Arc Detector / Interrupter; Warning Notices Affixed To The Device - Fronius Symo 10.0-3 208-240 Instructions De Service

Isolation Monitor / Interrupter (IMI)
The inverter controls the insulation resistance before connecting to the grid. If the insula-
tion resistance drops below a certain level, no connection to the grid is established.
While energy is fed into the grid, the automatic leakage current monitoring is carried out. If
a defined leakage current value is exceeded, the inverter is disconnected from the grid.
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- The inverter has an integrated arc detector / interrupter, which detects and deletes serial
terrupter arcs.
A serial arc may occur after the following example errors or situations:
-
-
-
-
-
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 There are warning notices and safety symbols on and in the inverter. These warning notic-
Affixed to the De- es and safety symbols must not be removed or painted over. They warn against incorrect
vice operation, as this may result in serious injury and damage.
12
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.
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:
Risk of serious injury and damage due to
incorrect operation
Do not use the functions described here
until you have fully read and understood
the following documents:
- These operating instructions
- all the operating instructions for the
system components of the photovol-
taic system, especially the safety
rules
Dangerous electrical voltage
Wait for the capacitors to discharge.