Dc Terminals; Connecting Aluminum Cables; Cable Cross Section Of Solar Module Strings; Polarity Reversal Of Solar Module Strings - Fronius IG-TL 3.0 Operating Instructions Manual

DC terminals

DC+ and DC- terminals on the Fronius IG TL
Connecting alu- The DC-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
IMPORTANT Do 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.
Cable cross sec- The cable cross section for solar module strings should be a maximum of 16 mm² per ca-
tion of solar mod- ble.
ule strings The min. cable cross section should be 2.5 mm².
Polarity reversal The inverter comes standard with 6 metal bolts in fuse holders in the power stage set.
of solar module These metal bolts ensure that the inverter is protected against reversed polarity. Reverse
strings polarity in the solar module strings will not cause any damage to the inverter.
DC-
DC+
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.
NOTE! To ensure that the strain relief device is effective for solar module strings,
only use cable cross sections of the same size.
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