When the peripheral equipment and the inverter share the same power supply, the disturbance generated by the inverter is transmitted against the power line, which will cause other equipment in the same system to malfunction. The following methods can be adopted:
(1) The input end of the inverter is equipped with an EMI filter or a ferrite common-mode filter (magnetic ring).
(2) Other equipment is blocked by blocking the noise with a barrier transformer or power filter.
Motor line radiation Power line radiation Inverter radiation The equipment or signal line that measures weak signals such as appearances, radio devices, and sensors is installed in the same cabinet as the inverter, and the wiring is very close, and it is simply disturbed by the space to produce malfunction, and the following countermeasures need to be taken:
(1) Simply affected equipment and signal lines should be kept away from the inverter device as much as possible. The signal line should be shielded wire, the shield layer should be grounded, the signal line cable should be sleeved into the metal pipe, and should be as far away as possible from the inverter and the input and output lines of the inverter. If the signal cable has to cross the power cable, it must be perpendicular to the two.
(2) Separation device EMI filter or ferrite common-mode filter (magnetic ring) on the input and output side of the inverter.
(3) The motor cable should be placed in a barrier of a larger thickness, such as a pipe of a larger thickness (more than 2mm) or buried in a cement tank.
The power line is sleeved into a metal tube and shielded to the ground (the motor cable is a 4-core cable, one of which is grounded on the inverter side and the motor housing on the other side).
(1) Prevent the signal line and the power line from being routed in parallel or bundled with the power line.
(2) Keep the simply affected equipment or signal lines as far away as possible from the inverter and the input and output lines of the inverter.
(3) The signal line and power line are shielded wires, and the metal pipes are separated from each other, and the distance between the metal pipes is at least 20cm.
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