SMA Solar Technology AG
3 Product Description
User Manual
SCCP-JP-BA-A4-en-12
23
3.7.2.2 Remote GFDI
Depending on the order option, ground-fault monitoring in the Sunny Central can 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 K-type circuit breaker with adjustable operating current. The Remote GFDI is integrated
in the Sunny Central and connected between an input busbar and the grounding busbar.
Figure 7: Remote GFDI in the Sunny Central
If the Remote GFDI triggers, initially a temporary error will be assumed and a motor drive will close the Remote GFDI
after a defined delay. No external switch command is required to close the triggered Remote GFDI. The Sunny Central
will switch back to feed-in operation after a defined delay.
In the default setting of the Sunny Central, the software will attempt to start the Remote GFDI up to three times per day.
If the Remote GFDI triggers on several consecutive days, the software will assume that a permanent insulation error has
occurred, and the Sunny Central will no longer revert to operation. In this case, a qualified person will need to check and,
if necessary, repair the insulation and then acknowledge the error.
