SMA SC 400HE - Manual (Page 24)

3 Product Description SMA Solar Technology AG
24 SC4-63HE-BE-BEN103280 Operating Manual
Figure 9: Remote GFDI in the Sunny Central
If the remote GFDI is tripped, a motor will close it after a starting command. The starting command
can also be given via a remote tripping. This allows the inverter to switch back to feed-in operation
after the delay.
The Sunny Central's default setting allows up to 3 attempts to start the remote GFDI per day.
If the remote GFDI is tripped three times in one day, the software assumes that there is a "permanent
insulation fault" and the inverter no longer goes into operation. In this case, the insulation should be
checked by an electrically skilled person and repaired if necessary. The fault should then be
confirmed.
3.8.4 Soft Grounding
Depending on the order, the insulation in the Sunny Central is monitored via soft grounding.
This process grounds one pole of the PV array through a resistor.
Figure 10: Soft grounding in the Sunny Central
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