Protective devices
Anti-Islanding
In the event of a local grid outage by the electricity company, or when the
equipment is switched off for maintenance operations, the inverter must
be physically disconnected safely, to ensure protection of people work-
ing on the grid, all in accordance with the relevant national standards
and laws. To prevent possible islanding, the inverter is equipped with an
automatic protective disconnection system called “Anti-Islanding”.
Anti-islanding protection mechanisms are different depending on the grid standards, even if
they all have the same purpose.
Ground fault in the photovoltaic panels
This inverter must be used with panels connected with “oating” connec-
tions, that is, with positive and negative terminals without ground connec-
tions. An advanced ground fault protection circuit continuously monitors
the ground connection and disconnects the inverter when a ground fault
is detected. The ground fault condition is indicated by a red “GFI” LED
on the front panel.
String fuses
In the S2F / S2X versions, string fuses
22
that protect the equipment
from currents above the limit value, independently for each string, are
pre-installed inside the wiring box
02
.
The sizing of the fuses must be carefully considered during installation.
Overvoltage surge arresters
As additional protection to prevent damage caused by lightning dischar-
ges and electrostatic induction phenomena, DC overvoltage surge arre-
sters
15
and AC overvoltage surge arresters
18
are integrated inside the
wiring box
02
(S2X versions).
Further protective devices
The inverter is equipped with additional protective devices to guarantee
safe operation in any circumstance. These protective devices include:
- Continuous monitoring of the grid voltage to ensure the voltage and
frequency values stay within operating limits;
- Control of internal temperatures to automatically limit the power if nec-
essary to ensure the unit does not overheat (derating).
The numerous control devices produce a replete structure to guarantee totally safe operation.
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