Sungrow SG250HX, User Manual

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Table 5-3 Power cable for tracking system
C Ca ab blle e
T Tyyp pe e
S Sp pe ec ciiffiic ca attiio on n
C Ca ab blle e
D Diia am me ett--
e err((m mm m))
R Re ec co om mm me en nd de ed d
C Crro ossss--sse ec cttiio on na all
a arre ea a((m mm m
2 2
))
V Vo olltta ag ge e lle evve ell
Power
cable
for
tracking
system
Double-core
outdoor
copper cable
4.5~18 4~6*
Consistent with
selected AC cable
*Only when the cable cross-sectional area ranges between 4mm
2
and 6mm
2
, the
supplied OT terminals can be used. If otherwise, users should prepare M12 OT terminals
by themselves, and ensure that the cable cross-sectional area is within the range of
0.5–10mm
2
.
5.4 Additional Grounding Connection
Since the inverter is a transformerless inverter, neither the negative pole nor the
positive pole of the PV string can be grounded. Otherwise, the inverter will not
operate normally.
It is recommended that connect the additional grounding terminal and the PE
terminal of the AC cable to the protective grounding point before AC cable
connection, PV cable connection, and communication cable connection.
5.4.1 Additional Grounding Requirements
All non-current carrying metal parts and device enclosures in the PV power system
should be grounded, for example, brackets of PV modules and inverter enclosure.
When there is only one inverter in the PV system, connect the additional grounding
cable to a nearby grounding point.
When there are multiple inverters in the PV system, connect grounding points of all
inverters and the PV array frames to the equipotential cable (according to the onsite
conditions) to implement an equipotential connection.
5.4.2 Connection Procedure
Step 1 Prepare the cable and OT/DT terminal.
User Manual 5 Electrical Connection