3BSE022457R1 ABB

The connection method of the shielded wire of the PLC and the inverter shall comply with the following principles:

⒈The shielded wire should be as close as possible to the end with the lowest potential.It can be understood in this way.Generally,we think that the ground potential is”0″.In fact,if there are two ground terminals,there will be a potential difference between the two ground terminals at a certain time.There will be current flowing between the two connection wires,which is also a kind of interference.

⒉In practical applications,if the place where the control cable passes is complicated and requires multi-terminal grounding,we generally cut the shielding layer and ground it in different places.Compared with the factory control equipment,the shielding layer of the communication cable is grounded in this way.

PLC和变频器屏蔽线的接法遵守下面的原则：

⒈屏蔽线尽量靠尽电势低的一端，可以这么理解，一般我们认为地电势为“0”，而在事实情况下，如有两个接地端，某一时刻两个接地端会存在电势差，在两个接电线之间将会有电流经过，这也是一种干扰。

⒉在实际应用中如果控制电缆经过的场所比较复杂需要多端接地的时候,我们一般采取割断屏蔽层,再不同的地方接地.较厂的控制设备通讯电缆屏蔽层接地也常采取这种方式。