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3HAC021905-001
3HAC021905-001
3HAC021905-001
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but also electric man, then under the premise of scheme 1, an inductive surge filter is added to the input power supply of the converter. And connect the ground of the induction surge filter to the ground of the motor and the ground of the inverter (as shown in the red line in Fig. 4) so that the induction surge filter can absorb and discharge the induction electricity of the motor again, the induction voltage is further reduced to prevent the current leakage of electric current. The circuit principle of the induction surge filter is the same as the surge filter inside the converter, because it is too big to be designed and installed inside the converter, so it is made as an external connection. It has been proved by a large number of experiments that the induction voltage produced by motor operation can be reduced to less than 20V under the application situation without ground wire connected to power supply through the on-site rectification of scheme 2, to ensure the safety of the field operators, there will be no electric leakage of the feeling of people. However, option 2 if there is connected to the power line to the ground, then there is no external induction surge filter can be. In addition, if there are more than one frequency converter to control the operation of the motor and it is not convenient to install more than one induction surge filter, it is not necessary to require each converter to be equipped with an induction surge filter, it is also possible to connect only one or two inductive surge filters and connect the earthing end of the filter with the earthing end of several frequency converters, the earthing end of the field motor and the equipment frame, as shown in figure
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