20
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.
IMPORTANT! Do 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-free
and alkali-free Vaseline.
Then immediately connect it to the terminal.
Repeat the steps above whenever the cable is disconnected and then reconnected.
Monitoring the
Grid
Fronius Symo
15.0-3 208 – fer-
rite ring
1
Fronius Symo 15.0-3 208
With Fronius Symo 15.0-3 208, the three
phases and neutral conductor must be fed
through a ferrite ring. The ferrite ring is in-
cluded in the scope of delivery for the inver-
ter.
The ground conductor (PE) must not be fed
through the ferrite ring.
Connecting the
inverter to the
public grid (AC)
IMPORTANT! The ground conductor GND of the AC cable must be laid so that it is discon-
nected last.
Measure the ground conductor GND longer, for example, and loop.
NOTE! Take into account local specifications when configuring cable cross sec-
tions.
1
2
3
IMPORTANT! The resistance in the leads to the AC-side connection terminals must be as
low as possible for optimal functioning of grid monitoring.
Fronius Symo
15.0-3 208
1
NOTE! To ensure a proper ground connection, all grounding terminals GND must
be tightened with the specified torque during installation.
NOTE! Form loops of at least 4 in. (102 mm) in the AC cables when connecting
them to the AC terminals.
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