Frequency converter environment - Solutions - Huaqiang Electronic Network

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

High frequency probe high frequency line can be customized other specifications

SMD aluminum electrolytic capacitor

Physical environment

1) Working temperature. The inside of the inverter is a high-power electronic component, which is highly susceptible to the operating temperature. The product is generally required to be 0 to 55 ° C. However, in order to ensure safe and reliable operation, consideration should be given to leaving room for use. It is best to control below 40 ° C. . In the control box, the inverter should generally be installed in the upper part of the cabinet, and strictly follow the installation requirements in the product manual. It is absolutely not allowed to install the heating element or the heat-prone component close to the bottom of the inverter.

2) Ambient temperature. When the temperature is too high and the temperature changes greatly, the inside of the inverter is prone to condensation, and its insulation performance is greatly reduced, and may even cause a short circuit accident. If necessary, desiccant and heater must be added to the tank.

3) Corrosive gases. If the concentration of corrosive gas is large, it will not only corrode the leads of the components, printed circuit boards, etc., but also accelerate the aging of the plastic devices and reduce the insulation performance. In this case, the control box should be made into a closed structure. And ventilate.

4) Vibration and shock. When the control cabinet equipped with the inverter is subjected to mechanical vibration and shock, it may cause poor electrical contact. At this time, in addition to improving the mechanical strength of the control cabinet, away from the vibration source and the impact source, the anti-vibration rubber pad should also be used to fix the vibration-generating components such as the control cabinet and the internal electromagnetic switch. After the equipment has been in operation for a period of time, it should be inspected and maintained.

1) Prevent electromagnetic interference. Due to the rectification and frequency conversion, the inverter generates a lot of interference electromagnetic waves around the inverter. These high-frequency electromagnetic waves have certain interference to nearby instruments and instruments. Therefore, the instrument and electronic system in the cabinet should use a metal casing to shield the inverter from interference with the instrument. All components should be grounded reliably. In addition, shielded control cables should be used for wiring between electrical components, instruments and meters, and the shielding layer should be grounded. If the electromagnetic interference is not handled well, the whole system will not work, resulting in failure or damage of the control unit.

2) Prevent the input terminal from overvoltage. The input end of the inverter power supply often has over-voltage protection. However, if the high-voltage input time of the input terminal is long, the input end of the inverter will be damaged. Therefore, in actual operation, it is necessary to verify the input voltage of the inverter, single-phase or three-phase and the rated voltage of the inverter. In particular, when the power supply voltage is extremely unstable, there must be a voltage stabilizing device, otherwise serious consequences will result.

Grounding the inverter properly grounding is an important means to improve the sensitivity of the control system and suppress the noise. The grounding resistance of the grounding terminal E(G) of the inverter is as small as possible. The cross-sectional area of ​​the grounding conductor should be no less than 2mm2 and the length should be controlled within 20m. The grounding of the inverter must be separated from the grounding point of the power equipment and cannot be grounded. The shield of the signal input line should be connected to E(G), and the other end must not be connected to the ground. Otherwise, the signal will fluctuate and the system will not oscillate. The inverter and the control cabinet should be electrically connected. If the installation is difficult, the copper core wire can be used for bridging.

Lightning protection In the frequency converter, there is generally a lightning absorption network, which mainly prevents instantaneous lightning intrusion and damages the frequency converter. However, in actual work, especially when the power line is introduced overhead, the absorption network of the inverter alone cannot meet the requirements. This problem is particularly important in areas where lightning is active. If the power supply is overhead, install a special lightning arrester (optional) at the incoming line, or pre-buried the steel pipe at a distance of 20m from the inverter according to the specifications. Ground protection. If the power supply is a cable entry, the lightning protection system of the control room should be well protected against lightning damage. Practice shows that this method can basically solve the lightning strike problem effectively.