Isolation Monitor / Interrupter, Insulation Monitoring; Arc Detector / Interrupter - Fronius Symo 10.0-3 208-240 Instruction Manual

Proper use also means
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When configuring the photovoltaic system, make sure that all photovoltaic system compo-
nents are operating completely within their permitted operating range.
All measures recommended by the solar module manufacturer for maintaining solar mod-
ule properties must be followed.
Utility company regulations regarding grid power feed must be followed.
Isolation Monitor / The inverter is fitted with the following safety functions as required by UL 1741 and the Na-
Interrupter, Insu- tional Electrical Code:
lation Monitoring
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:
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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.
carefully reading and obeying all the instructions and safety and danger notices in the
operating instructions
carrying out all the specified inspection and servicing work
installation as per operating instructions.
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.
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