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The grounding wire of the motor shall be grounded at the drive side. The motor and the drive shall be
separately grounded.
The motor cable and control cable should use shielded/armoured cable. The shielding metal mesh shall be
connected to the both ends of the grounding cable through cable clamps to avoid the twisting of the ends of
the metal mesh, because in this case, the shielding effect will be affected in the high-frequency conditions.
The conductivity between the mounting plate, the mounting screws and the drive metal enclosure shall be
ensured. Teeth paint scraping and conductive mounting plate shall be used.
If there is any sensitive device, separate power filter can be installed at the sensitive device side to reduce the
cost.
3.3.7 Operation instructions for power filter
Power filter shall be used for the device that can generate strong interference and the device sensitive to
external interference. The power line filter is a two-way low-pass filter. It allows the DC or 50Hz industrial
frequency current to pass, but does not allow the high-frequency electromagnetic current to pass.
Role of the power line filter
It can help the device meet the EMC requirement on conduction emission and conduction sensitivity and
contribute to suppressing the radiation emission of the device.
It can prevent the electromagnetic interference of the device from entering the power line, and the
interference of the power line from entering the device.
Common errors in the power line filter installation
1. Too long power input line
The filter shall be installed close to the power cable inlet of the cabinet, and the power input cable of the filter
shall be as short as possible in the cabinet.
2. The input cable and output cable of the power cable filter are too close to each other
If the input cable and output cable of the filter are too close to each other, the high-frequency interference
signal will be directly coupled through the input and output cables of the filter and bypass the filter, making the
filter useless.
3. Poor filter grounding
The filter enclosure must be reliably connected to the metal enclosure. There is a dedicated grounding
terminal on the filter enclosure. However, if the filter is connected to the metal enclosure through a cable, it is
useless for the high-frequency interference signal, because the resistance of the long cable (which is not the
resistance of the resistor) is very large, making the bypass ineffective. The correct installation method is to
directly install the filter enclosure against the conducting surface of the equipment metal enclosure, with the
relevant insulating paint removed.
3.3.8 Drive radiation emission
Because of the working principle of the drive, is unavoidable for the drive to emit radiation. The drive is
generally installed in the metal enclosure, and thus has little radiation influence on the instruments and
equipments outside the metal enclosure. The external connecting cable is the main source for radiation
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