Inverter maintenance electrical environment 1) Prevent electromagnetic interference. Due to the rectification and frequency conversion in the work of the inverter, a lot of interference electromagnetic waves are generated around the frequency converter. These high-frequency electromagnetic waves have certain interference with nearby instruments and instruments. Therefore, cabinets and electronic systems should use metal enclosures to shield the inverter from interference with the instrument. All components should be reliably grounded. In addition, shielded control cables should be used to connect all electrical components, instruments and meters, and the shield should be grounded. If the electromagnetic interference is not handled well, the entire system will often fail to work, causing the control unit to malfunction or be damaged.
2) Prevent input overvoltage. Inverter power supply input often has over-voltage protection, but if the input high voltage for a long time, it will cause the inverter input damage. Therefore, in actual application, it is necessary to verify the input voltage of the inverter, single-phase or three-phase, and use the rated voltage of the inverter. Especially when the power supply voltage is extremely unstable, there must be voltage regulator equipment, otherwise it will cause serious consequences.
Grounding The correct grounding of the inverter is an important means to improve the sensitivity of the control system and to suppress the noise. The grounding resistance of the grounding terminal E (G) of the inverter should be as small as possible. The cross-sectional area of ​​the grounding conductor should be no less than 2mm, and the length should be controlled within 20m. The grounding of the frequency converter must be separated from the grounding point of the power equipment and cannot be common ground. The shielding layer of the signal input line should be connected to E(G), and the other end must not be connected to the ground. Otherwise it will cause fluctuations in the signal and cause the system to oscillate. The frequency converter and the control cabinet should be electrically connected. If the actual installation is difficult, they can be bridged by copper conductors.
2) Prevent input overvoltage. Inverter power supply input often has over-voltage protection, but if the input high voltage for a long time, it will cause the inverter input damage. Therefore, in actual application, it is necessary to verify the input voltage of the inverter, single-phase or three-phase, and use the rated voltage of the inverter. Especially when the power supply voltage is extremely unstable, there must be voltage regulator equipment, otherwise it will cause serious consequences.
Grounding The correct grounding of the inverter is an important means to improve the sensitivity of the control system and to suppress the noise. The grounding resistance of the grounding terminal E (G) of the inverter should be as small as possible. The cross-sectional area of ​​the grounding conductor should be no less than 2mm, and the length should be controlled within 20m. The grounding of the frequency converter must be separated from the grounding point of the power equipment and cannot be common ground. The shielding layer of the signal input line should be connected to E(G), and the other end must not be connected to the ground. Otherwise it will cause fluctuations in the signal and cause the system to oscillate. The frequency converter and the control cabinet should be electrically connected. If the actual installation is difficult, they can be bridged by copper conductors.
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