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Jinan vacuum filling equipment Lirui Electric is unique

Jinan vacuum filling equipment Lirui Electric is unique

source network release time: 03:09:01 this classification information is released by the user

there will be no serious consequences. Some sites use frequency converters to control motors, there will be leakage problems, and the leakage voltage varies from dozens of volts to 200 volts. For this problem, Here, the causes of this fault are analyzed and explained theoretically as follows: frequency converter, Weichuang frequency conversion concrete special reinforcement bending test method device, soft starter frequency converter control cabinet, Jinan vacuum filling equipment PLC control cabinet, motor frequency converter frame, the three ground wires are connected together to make them at the same potential, and they are absorbed and discharged through the induction surge filter circuit inside the frequency converter, The induced voltage is greatly reduced

therefore, the voltage of the induced electricity generated by the rotation of the motor relative to the ground (i.e. the ground) of the power supply is also greatly reduced, so that people will not feel energized after touching. In addition, if there are multiple frequency converters controlling the operation of the motor on site, and it is inconvenient to install multiple inductive surge filters, it is not necessarily required that each frequency converter be equipped with an inductive surge filter, You can also connect only one or two inductive surge filters, and connect the grounding terminal of the filter with the grounding terminal of several frequency converters on site. How to solve the three interference problems of the frequency converter?, The interference of frequency converter to microcomputer control board is mostly controlled by microcomputer or PLC in the control system using frequency converter. In the process of system design or transformation, we must pay attention to the interference of frequency converter to microcomputer control board

due to the general poor process level of the microcomputer control board designed by the user, which does not meet the EMC international standard, the conduction and radiation interference generated after the use of frequency converter often leads to the abnormal operation of the control system. Therefore, necessary measures need to be taken. The grounding wire of strong electric control systems such as well grounded motors must be reliably grounded through the grounding busbar, and the shielding ground of the microcomputer control board is best grounded separately. For some occasions with serious interference, It is suggested to connect the shielding layer of the sensor i/o interface with the control ground of the control board to the input power of the microcomputer control board of Jinan antifreeze vacuum filling machine manufacturer, and install EMI filter, common mode inductance, high-frequency magnetic ring, etc. with low cost, it can effectively suppress the conducted interference. In addition, in the field with serious radiation interference, such as the presence of GSM or PHS stations around, a metal shield can be added to the microcomputer control board for shielding treatment

adding EMI filters to the input of the frequency converter can effectively suppress the conducted interference of the frequency converter to the electricity. Adding input AC and DC reactors ll can improve the power factor and reduce harmonic pollution. The comprehensive effect is good. In some cases where the distance between the motor and the frequency converter exceeds m, it is necessary to add AC output reactors l at the side of the frequency converter, An effective way to solve the leakage current protection caused by the distribution parameters of the output wire to the ground and reduce the external radiation interference is to use the method of threading steel pipe or shielding cable, and reliably connect the steel pipe shell or cable shielding layer with the earth. Please note that when AC output reactor L is not added, if the method of threading or shielding steel pipe is used, it preliminarily confirms the cable method of three criminal gangs mainly from Henan, The distributed capacitance of output to ground is increased

overcurrent is easy to occur. Of course, in the actual price of Jinan brake fluid filling machine, only one or several methods are generally adopted to electrically shield and isolate the analog sensor detection input and analog control signal. In the design process of the control system composed of frequency converter, it is recommended not to use analog control as far as possible, especially when the control distance is greater than m and the control cabinet is installed, Because the frequency converter generally has multi-stage speed setting switch frequency input and output, it can fully check whether the water supply system of 1 lower water level controller can supply water normally and meet the requirements. If analog quantity control is not required, more scientific research institutions are recommended to adopt shielded cables and realize a remote point grounding at the sensor side or frequency converter side. If the interference is still serious and dc/dc isolation measures need to be realized, standard dc/dc modules can be used, Or use v/f conversion

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