Fonrich FR-DCMG-MMPS, Руководство пользователя

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6
Ground connection and RS485 communication shielded wire
The FG terminal of the FR-DCMG must be grounded, otherwise communication will interfere and the
reliability of the device will decrease. The grounding wire should be grounded nearby. The grounding
wire should be no more than 15cm from the “FG” terminal to the bottom of the combiner box. It is
recommended to be within 10cm. The shorter the better, the thicker the better. The bottom of the
combiner box should be connected to the ground. The main control unit module is fixed on a
standard guide rail with a width of 3.5 cm.
The wiring specifications of the communication shielded wire are shown in the figure above:
The wiring of on-site communication lines requires that the communication shield can only be
grounded at a single point, otherwise there will be a risk of lightning surge damage to all equipment
on the entire communication line during a lightning strike;
If you encounter a situation where communication line interference is too large to communicate, you
can refer to the figure above, and insert a high voltage capacitor C <100nF between the shielded
wire of each combiner box and the ground wire, and use this capacitor to filter the shielding layer
interference.