46
Fig. 3-30 Grounding diagram 4
In addition, please pay attention to the following points:
·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 resistance of the flat cable is smaller
than the round cable of the same cross section area.
·
For the 4-core motor cables, one piece of cables should be grounded at the drive side, with the other end
connected to the motor grounding end. It would be better if the motor and drive have dedicated grounding
pole.
·If the grounding ends of the system components are connected together, the leakage current will become a
noise source and affect the equipment in the system. Therefore, the grounding end of the drive shall be kept
away from the grounding ends of the audio equipment, sensor and computer.
·To reduce the high-frequency impedance, the fixing bolt of the equipment can be used as the high-frequency
terminal for connecting to the back plate of cabinet. Note 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 to the drive
as possible.
The grounding cable should be kept away from the I/O cables of the noise-sensitive equipment and be as
short as possible.
3.3.4 Installation requirement for relay, contactor and electromagnetic braking
unit
For the devices that will generate large noise, such as the relay, contactor and electromagnetic braking unit,
even when they are installed outside the drive enclosure, surge suppressor must be installed.
Drive Other
equipment
PE
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