause of the failure
(1) Unreasonable mechanical design leads to excessive radial load force;
(2) The load side is stuck, or the moment of severe overload;
(3) The motor and reducer are not centered when installed;
2. Fault cleaning
...
|
|
Debugging method of servo motor - Mitsubishi
1. Initialize parameters
Before wiring, initialize the parameters.
On the control card: select the control method; Reset the PID parameter to zero; When the control card is powered on, the enable signal is closed by default; Save this state to ensure that this is the status when the control card is powered on again.
...
|
|
Mitsubishi 5uplc monitors modbusTCP disconnect methods
First, Mitsubishi uses FX5U series PLC with serial port and built-in modbus communication protocol, so that we can easily communicate with third-party equipment. If it is a communication between Mitsubishi PLC and the inverter, the focus is on designing the parameters. The inverter is heavy, set the address, baud rate, check, etc., ...
|
|
Mitsubishi inverter control method
There are several ways to classify Mitsubishi inverters:
According to the classification of the main circuit operation method, it can be divided into voltage-type inverter and current-type inverter; According to the classification of switching methods, it can be divided into PAM control inverter, PWM control inverter and high carrier frequency PWM control inverter;
Depend on...
|
|
Mitsubishi servo drive system requirements
Servo drive system requirements
1. Wide speed regulation
2. High positioning accuracy
3. Satisfactory transmission rigidity and high speed stability
4. Fast response, no overshoot
In order to ensure productivity and processing quality, in addition to the requirement of high positioning accuracy ...
|
|
Mitsubishi PLC writes the holding circuit
There is a very common kind of circuit in Mitsubishi PLC - the persistence circuit. The insistence circuit means that when the external input switch is a button, it can be pressed through the insistence circuit to press the button to insist on the output, similar to the self-locking in the electrical diagram. Let's take Mitsubishi PLC as an example to write a sticking circuit.
...
|
|
The relationship between torque and performance of Mitsubishi servo motors
1. Additional torque
The torque that occurs on the motor shaft under additional voltage, extra load is called the extra torque of the motor.
2. Starting torque
The torque generated by the motor at the moment when a voltage is applied to the motor in the aborted condition is called the starting torque. The starting torque characterizes the electrical...
|
|
Mitsubishi Electric expands 6th generation 1200V large-scale DIPIPM
Power semiconductor module for 40kW class commercial air conditioner
Expansion of the "6th Generation 1200V Large DIPIPM" product lineup
Mitsubishi Electric Corporation will sell the power of inverters that drive commercial air conditioners and other products on August 30.
|
|
Confirmation and clearing of Mitsubishi inverter FR-CS80 alarm history
When the FR-CS80 inverter detects an abnormality, it will display an error message or alarm in the operation panel according to the abnormal content, or maintain the function action and block the output of the inverter. When maintaining a function operation, please deal with the cause of its operation before resetting the inverter, and then start working. ...
|
|
There is no self-locking reason for the Mitsubishi servo motor to be turned on
In some cases, when the user first touches the use of the Mitsubishi servo motor, it may appear that the Mitsubishi servo motor is not self-locking after it is ready! So, what is the reason for this? And how to deal with it?
...
|
|
Mitsubishi catalogue of some small PLC models and commonly used touch screens
Commonly used touch screen model description
Economical touch screen GS2107-WTBD 7 inch widescreen, 800*480, 65535 colors, USB/232/422/Ethernet, DC
Pass through...
|
|
Mitsubishi FX3u interrupts the location command
The main effect of aborting the positioning instruction is that in some machine tools, when we give the abort signal and can walk to the distance we set, for example, if the mechanical structure needs to use the sensor to determine the position to go, you can use the abort positioning instruction to do, when the induction gives the abort.
|
|
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 Comparison Instruction Application
1. Compare the instruction CMP
1）。 16-bit arithmetic (CMP, CMPP) compares the contents of the comparison value S1 with the comparison source S2, and according to the results (small, - zhi, large), D, D+1, D+2 - one is ON.
...
|
|
Introduction to Mitsubishi PLC Modbus communication and address allocation
When using Modbus communication in Mitsubishi PLCs, it is necessary to understand the address allocation of different register types.
The following are the common types of Mitsubishi PLC Modbus addresses and their corresponding functions:
1. Coil Register: ...
|
|
Mitsubishi PLC FX series position control unit
The FX-20GM is a 2-axis positioning machine that can be operated independently.
1. Pulse output unit
1. Point-controlled pulse output unit F2-30GM
2. Pulse output module FX-1PG (for FX2 and FX2C)
...
|
|
The essential difference between single-chip microcomputer and PLC - Mitsubishi PLC
The difference between PLC and single-chip microcomputer:
1. PLC is a relatively sophisticated control system composed of single-chip microcomputer, and it is a product of the sophisticated and stable single-chip microcomputer application system that has been debugged. There is strong versatility.
2. The single-chip microcomputer can constitute a variety of application systems, and the scale of application ...
|
|
Mitsubishi servo system failure problem
The origin position is incorrect, and the encoder debugs/zeros the bit
Replacement bearings, bearing groove wear, rotor cracking, shaft cracking
Gear groove wear
The magnet bursts steel, the magnet falls, gets stuck and doesn't move
Encoder wear, code ...
|
|
Mitsubishi inverter basic questions and answers
1. Question: What is the type of RS485 to RS232C converter used by Mitsubishi inverter for communication?
Solution: FA-T-RS40* Mitsubishi inverter is available.
2. Question: Mitsubishi inverter frequency external potentiometer is given, and the external potential recommended to be used ...
|
|
Contact
working hours
