1. It is necessary to figure out the basic parameters and shape of the device that needs to be replaced. The basic parameters include the rated operating current, the capacitance of the capacitor, the resistance value of the resistor, the value of the GTR Darlington device (current amplification factor), the switching characteristics of the IGBT (including IPM) device, and the saturation voltage. The form factor requirements include external dimensions, terminal placement, and mounting style, and then the required components are replaced with the same requirements.
2. All connectors should be recorded or marked when disassembled, so as to avoid misalignment when replacing or restoring.
3. The contact surface between the power device and the heat sink should be evenly coated with thermal grease and fastened with screws.
Finally, in most cases, the machine is in operation, and when the machine is not running, the inverter needs to be properly stored and maintained.
1. Storage
The room should be dry, no direct sunlight, no corrosive gas, no dust; The relative humidity is 20%-90% and there is no frost; The temperature is between -10 and 30 °C (if the temperature is around 40 °C, the storage period should not exceed 6 months; About 50°C, the storage period is not more than 3 months).
2. Maintenance
Because the main circuit and control circuit of the inverter use more electrolytic capacitors, if not used for a long time, the leakage will increase, the withstand voltage will decrease, that is, accelerate the deterioration (the higher the temperature, the faster the deterioration), therefore, at least once a year, the external power supply is added at least once a year, so that the repair power-on time is 30-60min, the characteristic is that only the inverter monomer is energized (do not have to be connected to the motor), and the input end of the inverter can be connected to the power supply.
|
More on that
|
Megmeet PLC - What are the features of the PLC program?
1. Correctness (low debugging cost)
First of all, the PLC program must be able to work correctly to meet the requirements of the actual control process. This is the essence of the PLC program, and if you don't do that, nothing else makes sense.
2. Reliability (low maintenance cost)
Not only to ...
|
|
Megmeet servo drive - common faults and treatment methods of servo drives
1. The motor runs differently in both directions
Cause of failure: The phase of the brushless motor is wrong; The deviation potentiometer is in the wrong position.
Solution: Detect or detect the correct phase; Reposition the potentiometer.
2. The motor speed is abnormal
Cause of failure ...
|
|
Megmeet PLC - common causes and treatment methods of PLC failures
Peripheral circuit component failure
This type of failure often occurs in the failure of the PLC after a certain period of work. In the PLC control loop, if there is a component damage fault, the PLC control system will immediately and automatically stop working.
The input circuit is PLC to accept switching quantities, analog quantities, etc.
|
|
Megmeet inverter - over-temperature protection for common fault analysis and treatment of inverter
1. Over-temperature protection of inverter and its necessity
The temperature protection function of the inverter is an indispensable condition to ensure the stable operation of the inverter; In the main circuit power device of the inverter, the rectifier bridge and the inverter bridge are semiconductor power devices.
|
|
Megmeet inverter – the inverter's protection of itself, the motor and the system
1. The inverter protects itself
Instantaneous overcurrent, overvoltage, undervoltage, overload, short circuit to ground, abnormal control circuit, then for the protection of the inverter itself, the limit value of overcurrent, overvoltage, undervoltage, etc., when the inverter is running, if it exceeds ...
|
|
Megmeet inverter - classification and introduction of high-voltage inverter
There are many types of high-voltage inverters, and their classification methods are also diverse. According to whether there is a DC part in the intermediate link, it can be divided into AC inverter and AC AC inverter; According to the nature of the DC part, it can be divided into current type and voltage type inverter; According to whether there is an intermediate low-voltage circuit, it can be divided into high...
|
|
Megmeet inverter - precautions for inverters at high temperatures
1. Carefully monitor and record the display parameters on the man-machine interface of the inverter, and reflect the abnormality immediately;
2. Carefully monitor and record the ambient temperature of the frequency conversion room, and the ambient temperature should be between -5 °C and 40 °C. The temperature rise of the phase-shifting transformer should not exceed 130°C;
3. Summer ...
|
|
Megmeet welding machine - Classification and difference of laser spot welding machine
Laser spot welding machine, also known as resistance welding machine, is usually divided into three categories according to the nature of the welding power source: 1. AC spot welding machine; 2. Energy storage spot welding machine; 3. DC spot welding machine.
