18
Notes on grid connection
Monitoring the
Grid
AC Connection
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.
Example: Fronius Primo 3.8–8.2
If AC cables are laid over the shaft of the
DC main switch or across the DC main
switch connection block, the cables may be
damaged when the inverter is pivoted or the
inverter may not be able to be pivoted.
IMPORTANT! Do not lay AC cables over
the shaft of the DC main switch or across
the DC main switch connection block!
Example: AC cables (Fronius Primo 3.8–8.2)
If excessively long AC or DC cables are laid
in loops in the connection area, fix the cab-
les to the designated eyelets at the top and
bottom of the connection block using cable
ties.
IMPORTANT! The resistance in the leads to the AC-side connection terminals must be as
low as possible for optimal functioning of grid monitoring.
NOTE! Fronius Primo 3.8–8.2 only:
To ensure a proper ground connection, all 3 grounding terminals GND must be
tightened with the specified torque during installation.
NOTE! Loop the AC cables when connecting them to the AC terminals:
Fronius Primo 3.8–8.2: min. 4 in. (102 mm)
Fronius Primo 10.0–15.0: in accordance with NEC
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