Lightning strike is divided into direct lightning and inductive ray. Direct thunderbolt is the lightning bolt that falls directly on the lightning, causing the maximum damage; Inductive thunder is an electromagnetic wave generated by lightning that produces high voltage on the conductor, causing the electrical overvoltage on the conductor to be damaged. On the grid, a multistage arrester has been installed, but the lightning induction voltage near the residual voltage of the front lightning or the converter is still causing damage to the frequency converter.
Answer: Install an inlet arrester in the converter control cabinet.
The power lightning arrester can be used for lightning protection module, slide installation and parallel grounding. The arrester module is the gap discharge, the impact discharge current 15kA(10/350 mu s) and the working voltage of 250V. It can also be used to prevent lightning by using parallel voltage sensitive resistance on power line.
The input of the overvoltage will cause tripping, or even damage inverter internal circuit.
Yes, but not the accuracy of the servo controller.
Yes, the input frequency range of the INVT inverter is 47-63Hz.
Single-phase 220V inverter can only be output in the 3-phase 0~ 220V, and the inverter itself is not to be promoted.
Ordinary motor can realize variable frequency control. However, it is not recommended to use low frequency (below 30HZ) for a long period of time.
The protection level of the frequency converter is generally IP20 (the protection level of CHV110 is IP54).
IP (INTERNATIONAL PROTECTION) PROTECTION grade system is drafted by IEC (INTERNATIONAL ELECTROTECHNICALCOMMISSION). The electric appliance is classified according to the characteristics of dust and moisture proof. The IP protection level is composed of two Numbers. The first number represents the level of the electrical appliances from the dust and prevents the invasion of foreign objects, namely the protection of foreign solid objects. The second digit indicates the density of the electrical protection against moisture and waterproofing intrusion. The larger the number indicates the higher the protection level, the better the protection of water.
The level of protection indicated by two signs is shown below.
When the inverter is not used, the leakage current is generally small. When using the inverter, as the power module of the inverter is high speed switch, the output current has the existence of high harmonics. There is a sense of inductance between the cable and the ground and the cable, resulting in a large leakage current (which can be up to 10 times less than the frequency inverter).
According to the inverter power consumption of 4%, the airtight space has several air conditioners, high-power machines, low-voltage low-power self-equipped fans to maintain good ventilation.
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