1. How to distinguish between heavy faults and light faults
According to the occurrence time of inverter faults, we can divide the types of faults into two categories: sudden faults and intermittent faults:
(1) The sudden fault of inverter repair refers to the failure of the equipment to be presented without warning when the equipment is running, and there is no rule for the presentation of this fault, so it is difficult to find the cause of the fault, and when dealing with this kind of fault, the fault can only be analyzed by the inverter manufacturer, and the corresponding treatment method is proposed;
(2) The intermittent fault of inverter repair refers to the fault that will be presented every time the inverter runs for a period of time, which is generally caused by factors such as external environment and power instability, so it is relatively simple to find the cause, and can adopt measures as early as possible to avoid the occurrence of faults.
According to the orientation of the inverter fault, the fault type can be divided into two types: internal component fault and power supply equipment fault: (1) the internal component fault of the inverter repair refers to the fault caused by the internal short circuit or line interruption of the inverter, this type of fault occurs in the interior of the electrical equipment, and is caused by its own reasons, will not be affected by the external environment, when this type of fault is presented, the inverter needs to be disassembled, and then find out the cause of the fault, so as to adopt the relevant treatment methods;
(2) The power supply equipment defect repaired by the inverter refers to the problem of the power supply part of the inverter, that is, the power supply system presents a fault and then makes it unable to operate, and this type of fault is relatively simple to deal with.
There is also the difficulty of finding inverter faults, which can be divided into two types: overt and recessive:
(1) The obvious fault of inverter repair refers to the fault that can be found after visual investigation of the inverter, which is generally accompanied by the change of the appearance of the equipment, so it is relatively simple to find the cause of the fault and adopt the treatment method;
(2) The hidden fault of inverter repair refers to the problem that can not be found by the naked eye and can only be found by the testing instrument, this type of problem is not only difficult to find, but also difficult to study the cause of the problem, and it is difficult to adopt the treatment method in time.
|
More on that
|
The output side of the inverter is equipped with a contactor - Sunland inverter
When the power supply and the inverter are replaced, for example, if the inverter has a problem, in order to make an emergency, let the motor be directly changed to be driven by the power frequency power supply; Perhaps the inverter is used for soft starting, and after the motor is accelerated to the power frequency speed, it is changed to be driven by the power frequency power supply.
...
|
|
Introduction of Sunland inverter
1. Obtain accurate motor parameters from low to high parameters at different frequencies, and establish motor models of corresponding frequency bands in different frequency segments, so that the inverter can control the motor from low to high.
2. V/F control
(1) It is possible to select 15 pre-set V/...
|
|
Inverter selection according to capacity matching - Senlan
We need to ensure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct type of inverter is selected. The general principle is what nature of the load characteristics with what characteristics of the inverter.
(1) Constant torque production equipment - in the speed regulation range ...
|
|
The harm of low temperature to the inverter - Senlan
Most VFDs are suitable for -10°C-50°C, and if the temperature is too low, the VFD will be affected.
Precautions for low-temperature operation of VFD:
1. VFD should be operated in an environment above minus 10°C as much as possible, preferably indoors.
|
|
Effect of inrush current on inverter - Senlan
In the process of repairing the inverter, we can find that because of the back electromotive force in the stator winding, the electromotive force in the synchronous generator state and the self-induced electromotive force in the self-loop rotor, the current impact will inevitably have a negative impact on the motor, the inverter (Variable-frequency ...
|
|
The comprehensive application of Sunland's high-power boiler feed pump has added another classic
Recently, the "General Contracting Project of Boiler Feed Pump Frequency Conversion Technology Transformation Project of Yili Power Plant of Guoshen Group" undertaken by Hope Sunland has been successfully implemented and connected to the grid, adding another classic to the comprehensive application of Sunland's high-power boiler feed pump.
