Sma 485 Data Module Type B Manuel d'utilisateur télécharger pdf (Page 14)

5 Electrical Connection SMA Solar Technology AG

14 485BRD-10-IA-en-12 Installation Manual

5.4 Preparing the Cables

Requirement:

☐ The cable requirements are complied with (see Technical Description "RS485 Cabling Plan").

☐ Diameter of the cable when using the cable support sleeve with one hole: at maximum 17 mm

☐ Diameter of the cable when using the cable support sleeve with two holes: at maximum 6.5 mm

Depending on whether the inverter is located at the end or in the middle of the communication bus,

prepare one or two cables as described in the following:

1. Remove 40 mm of the cable sheath at the end of the cable to be connected to the

485 data module.

2. Shorten the cable shield to 15 mm.

3. Fold the surplus cable shield back onto the cable

sheath.

4. Wrap the cable shield with copper foil.

5. Strip the insulation on the three wires each by 6 mm. Two wires for communication must be a

twisted pair.

6. Shorten all other wires flush with the cable sheath.

Disturbance of data transmission due to AC cables

During operation, AC cables generate an electromagnetic field which may induce interference

in plant communication.

• Do not lay the cables of the RS485 communication together with the AC cable.

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Sma 485 Data Module Type B Manuel d'utilisateur Page 14