Resistance Measurement - SMA ESHV-P-NR Instructions D'installation

SMA Solar Technology AG

Resistance Measurement:

– Check if the line circuit breaker is switched off and that all DC plug connectors have been
disconnected from the inverter.
– Insert the Electronic Solar Switch in its socket on the inverter.
Otherwise the measurement cannot be made.
– Measure the resistance between DC and the AC cables PE connector.
The position of the measuring points is illustrated in the overview diagrams in section
„Sunny Boy / Sunny Mini Central" (93).
– Positive grounding set:
The resistance between DC + and the AC cables PE connector must not exceed
0.5 Ohms.
– Negative grounding set:
The resistance between DC - and the AC cables PE connector must not exceed
0.5 Ohms.
14. Disconnect the Electronic Solar Switch and close the inverter as described in its installation
guide.
15. Choose one of the four warning labels provided, with the appropriate language, and attach it
to the inverter.
16. Connect the conductive part of the under-construction of the PV generator with the grounding
system.
Certain module manufacturers demand the grounding of a generator pole in order to avoid
potential differences between the ground potential of the grounding set and the surrounding of
the PV generator. By grounding the under-construction of the PV generator these potential
differences will be avoided. Additionally this potential equalization provides the best possible
protection via the fuse integrated in the grounding set.
Display of a Ground Fault
If the grounding set is installed, and the inverters red LED shines, an undesired grounding
fault is present in the PV generator. Remove the cause of the grounding fault, and replace
the grounding set.
Installation Guide
Installation
ESHV-IXX103013 19