ET/EP/EH Series Intelligent Flexible Driver Manual
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Cable shielding layer
is connected to the
case at the outlet
Figure A-10 Radiation Suppression of the Cable Shielding Layer Connected to Ground of the
Shielding Case
A.7 Guide to the use of power line filter
Power line filter can be used for the equipment that can generate strong interference and the
equipment that is sensitive to external interference.
A.7.1 Function of power line filter
(1) The power line filter is a bidirectional low-pass filter, which only allows the pass-through of
DC and 50Hz power current, and does not allow the pass-through of electromagnetic
interference current with higher frequency. Therefore, it can not only prevent the
electromagnetic interference generated by the equipment itself from entering the power line,
but also prevent the interference on the power line from entering the equipment.
(2) The power line filter can enable the equipment to meet the requirements for electromagnetic
compatibility standards on conducted emission and conduction susceptibility, and it can also
suppress the radiation interference of the equipment.
A.7.2 Precautions for power line filter installation
(1) In the cabinet, the filter should be installed at a position as close as possible to the inlet of the
power line, and the power input line of the filter should be as short as possible in the control
cabinet.
(2) If the input line and output line of the filter are laid too close to each other, the high frequency
interference will directly couple the filter bypass through the input and output lines of the
filter, making the power filter ineffective.
(3) There is usually a special grounding terminal on the shell of the filter. However, if the
grounding terminal of the filter is connected to the cabinet shell with a wire, the long wire will
not play an effective bypass role due to its high frequency impedance, then the filter will be
useless. The correct installation method is to stick the filter shell on the conductive plane of
the metal housing, to make the contact area as large as possible. Pay attention to the removal
of insulating paint during installation to ensure a good electrical contact.
A.8 Division of EMC installation area of the inverter
In the transmission system composed of inverter and motor, the inverter and the peripheral devices
such as control devices and sensors are usually installed in the same control cabinet. The interference
caused by the control cabinet to the outside of the cabinet can be suppressed by taking measures at
the main contact, so a radio noise filter and an incoming AC reactor should be installed at the
incoming terminal of the control cabinet. In order to meet EMC requirements, electromagnetic
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