35
g
Grid Neutral Con-
ductor
Connecting Alu-
minum Cables
Cross Section of
AC Wires
For M32 metric screw joint:
Cable diameter 11 - 21 mm
For M40 metric screw joint:
Cable diameter 19 - 28 mm
If required, use reducers for smaller cable diameters.
Safety
Connecting the
Fronius IG Plus to
the public grid
(AC)
Only an authorized electrician is permitted to connect this inverter to the public grid.
NOTE! Make sure that the grid neutral conductor is grounded.
NOTE! The AC side terminals are not designed for connecting aluminum cables.
WARNING! An electric shock can be fatal. Danger due to grid voltage and DC
voltage from solar modules.
- The connection area should only be opened by a licensed electrician.
- The separate power stage set area should only be disconnected from the
connection area after first being disconnected from the grid power.
- The separate power stage set area should only be opened by Fronius-trained
service personnel.
Never work with live wires! Prior to all connection work, make sure that the AC
and DC wires are not charged.
CAUTION! Danger of damaging the inverter by overloading the grid neutral con-
ductor.
- Do not connect 2-phase and 3-phase devices together to one phase
- Never operate multi-phase devices in one phase
CAUTION! Danger of damaging the inverter from improperly connected termi-
nals. Improperly connected terminals can cause thermal damage to the inverter
and may cause a fire. When connecting the AC and DC cables, make sure that
all terminals are tightened securely using the proper torque.
NOTE! Finely stranded cables up to conductor class 5 can be connected to the
AC-side terminals without wire end ferrules.
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