Fronius Primo (Online) - Manual (Page 13)

11
EN
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.
Grid connection
of inverter or
dummy device
IMPORTANT! The PE ground conductor of the AC cable must be laid in such a way that it
is the last to be disconnected in the event that the strain-relief device should fail.
This can be ensured, for example, by making it somewhat longer and by laying it in a loop.
NOTE! Take into account local specifications when configuring cable cross sec-
tions.
1
2
3
NOTE! To ensure a proper ground connection, all three PE grounding terminals
must be tightened to the specified torque when the inverter is installed.
NOTE! Form loops with the AC cables when connecting them to the AC termi-
nals!
When securing the AC cables using a metric screw joint, ensure that the loops do
not protrude beyond the connection area. Under certain circumstances it may oth-
erwise no longer be possible to close the inverter.
NOTE!
-
Ensure that the grid neutral conductor is grounded. In the case of IT networks
(insulated networks with no grounding) this may not be the case; it will then
not be possible to use the inverter.
- In order to use the inverter, the neutral conductor must be connected.
A neutral conductor that is too small may adversely affect the grid power
feed operation of the inverter. The neutral conductor must therefore be the
same size as the other live conductors.