Phoenix Contact SCK-M-U-1500V Handleiding (128 Pagina's)

Handleiding

Installation

105608_en_01 PHOENIX CONTACT 45

Shielding and correct connection of the shield have a considerable effect on the signal qual-

ity of data cables in photovoltaic systems. In order to prevent inductive interference cou-

plings by the PV power cables, the shield should be connected at both ends.

Example:

Figure 6-2 Influence of shielding on the signal quality

The left shows the differential signal (V) and the data quality (D) with shielding at both ends;

the right shows a differential signal affected by inductive interference coupling. Communi-

cation is error-prone or not even possible. The device could be destroyed.

Consider the cable routing when installing the data cables: never install the data cables (D)

parallel to the power cables (P). If crossovers are unavoidable, data cables and power ca-

bles must cross at a right angle.

Table 6-2 Minimum distances between data cables and power cables

Separation distance (s) at 50 Hz

Power (power

cable)

Without cable

duct

Open metal cable

duct

Perforated cable

duct

30 A 0.06 m 0.05 m 0.03 m

120 A 0.24 m 0.18 m 0.12 m

300 A 0.6 m 0.45 m 0.3 m

600 A 1.2 m 0.9 m 0.6 m

V

D

t

B

A

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