In 2020 ...
|
|
The inverter is regularly replaced with the device - Sunland inverter
1. Cooling fan
As a prerequisite for ensuring the normal operation of the inverter, efficient and fast in-line cooling fans have become an indispensable conversion configuration of the inverter. Because of the wear of the internal bearings of the cooling fan and the reduction of the grease function in the process of application, the cooling of the fan.
|
|
Repair and maintenance of Sunland inverter
The input and output currents of the inverter contain many higher harmonic components. In addition to the lower harmonics that can constitute the reactive power loss of the power supply, there are many harmonic components with high frequencies. They will transmit their own energy in various ways, forming a positive impact on the inverter itself and other equipment.
|
|
Inverter rectifier unit static detection mode
The method of judging the damage of a power element in the rectifier part is to manipulate the single conductivity of the rectifier element, and the positive and negative resistance values should not be consistent when the static value is general, and the specific method is as follows:
The three-phase bridge rectifier of the rectifier part may be two...
|
|
Characteristics of two-phase electric fan inverter - Sunland inverter
The digital signal processor is selected, and the work efficiency is higher
A good quality two-phase electric fan inverter uses a digital signal processor, which can make the work efficiency higher, that is, it may take 3 hours to complete the work, but now it only takes 2 hours to be able to...
|
|
Advantages of choosing a frequency converter
Advantage 1: Energy saving
The motor adopts frequency converter speed regulation, and its power can be improved by 5%-10%.
The inverter accounts for 20%-30% of the total capacity of the communication motor in the drag of load equipment such as fans, pumps, extruders, mixers, etc., which has a significant energy-saving effect, because the consumption of the fan and water pump is significant.
|
|
Common brand inverter modification power method - Senlan inverter
What are the advantages of inverter power correction? Many brands of inverter power boards, driver boards, and motherboards can be universal, as long as the type, volume, and hardware are the same, and the desired power and voltage value can be obtained by correcting the manufacturer's parameters.
...
|
|
How to choose an inverter - Hope Sunland
The selection of the inverter should be considered according to the type of controlled object, speed regulation scale, static speed accuracy, starting torque, etc., so that it can be easy to use and economical together with meeting the process and production requirements. According to the different forms of devices, it can be divided into four types, which can be divided into four types according to the controlled motor power and field device ...
|
|
How to expand the application range of inverter - Sunland inverter
In the electrical profession, the use and development of energy-saving frequency conversion is very good, which has promoted the electrical profession to reach the pinnacle of science and technology again. Frequency converter (VFD) has a very good development shape in China, but it still has to withstand various tests. As long as you give full play to your professional advantages, you can gain a firm foothold in this society. VFD ...
|
|
Common problems in the use of inverter - Sunland inverter
1. Please explain the maintenance function of the inverter?
(1) After detecting the abnormal situation, the correction action will be carried out automatically, such as overcurrent loss rate prevention, regeneration overvoltage stall prevention.
(2) After detecting the abnormality, the PWM control signal of the power semiconductor device is closed, so that the motor can park automatically. As...
|
|
Suppression method of electromagnetic interference of inverter - Sunland inverter
The operating principle of the inverter determines that it will have a certain disturbance, which may bring EMC (electromagnetic compatibility) problems to the equipment or system, and the inverter, as an electronic device, will also be affected by external electromagnetic disturbance.
Below...
|
|
The main step of inverter debugging - Sunland inverter
Investigation of the function of the inverter system
Before debugging the frequency converter, it is necessary to carefully read the operation instructions and related information of the inverter to be debugged to understand the application environment and precautions. Especially before the inverter is energized, it is necessary to carefully observe and see if the inverter has obvious problems.
|
|
The servo motor is connected to the wrong wire and causes a problem - Senlan
If the three power cables of the servo motor (SM) are not connected correctly, there may be no alarm in the static state. But as soon as the motor is operated manually or actively, the motor jumps off or starts to flutter, such as jumping when the speed is added too high, the system will issue generalized faults, etc.
|
|
The inverter has an overvoltage phenomenon - Sunland inverter
Inverters often encounter a variety of problems during commissioning and use, during which overvoltage is the most common. After the overvoltage occurs, in order to avoid damage to the internal circuit, the overvoltage protection function of the inverter will work, so that the inverter will operate intermittently, resulting in the equipment can not be ...
|
|
Application of Sunland inverter on gantry milling machine
The gantry milling machine is a machining equipment for processing larger workpieces, and its electrical control system includes two parts: the main transmission of the workbench and the logical control of the feed organization. Henan Jiaozuo Maike Company has a gantry milling machine, which has been used for many years since the 70s. The main drive of the operating table of the gantry milling machine is selected ...
|
|
Contact
working hours
