The problem why the frame loss of the industrial camera occurs is indeed caused by the blockage of the material channel, so it is unable to be processed by the technology. Therefore, when the new images are collected, the former image might be forced to be abandoned, or the new image will probably be forced to be abandoned. Generally speaking, the frame loss of the industrial camera is not related to the transmission interface adopted by the industrial camera. For USB, 1394, GigE, or camera-link, the poorly designed driving program or industrial camera hardware is the true reason of frame loss. In order to solve this problem, the designers are required to conduct precision design to every link of the driving program and industrial camera hardware material transmission.
Blog
Industrial camera is a key component in the machine vision system. Its most essential function is to convert the optical signal into the ordered electrical signal of the small-size high-definition industrial camera. In the machine vision system, the lens of the industrial camera are equivalent to the eyes of human beings. Its main function is to focus the targeted optical images on the photo surface of the image sensor (industrial camera). All image information of the visual system treatment can be obtained from the lens of industrial camera. The lens quality of the industrial camera will directly affect the entire performance of the visual system. As an image device, the lens of industrial camera usually constitute a complete image collecting system with the power source and camera. Therefore, the lens selection of the industrial camera is restrained by the entire system requirement. Generally, it can be analyzed and considered as the following aspects.
In PLC control system, we mostly use DC proximity sensors. And in DC circuit, the proximity sensors used include 2-wire proximity sensor, 3-wire proximity sensor and 4-wire proximity sensor. And they can be further divided into NPN type and PNP type. Generally, people in the United States and Japan usually use NPN proximity sensor, while in the Europe use the PNP proximity sensor.
The difference of NPN proximity sensor and PNP proximity sensor lies in the conduction situation. NPN proximity sensor belongs to the low level conduction and PNP proximity sensor belongs to the high level conduction. In other words, signal of the NPN proximity sensor flows from the load to the proximity sensor, while that of the PNP proximity sensor flows from the proximity sensor to the load.
We will take FX3U PLC and S7-200 PLC as examples to explain how is the NPN proximity sensor and PNP proximity sensor connected to PLC.
Three phase asynchronous motor has many advantages, but also has two fatal weaknesses: one is the poor starting performance, the other is poor speed control performance. With the development of power semiconductor technology and application of high power transistors in industrial control field, two typical products greatly improve the two weaknesses of asynchronous motors: Variable Frequency Drive and Soft Starter. The VFD improves the speed control performance of asynchronous motors, while the soft starter improves the starting performance of asynchronous motors.
With various functions such as soft start, soft stop, pump control and timed low speed operation, the 3 phase motor soft starter has incomparable advantages over traditional reduced voltage starter in power equipment control in the industrial and civil construction fields.
When we get a pressure transducer, it's necessary to do detection for it. The easiest way to test a pressure transducer is to connect it to a display instrument directly. And check whether the display value changes with the pressure. If it is ok. We have to do further detection for the pressure transducer.
In the visual inspection of industrial machine, there are usually projects requiring to capture the objects in high-speed movement. However, the ordinary industrial camera will probably problems of vague or deformed pictures, thus failing to reach the project requirements of the customers. At this time, high-performance industrial camera is required to solve such problems. Then, we will illustrate it by taking the high-speed image capturing of the industrial camera as an example.
Generally, DCS system treats the current higher than 20.2mA or less than 3.8mA as a fault, and the pressure transducer also has fault current settings. For example, it can set the fault current of pressure transducer to 3.6mA or 22.8mA, or setting as needed and related to failure alarm setting. When the output current of pressure transducer is less than 4mA or greater than 20mA, it refers to the common saying that the instrument display is below zero or the instrument display is maximum. In this case, the fault is analyzed and judged in excess of the range. When checking the over-range fault of pressure transducer, firstly check the components related to the process, whether the process parameters have significantly changed, whether the instrument sampling valve and connecting pipes are normal, whether the connecting line or safety grille is faulty or damaged. Then check the pressure transducer itself, whether its range is selected correctly, whether the measuring diaphragm and circuit board break.
Solid state relay, SSR in short, is the non-contact switch constituted by the microelectronics circuit, discrete electron device and power electronics power device. The isolation device is used to realize the isolation of the control terminal and load terminal. The input terminal of the solid state relay adopts the tiny control signal, thus realizing the direct driving of the high-current load.
Then, we will mainly introduces the faults of the solid state relay burnout. How to test the SSR if it is damaged or not? What is the reason of the solid state relay burnout and how to deal with?
The lightning stroke discharging between the cloud layer and earth is constituted by one or several individual lightning. Every lightning carries several currents with very high amplitudes and short duration. One typical lightning discharging shall include two or three lightning. There is about an interval of 1/20 second between two lightnings. Most lightning currents drop in the scope of 10, 000~100, 000 Amp, and its duration is generally lower than 100ms.
Because of the operation of high-capacity equipment and frequency conversion equipment in the power supply system, an increasingly serious interior surge problems have been generated. We conclude it into the influence of transient overvoltage (TVS). Any power equipment has the allowed scope of power supply voltage. Sometimes, even very narrow overvoltage impact might damage the equipment power supply or entire equipment. The destructive effect of transient overvoltage (TVS) is just like this. In particularly, as to some sensitive microelectronics devices, some very low surge impacts will probably case fatal damage.
As the common part of the electrical device, both the surge protection device and lightning arrester have the function of preventing from over-voltage, especially preventing from the lightning over-voltage. However, the two have great differences.
