ET/EP/EH Series Intelligent Flexible Driver Manual
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motor and inverter are equipped with their own dedicated grounding electrodes, the best
grounding performance can be achieved.
(4) When the grounding terminals of all components in the control system are connected together,
the noise source formed by grounding leakage current will affect other peripheral devices
other than the inverter in the control system. Therefore, in the same control system, the
grounding of the inverter should be separated from that of weak current equipment such as
computer, sensor or audio equipment to avoid connection together.
(5) In order to obtain lower high-frequency impedance, the fixing bolts of each equipment can be
used as the high-frequency terminals connected to the back panel of the cabinet. Please pay
attention to removing the insulating paint at the fixing points during installation.
(6) The grounding cable should be laid far away from the wiring of I/O part of noise-sensitive
equipment, and the ground cable should be as short as possible.
A.4 Installation of surge absorber
A large number of noise-producing devices such as relays, contactors and electromagnetic brakes
must be equipped with surge suppressors even if they are installed outside the inverter chassis, as
shown in Figure A-7.
Figure A-7 Requirements for the Use of Relays, Contactors and Electromagnetic Brakes
A.5 Leakage current and its countermeasures
The leakage current flows through the line capacitance and motor capacitance at the input and output
sides of the inverter, including earth leakage current and line-to-line leakage current, as shown in
Figure A-8. The magnitude of leakage current depends on the carrier frequency and the capacitance.
Figure A-8 Leakage Current Path
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