1. AC spot welding machine
Precision AC spot welding machine generally refers to the spot welding machine with a power of less than 16KVA.
|
|
Megmeet drives – a common fault in low-voltage drives
External electromagnetic interference can easily cause malfunctions
If there are interference sources around the inverter, they will invade the inside of the inverter through radiation or power lines, causing the control loop to malfunction, causing abnormal operation or shutdown, and even damage to the inverter in severe cases. Noise suppression on the outside ...
|
|
Megmeet Inverter - Summary of Common Faults of High Voltage Inverter (11-20)
11。 If the interface board does not communicate with the monitor and does not establish communication with the interface board, the interface board will reset the monitor every 5 seconds, and if the communication is not established within 3 minutes and 30 seconds, it will be judged as a serious fault. Whether the communication line is normal, check whether the terminal is correct; Whether the I/O board is working properly. Especially the work ...
|
|
The principle and characteristics of Megmeet tungsten argon arc welding and resistance welding
3) Tungsten argon arc welding (TIG)
Non-melting electrode gas arc welding, TIG welding, English is Tungsten Inert Gas (abbreviated TIG), also known as Gas Tungsten Arc Welding (abbreviated GTAW)
The principle is: TIG welding is in argon and other inert gases.
|
|
Megmeet inverter - the speed regulation method of high-voltage inverter
1. Hydraulic coupling method. That is, a hydraulic coupling device is inserted between the motor and the load in series, and the size of the coupling force between the motor and the load is adjusted by the height of the liquid level, so as to realize the speed adjustment of the load;
2. Cascade speed regulation. Tandem speed regulation must use a wound asynchronous motor, and the rotor ...
|
|
Megmeet inverter - introduction to the control method of low-voltage inverter
1. Sinusoidal pulse width modulation
Sinusoidal Pulse Width Modulation (SPWM) is characterized by simple structure of control circuit, low cost, good hardness of mechanical characteristics, and can meet the smooth speed regulation requirements of general transmission, and has been widely used in various fields of the industry.
However, this control ...
|
|
Megmeet welding machine - introduction to the advantages and disadvantages of carbon dioxide gas shielded welding
Carbon dioxide gas shielded welding (referred to as CO2 welding) is the use of CO2 gas as the maintenance medium, during welding, CO2 gas is sprayed out through the nozzle of the welding gun, along the perimeter of the welding wire, forming a gas maintenance layer around the arc, mechanically isolating the welding arc and the molten pool from the air, and then avoiding ...
|
|
Common faults and solutions of Megmeet PLC
1. Do not execute the program: The input check is identified by the input LED indicator or the input monitor composed of a writer. When the input LED is not lit, it can be preliminarily determined that the external input system is faulty, and then check with the multimeter.
If the output voltage is not normal, it can be determined that ...
|
|
Megmeet inverter - how to choose the inverter?
1. Understand the type of variable frequency load
The correct selection of the frequency converter is very critical for the proper operation of the control system. When selecting a frequency converter, it is important to fully understand the load characteristics driven by the frequency converter. In practice, production machinery is often divided into three types: constant torque load, constant ...
|
|
Megmeet PLC – System integration for PLC
In the manufacturing industry, there are a large number of open-loop sequential control based on switching quantities, which carries out sequential action numbers according to logical conditions and operates in chronological order; In addition, there is the control of chain protection actions according to the logical relationship that is not related to the sequence and timing; As well as a large number of switching quantities, pulse quantities, gauges...
|
|
Megmeet PLC – 10 PLCs integrated failure analysis
1. Grounding problems
The grounding requirements of the PLC system are relatively strict, and it is best to have an independent dedicated grounding system, and it should also be noted that other equipment related to PLC should also be reliably grounded.
When multiple circuit grounding points are connected together, unexpected currents can be generated, resulting in logic errors or ...
|
|
Megmeet PLC - What are the steps to complete PLC commissioning?
1. Check the circuit according to the drawing (without power transmission)
The drawings of the general PLC system include two parts: the drawings in the cabinet and the drawings outside the cabinet; The drawing in the cabinet refers to the wiring diagram inside the cabinet; The out-of-cabinet drawings are the wiring diagrams of all electrical cabinets.
This part needs to be checked for;
...
|
|
Megmeet welding machines – the main application area of resistance welding
(1) Spot welding: The weldment is pressed between the two cylindrical electrodes, heated by electricity, so that the weldment melts at the contact to form a nugget, and then the power is cut off, and it solidifies and crystallizes under pressure to form a dense solder joint.
Spot welding is suitable for welding thin plates (laps) and steel bars below 4 mm.
|
|
Contact
working hours
