Megmeet PLC common faults

Create Date: 2024-8-30 12:03:23|Source: MEGMEET

1. External equipment failure. Such faults come from external devices such as various sensors, switches, actuators, and loads. The failure of this part of the equipment will directly affect the control function of the system. This type of failure is usually caused by the quality and longevity of the equipment itself.

2. System failure. This is a total failure that affects the operation of the system. System failures can be divided into fixed failures and occasional failures. If a failure occurs, it can be restarted to restore the system to normal, just like our computer system, which can be considered an accidental failure. Conversely, if the reboot cannot be recovered and the hardware or software needs to be replaced before the system can live normally, it can be considered a fixed fault, which is generally caused by the wrong system design or the long operation of the system.

3. Hardware failure. This type of fault mainly refers to the fault caused by the damage of the modules in the system, such as CPU, memory, power supply, I/O module, etc. (especially I/O module). This type of fault is generally more obvious, and the impact is also accompanied, they are mainly caused by improper use or long use, and the aging of components in the module.

4. Software failure. This type of failure is caused by a bug in the software itself. The main thing is that the software design is not well thought out. It will be triggered as soon as the conditions are met. In practical engineering applications, software errors are almost unavoidable due to the complexity and workload of software, which raises the question of software reliability.

5. CPU abnormality: When the CPU is abnormally alarmed, check the device connected to the internal line of the CPU unit. The specific method is to replace the units that may cause failures in turn, find out the faulty units, and deal with them accordingly.

6. Memory abnormality: When the memory is abnormally alarmed, if it is a problem with the program memory, the fault will be reproduced after reprogramming. In this case, it may be that the interference of noise causes a change in the program, otherwise the memory should be replaced.

7. Abnormal input/output unit and abnormal expansion unit: When this kind of alarm occurs, the insertion status and cable connection status of the connector of the input/output unit and the expansion unit should be checked first, and the unit should be replaced after determining the fault.

More on that

	Megmeet drives – routine and regular maintenance of drives 1. Maintenance items and scope: Daily maintenance and maintenance of inverter Due to the influence of environmental temperature, humidity, dust and vibration, it will lead to the aging of the internal components of the inverter, resulting in the potential failure of the inverter or reducing the service life of the inverter. Therefore, there is a must ...
	Common faults and solutions of Megmeet inverter 1. Leakage protection switch Phenomenon: The leakage protection switch of the equipment is activated when the inverter is powered on or running Measures: When the inverter drives the motor, the leakage value is larger than that of the non-inverter system, and the leakage protection value of the leakage protection switch is required to be 150mA and above, and the action delay is ...
	Megmeet inverter - high-voltage inverter selection considerations First, the disadvantages Choosing too high a voltage level results in too high an investment and a long payback period. With the increase of the voltage level, the insulation of the motor must be improved, so that the price of the motor increases. The increase of voltage level increases the number of series connections of power semiconductor devices in the inverter, and the cost rises. ...
	Megmeet inverter - what are the control methods of the inverter? Sinusoidal Pulse Width Modulation (SPWM) control mode It 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 industry. However, this type of control is at low frequencies, ...
	Megmeet PLC - What is the difference between PLC and servo control system 1. The meaning of the representation is different: PLC is the abbreviation of planar optical waveguide (technology), the so-called planar optical waveguide, means that the optical waveguide is located in a plane. A servo control system is a feedback control system used to accurately follow or reproduce a certain process.
	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.
	Megmeet inverter maintenance and testing method Megmeet inverter maintenance and testing method 　　1. The Megmeet rectifier module is damaged It is usually caused by grid voltage or internal short circuit. In the case of sweeping internal short circuits, the rectifier bridge is replaced. When dealing with shortcomings on site, the user power grid should be checked. Such as electricity ...
	Megmeet PLC – the three programming languages of PLC 1. The ladder diagram language is the most commonly used programming language in PLC programming. The CPU reads physical input into a memory table, often referred to as an "input table". The form is evaluated for use in the procedure. Different platforms, using different types of registers; In each scan cycle, follow from left to right, ...
	Megmeet PLC - What is the difference between PLC and MCU? 1. PLC is a relatively mature control system composed of single-chip microcomputer, which is the product of a mature and stable single-chip microcomputer application system that has been debugged. It is highly versatile. 2. The single-chip microcomputer can form a variety of application systems, and the application range is wider. In the case of a single "microcontroller", it ...
	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...
	Analysis of the fault code of Megmeet welder 1. E1: indicates sensor failure. In this case, it is necessary to check whether the sensors of Megmeet are damaged or whether the wiring is loose. 2. E2: Indicates overweight load. At this point, it is necessary to check whether the load of Megmeet exceeds the set maximum load. 3. E3: Indicates battery ...
	The unified setting of the Megmeet welding machine and the parameter setting of the system 1. Unified setting of Megmeet welding machine The so-called unification of welding means that the welding machine automatically matches the welding voltage according to the currently set welding current and the unification voltage correction value. The unification setting of Megmeet welder should first turn on the function on the welder side, ...
	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...
	New Arrivals! Hollysys' two blockbuster products were unveiled at the Zhongguancun Forum Technology Trading Conference On September 24, the 2021 Zhongguancun Forum, co-sponsored by the Ministry of Science and Technology of China, the Chinese Academy of Sciences, the China Association for Science and Technology, and the Beijing Municipal People's Government, officially opened in Beijing. As one of the main agendas of the forum, the Zhongguancun International Technology Exchange Conference closely follows the "smart· healthy· carbon neutrality...
	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 drives – the design essentials of the drive control cabinet The inverter should be installed inside the control cabinet, and the design of the control cabinet should pay attention to the following issues: 1. Wiring specification of inverter The signal line and the power line must be separated: When using an analog signal to remotely control the inverter, in order to reduce the interference of the analog signal to equipment such as the inverter, ...
	Megmeet PLC - the characteristics of the working process of PLC 1. The PLC adopts the mode of centralized sampling and centralized output, which can reduce the influence of external interference. 2. The working process of PLC is the process of cyclic scanning. The duration of the cyclic scan depends on the speed of execution of the instructions and the length of the user's program. 3. Output to input ...
	Solutions to common faults of Megmeet inverter (2) Fault three Fault phenomenon: There is a rebound phenomenon when the rotation starts Solution: 1. Set the start frequency P08.02 and start frequency time P08.03 appropriately (such as P08.02=P08.03=0.5) 2. Appropriately reduce the stator resistance (P03.07) and no-load current value (P03.11 ...
	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 maintenance and processing methods 1. CPU abnormality: When the CPU is abnormally alarmed, check the device connected to the internal line of the CPU unit. The specific method is to replace the units that may cause failures in turn, find out the faulty units, and deal with them accordingly. 2. Memory abnormality: When the memory is abnormal alarm, if it is a program ...