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Insulation monitoring
In photovoltaic systems with ungrounded solar modules, the inverter checks the resistance
between the photovoltaic system's positive or negative pole and the ground potential. In
the case of a short circuit between the DC+ or DC- cable and the ground (e.g., due to poorly
insulated DC cables or faulty solar modules) the inverter disconnects from the grid.
Arc Detector / In-
terrupter
The inverter has an integrated arc detector / interrupter, which detects and deletes serial
arcs.
A serial arc may occur after the following example errors or situations:
-
poorly connected DC plug
-
defective solar module connection sockets
-
high resistance solder connections between the cells of a solar module
-
incorrect cable connected to the input terminal of an inverter
-
defective DC cables that allow a connection to the ground.
If an arc is detected, the power is shut down and the grid power feed operation is interrupt-
ed. A status code appears on the display.
The status code on the display must be reset manually before the grid power feed opera-
tion can be resumed.
The power shut down also deletes the serial arc.
Warning Notices
Affixed to the De-
vice
The inverter contains and displays warning notices and safety symbols. These warning no-
tices and safety symbols must NOT be removed or painted over. The notices and symbols
warn against operating the equipment incorrectly, as this may result in serious injury and
damage.
Text of Warning Notices:
NOTE!
Power optimizers for solar modules or data transfer via DC cables (PLC
– Power Line Communication) in the PV system can compromise the correct
function of the arc detector / interrupter.
When using such components, it is the responsibility of the system installer to en-
sure that the arc detector / interrupter functions correctly. Contact Fronius Tech-
nical Support for further information.
Safety Symbols:
Danger of serious injury or dam-
age due to incorrect operation
Do not use the functions de-
scribed until you have thoroughly
read and understood the following
documents:
-
these operating instructions
-
all operating instructions for
system components of the
photovoltaic system, espe-
cially the safety rules
Dangerous electrical voltages
You must wait until the capacitors
have discharged
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