Wiring the Sunny Boy
SMA America, LLC
54
SB20_25_30HFUS-eng-IUS113711
Installation Guide
6.6 Installation of the SMA Plug-in Grounding
SMA Plug-in Grounding enables for array grounding and contains a fuse for Ground Fault Indication
(GFDI). If a ground fault occurs, the fuse in the SMA Plug-in Grounding disconnects the fault current
generated.
The type of grounding (positive/negative) is coded into the grounding stick.
The SMA Plug-in Grounding must be installed according to the desired array grounding before
commissioning the Sunny Boy.
Installing the SMA Plug-in Grounding
1. Disconnect the Sunny Boy from voltage sources (see section 8.1 ”Disconnect the Sunny Boy
from Voltage Sources” (page 65)).
2. Open the SMA DC Disconnect (see section 8.2 ”Open SMA DC Disconnect” (page 66)).
3. Check whether the SMA Plug-in Grounding is
screwed together: hold the connection part of the
SMA Plug-in Grounding firmly and screw on the
cap of the SMA Plug-in Grounding by hand.
DANGER
Danger of electric shock caused by damaged SMA Plug-in Grounding.
If the SMA Plug-in Grounding is damaged water can enter into it. Contact with high voltage
possible.
• Check Plug-in Grounding before installation.
• Do not install a damaged Plug-in Grounding.
• If the Plug-in Grounding fell down and no damage is visible but you doubt its proper
functionality, replace it with a new one.
Changing operating parameter for grounding of the Sunny Boy
The operating parameter of the Sunny Boy is preset to negative grounding.
When the grounding of the Sunny Boy must be changed to positive grounding you must
change the operating parameter ”Cntry.Mdul.GndModReq” of the Sunny Boy via a
communication product.
