10 Function Description
SMA Solar Technology AG
User Manual 89SCCPXT-E7-BA-en-58
Figure 19: GFDI
Position Designation
A GFDI
10.2.3.3 Remote GFDI
Depending on the order option, ground fault monitoring in the inverter may be carried out via ground fault detection
and interruption with motor drive, in short "Remote GFDI". This grounds one terminal of the PV array. Remote GFDI also
enables automatic error processing. This reduces downtimes and avoids service calls due to temporary insulation
errors such as when condensation occurs on the PV modules. Remote GFDI is performed via a high-performance K-type
circuit breaker with adjustable operating current. The remote GFDI is integrated in the inverter and connected between
an input busbar and the grounding busbar.
Figure 20: Remote GFDI
Position Designation
A Remote GFDI
If the RemoteGFDI trips, initially a temporary error will be assumed and a motor drive will close the RemoteGFDI after
a defined waiting time. No external switch command is required to close the tripped RemoteGFDI. The inverter can
switch back to feed-in operation after a waiting time. In the default setting of the inverter, the software will attempt to
start the RemoteGFDI up to three times per day. If the RemoteGFDI is tripped on several consecutive days, the
software assumes a permanent insulation error and the inverter will no longer switch back on. In this case, a qualified
person will need to check and, if necessary, repair the insulation and then acknowledge the error.
To Next Page
Loading...
