Specifications

V97-600002 Page 11 of 31
2.3.4 GFI Circuit
The purpose of the Ground Fault Interrupter (GFI) circuit is to detect a ground fault
(unintended current flow from the PV arrays to earth ground).
• For the GFI circuit to function as designed, the PV array safety ground must
be connected only at the ground terminals provided.
• Bonding the safety ground to the grounded leg of the array anywhere but
through the inverter will bypass the GFI circuit. This creates an unsafe
operating condition.
• The GFI works by using a fuse to connect or bond the PV array negative (or
the PV array positive if using a positively grounded array) to earth ground
through the 1 A fuse.
• If current is greater than 1 A between the grounded array terminal and the
earth ground, the fuse will “blow”. A “blown” or open fuse will disconnect the
PV arrays from their ground reference and interrupt the ground fault current.
In this situation, the inverter will cease operation and display a fault message
(as illustrated below):
Fault 0400 0000
Ground Fault
If the inverter displays “Ground Fault”, turn OFF the AC and DC to the
inverter and refer to the Troubleshooting section of this manual.
Figure 5: AC and PV Grounding
AC Ground
PV Ground