Additional Grounding Connection; Additional Grounding Requirements; Connection Procedure - Sungrow SG2.0RS-S User Manual

5 Electrical Connection
N N o o . . C C a a b b l l e e
AC cable
4
Additional
5 Grounding
cable
(1) The cable requirements for C C O O M M 2 2 terminal connection are the same.
(2) All the AC wires should be equipped with correctly colored cables for distinguishing.
Please refer to related standards about the wiring color.

5.4 Additional Grounding Connection

• Since the inverter is transformerless, neither the negative pole nor the
positive pole of the PV string must be grounded. Otherwise, the inverter will
not operate normally.
• Connect the additional grounding terminal to the protective grounding point
before AC cable connection, PV cable connection, and communication cable
connection.
• The ground connection of this additional grounding terminal cannot replace
the connection of the PE terminal of the AC cable. Make sure those terminals
are both grounded reliably. SUNGROW shall not be held liable for any
damage caused by the violation.

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, mounts of PV modules and the 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

Additional grounding cable and OT/DT terminal are prepared by customers.
Step 1 Prepare the cable and OT/DT terminal.
22
T T y y p p e e
Outdoor 3-core
(2)
copper wire cable
Outdoor single-core
copper wire cable
W W i i r r e e C C o o n n d d u u c c t t o o r r
C C a a b b l l e e D D i i a a m m e e t t e e r r
C C r r o o s s s s - - s s e e c c t t i i o o n n
12 mm–25 mm 4 mm
The same as that of the PE wire in the
AC cable
User Manual
–6 mm
2 2