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Connecting the Fronius IG TL to the public grid (AC)
Monitoring the
Grid
AC terminals
Legend:
L Phase conductor
N Neutral conductor
PE Grounding conductor / Ground
PE (a) Connection option for additional
ground
Max. cable cross section per conductor ca-
ble:
16 mm²
Min. cable cross section per conductor ca-
ble:
corresponds to the AC-side overcurrent-
protected value, but at least 2.5 mm²
Connecting alu-
minum cables
The AC-side terminals are designed for connecting single-wire, round, aluminum cables.
The following points must be taken into account when connecting aluminum cables due to
the non-conducting oxide layer of aluminum:
- Reduced rated currents for aluminum cables
- The connection requirements listed below
Connection Requirements:
Carefully clean off the oxide layer of the stripped end of the cable, e.g., using a knife.
IMPORTANTDo not use brushes, files or sandpaper. Aluminum particles may get stuck
and can transfer to other cables.
After removing the oxide layer of the cable end, rub in a neutral grease, e.g., acid- and
alkali-free Vaseline.
Then immediately connect it to the terminal.
Repeat the steps above whenever the cable is disconnected and then reconnected.
IMPORTANT! The resistance in the leads to the AC-side connection terminals must be as
low as possible for optimal functioning of grid monitoring.
AC
PE N LPE
PE(a)
NOTE! Connect the phase (L), neutral conductor (N), and grounding conductor
(PE) cables correctly!
NOTE! Take into account local specifications when configuring cable cross sec-
tions.
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