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Avoid variable frequency drive damaged in lightning
Sometimes, lightning or lightning impulse voltage also will cause the variable frequency drive damaged. In addition, if the power supply system with a vacuum circuit breaker, short-circuit on/off will generate higher impact voltage. To avoid surge voltage causes overvoltage damaged, the general method is add varistor absorption on the variable frequency drive input side, and the vacuum circuit breakers should add RC surge absorber. If there is a vacuum circuit breaker on VFD, it needs to ensure the VFD drive disconnected first when the vacuum circuit breaker activate.
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