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In addition, pay attention to the following notes:
To minimize the impedance of different grounding systems, the standard grounding cable of largest size shall be
adopted. The flat cable is preferred, because the high-frequency impedance is smaller than the round cable of the
same cross sectional area.
One end of the 4-core motor cable should be grounded at the drive side, and the other end should be connected to
the motor grounding end. It is much better if the motor and drive have the dedicated grounding pole.
If the grounding ends of the system are connected together, the leakage current will become a noise source and
affect devices in the system. Therefore, the grounding end of the drive should be separated from the grounding ends
of audio equipment, sensors, computers, and so on.
To obtain low high-frequency impedance, the fixing bolt of the equipment can be used as the high-frequency
terminal connected to the back plate of the cabinet. Remember to scratch off the insulation paint of the fixing point.
The grounding cable should be as short as possible, that is ,the grounding point shall be as close as possible to the
drive.
The grounding cable should be kept away from the I/O cables of noise-sensitive equipment and be as short as possible.
4.3.4 Installation of relay, contactor and electromagnetic brake
For devices generating large noise, such as the relay, contactor and electromagnetic brake, even though they are
installed outside the drive enclosure, the surge suppressor must be installed.
Fig. 4-33 Installation requirements for relay, contactor and electromagnetic brake
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