Connecting The Inverter To The Public Grid (Ac); Safety; Monitoring The Grid; Type Of Ac Cable - Fronius Symo 3 Installation Instructions Manual

Connecting the inverter to the public grid (AC)

Safety

Monitoring the
IMPORTANT! The resistance in the leads to the AC-side connection terminals must be as
Grid
low as possible for optimal functioning of grid monitoring.

Type of AC cable

The following types of AC cable can be connected to the AC terminals of the inverter:
Cu / Al
Connecting alu- The AC-side terminals are designed for connecting single-wire, round, aluminum cables.
minum cables The following points must be taken into account when connecting aluminum cables due to
the non-conducting oxide layer of aluminum:
-
-
Connection Requirements:
1
IMPORTANTDo not use brushes, files or sandpaper. Aluminum particles may get stuck
and can transfer to other cables.
2
3
Repeat the steps above whenever the cable is disconnected and then reconnected.
WARNING! Incorrect operation or poorly executed work can cause serious injury
or damage. Commissioning of the inverter may only be carried out by trained per-
sonnel in accordance with the technical regulations. Read the installation and op-
erating instructions before installing and commissioning the equipment.
WARNING! An electric shock can be fatal. Danger due to grid voltage and DC
voltage from solar modules that are exposed to light.
- Ensure that both the AC side and the DC side of the inverter are de-ener-
gised before carrying out any connection work.
- Only an authorised electrical engineer is permitted to connect this equipment
to the public grid.
CAUTION! Risk of damage to the inverter as a result of incorrectly tightened ter-
minals. Incorrectly tightened terminals can cause heat damage to the inverter
and, in turn, lead to a fire. When connecting AC and DC cables, ensure that all
the terminals are tightened to the specified torque.
Cu
- copper or aluminium: round, single wire
- Copper: round, finely stranded up to conductor category 4
Reduced rated currents for aluminum cables
The connection requirements listed below
NOTE! Take into account local specifications when configuring cable cross sec-
tions.
Carefully clean off the oxide layer of the stripped end of the cable, e.g., using a knife.
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.
13