Ground Fault Detector / Interrupter, Insulation Monitoring; Arc Detector / Interrupter - Fronius Galvo 208-240 1.5-1 Operating Instructions Manual

Ground Fault De- The inverter is fitted with the following safety functions as required by UL 1741 and the Na-
tector / Interrupt- tional Electrical Code:
er, Insulation
Monitoring Ground fault detector / interrupter (GFDI)
In photovoltaic systems with negatively grounded solar modules, the negative cable from
the solar module is connected to the grounding system in the inverter. If a ground fault oc-
curs in the DC wiring, the inverter disconnects from the grid.
Insulation monitoring
In photovoltaic systems with ungrounded solar modules, the inverter checks the resis-
tance between the photovoltaic system's positive or negative pole and the ground poten-
tial. 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.
10
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.