- Different voltage level from the perspective of application field
- Different protecting objects
- Different insulation level or withstand voltage level
- Different installation position
Temperature sensor equipped for the temperature transmitter can be divided into thermocouple and RTD, and the RTD sensor can be divided into three kinds of 2-wire RTD, 3-wire RTD and 4-wire RTD. Despite of the differences mentioned above, measurements and principles of the temperature transmitter are the same. Now the indication error calibrating of ATO-S-TEMPT-ST500 temperature transmitter would be taken as example to analyze temperature transmitter calibration and errors in the process.
Inverter is a kind of transformer converting the low-voltage DC power (usually such as the power output by the battery) into the high-voltage AC high-frequency power (sine wave AC power of 220V 50Hz or 110V 60Hz). Take a 12V DC to 220V AC car power inverter as example to illustrate the working principle briefly. Firstly, the 12V low-voltage DC power in the vehicle is converted into the high-voltage DC power of around 265V, and then the 265V DC power is converted into the sine wave AC power of 220V, 50Hz. The main inner components of power inverter include the Inverter Bridge, filter circuit, oscillator, control logic circuit and so on. At present, a large amount of various power inverters are filled in various e-commerce platforms. The cheapest one is only tens of dollars, but the expensive ones can cost several hundreds or even one thousand dollars. The maximum power it sustains range from dozens of wattages to several hundreds of wattages. Then, what kind of power inverter can we choose?
In our load cell product pages, when we introducing the load cells, we often say that you can buy a transmitter/amplifier with a customized output signal (0-5V, 0-10V, 4-20mA) to output standard signal to PLC, DCS and other control systems. Then someone will ask us how to connect load cell to plc. Now today we will explain the connection methods of load cell in details. When forming the weighing and batching control system with PLC, there are four connection methods for load cell.
Reactor is used to maintain the current and stabilize the voltage of the electrical system. The reactor adopted in the power grid is substantially a hollow coil without the permeability magnetic material. It can be arranged in vertical, horizontal and stagger assembling forms as the demand. When the electrical system has short circuit, the short-circuit current with high values will be generated. If it is not restricted, it is very difficult to maintain the dynamic stability and thermal stability of the electrical equipment. Therefore, in order to satisfy the interrupting capacity requirement of some disconnectors, reactors are usually connected in the outgoing breaker in series, so as to increase the short-circuit impedance and limit the short-circuit current.
As to the ripple wave of the switching power supply, it certainly exists both theoretically and practically. Generally speaking, here are some approaches restraining or reducing it.
Reducing EMI - diode back connection inductance
The metal shell can be adopted as the shield which is used to reduce the radiated interference of the external electromagnetic field. In order to reduce the electromagnetic interference of the power line input, the power input terminal is equipped with the EMI power line filter, just as the below diagram shows (EMI filter is also named as the power line filter). This is also a method usually used to restrain the high-frequency noise.
The main function of DC reactor is to reduce the higher harmonic components of the input current, improve the power factors of the input power source, and limit the short-circuit current. Before the DC reactor is connected with the filter capacitor, it hinders the impulse current amplitude entering the capacitor, and reduces the AC impulse of the busbar. When the power of the frequency converter is higher than 22kW, it is suggested to consider the application of DC reactor. The greater the power of the converter is, there should be a higher possibility of using the reactor. Because when there is no DC reactor, the capacitor filtering of the frequency converter will result in the serious distortion of the current wave, thus further causing the serious distortion of the network voltage waveform. In addition, it is very harmful to the service life of the rectifier bridge and filter capacitor of the frequency converter.
Proximity sensor belongs to the non-contact static position switch. When an object approaches it at a certain distance, the proximity switch gives an action signal. Different from the mechanical position switch that needs to be applied with mechanical force, the proximity switch acquires signal by the change of medium energy between the probe and the object under test. The proximity switch is widely used and has exceeded its scope of limit and protection, and common applications include speed measurement, liquid level control, and metal detection. When you are going to buy a proximity sensor but without any suggestion of others, you will be clear after reading this article.
Installation quality of load cells is decided by horizontal and vertical placement and height adjustment. In many use scenarios of electronic weighing instruments, it is observed that some weighing instruments are not bought from one professional manufacturer but from different manufacturers. Due to a lack of overall consideration, these weighing instruments might easily encounter different problems, including installation process, requirements of bolts and place limiting stopper.
Pancake load cell is also known as low profile load cell, because it has a low profile design and it looks like a pancake. On the other hand, pancake load cell can bear both tension and compression force. So it is also a tension and compression load cell that is widely used for platform scale, truck scale, rail weighbridge and tension tester.
A power inverter or inverter plays a role in converting the DC power from batteries to AC power for charging most appliances. According the output wave forms, it can be mainly divided into modified sine wave inverters and pure sine wave inverters. Then, what are the differences between them?
A modified sine wave inverter outputs waveform that has a time interval from the maximum value in the positive direction to the negative value in the negative direction. That means, the waveform is still composed of broken lines, thus without good continuity. However, pure sine wave inverters can output stable true sine wave power as good as the one from the grid we use every day, without electromagnetic pollution. However, the pure sine wave inverter can output stable true sine wave power as good as the one from the grid we use every day, without electromagnetic pollution. It works higher efficiently, suitable for all kinds of loads. The pure sine wave inverter can be applied for common appliances and devices without interference.
