PV Powered PVP4800 Informations techniques télécharger pdf (Page 18)

Grid-Tied Residential Inverters

Installation and Operation Manual

Line

Filter

Control pcb

Power Distribution PCB

Power

Supply

GND

PV GND

20 A SB

System Block Diagram

120/240 VAC

60Hz

DC input

PVP3500 & PVP2500

GND

GF Detect Circuit

Figure 3-6 System Block Diagram Showing Single-Point Ground

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 con-•

nected 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 1A

fuse.

If current is greater than 1A 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 shown in Figure 3-7.

Fault 0400 0000

Ground Fault

Figure 3-7 Ground Fault Message

Figure 3-6 is a schematic representation of the PV Powered single-point grounding. The

front cover is grounded through the cover mounting screws.

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PV Powered PVP4800 Informations techniques Page 18