![Fronius Symo 3.7-3-S Operating Instructions Manual Download Page 14](http://html1.mh-extra.com/html/fronius/symo-3-7-3-s/symo-3-7-3-s_operating-instructions-manual_2339228014.webp)
12
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- and
alkali-free Vaseline.
Then immediately connect it to the terminal.
Repeat the steps above whenever the cable is disconnected and then reconnected.
Inverter DC con-
nection
IMPORTANT!
Check the polarity and voltage of the solar module strings: the voltage must
not exceed the following values:
-
when installed between 0 and 2000 m above sea level: 1000 V
-
when installed between 2000 and 2500 m above sea level: 900 V
-
when installed between 2500 and 3000 m above sea level: 815 V
-
when installed between 3000 and 3400 m above sea level: 750 V
The difference between the individual solar module strings must not exceed 10 V.
If DC cables are laid over the shaft of the
DC main switch or across the connection
block of the DC main switch, they may be
damaged when the inverter is swung in, or
they may even prevent the inverter from
being swung in.
IMPORTANT!
Do not lay DC cables over
the shaft of the DC main switch or across
the connection block of the DC main switch!
1
2
3
NOTE!
Only break out as many target break points as the number of cables that
are provided (e.g. if there are 2 DC cables, then break out 2 recesses).
DC+
DC-