Additional Grounding Connection; Additional Grounding Requirements - Sungrow SG30CX User Manual

User Manual
1. Copper to Aluminium adapter
terminal
Ensure that the selected terminal can directly contact with the copper bar. If
there are any problems, contact the terminal manufacturer.
Direct contact between the copper bar and the aluminium cable will cause
electrochemical corrosion and impair the reliability of electrical connection.

5.5 Additional Grounding Connection

Since the inverter is transformerless, neither the negative pole nor the posi-
•
tive pole of the PV string can be grounded. Otherwise, the inverter will not op-
erate 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 dam-
age caused by the violation.

5.5.1 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 in-
verters and the PV array frames to the equipotential cable (according to the onsite con-
ditions) to implement an equipotential connection.
f f i i g g u u r r e e 5 5 - - 2 2 Aluminium cable terminal connection sequence
2. Flange nut 3. Aluminium cable
5 Electrical Connection
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