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3�3 Safety installations
Surge protection
The inverter is tted with surge arresters (varistors) at its input and output. Each MPP
tracker (plus and minus connections) is equipped with a surge arrester. On the AC side,
each mains phase has a surge arrester (for details on the surge arresters tted, see
Section 11).
When designing the PV system, it may be necessary to provide additional external light-
ning protection.
Fault current monitoring
The inverter has an AC/DC sensitive leakage current sensor which monitors the stray
currents occurring on the generator side. This sensor can distinguish between the oper-
ational capacitive stray currents (caused by capacities of the PV modules to ground) and
leakage currents (caused by touching a pole of the PV generator). If the inverter detects
an excess in the permissible leakage or stray currents, it will disconnect from the grid.
Functions for current and output limitation
When it is needed, the inverter limits the DC feed-in current, the output power and the
output current.
Temperature limitation
At ambient temperatures of more than 45°C the equipment temperature may reach more
than 80°C. In such cases, the maximum in-feed power is temporarily reduced. When the
equipment temperature rises above 85°C, the inverter disconnects from the grid.
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