Connecting Solar Module Strings; Solar Module Ground; Wire Cross Section Of Solar Module Strings - Fronius IG Plus 3.0-1 Operating Instructions Manual

Connecting Solar Module Strings

Solar Module The Fronius IG Plus is designed for a solar module ground at the negative
Ground pole. The solar module ground is carried out via a fuse in the inverter.
Solar module ground at negative pole with fuse
Wire Cross
Section of
Solar Module
Strings
Solar module
DC+
String fuse
DC-
WARNING! An electric shock can be fatal. Normally grounded
conductors may be ungrounded and energized when a ground
fault is indicated. The ground fault has to be repaired before
operation is resumed.
NOTE Do not connect the ground to the DC negative at any
point! This is already done within the Fronius IG Plus. If the DC
negative is connected to ground at the DC terminal block or prior,
this will circumvent the GFDI protection system, preventing your
Fronius IG Plus from properly detecting a fault current. Additional-
ly, turning the DC disconnect to the off/open-circuit condition will
not disconnect the array from ground, as it only disconnects the
DC positive.
WARNING! An electric shock can be fatal. Inadequately sized
electrical components can cause serious injuries to persons
and damage to (or loss of) property.
- All electrical installations must be in accordance with the
National Electrical Code, ANSI/NFPA 70, and any other
codes and regulations applicable to the installation site.
- For installations in Canada the installations must be done in
accordance with applicable Canadian standards.
- Use copper wire for all grounding wires
- For appropriate grounding see NEC Section 250.
38
Inverter
DC main switch
= =
~ ~
GFDI fuse
N
L1
L2
L3
GND