FIMER_PVS-175-TL A.1 Version_Product manual_EN_RevC-
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Safety 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 to ensure the protection of the people working on the
grid, in accordance with the relevant national laws and regulations. To prevent possible islanding, the inverter is
equipped with an automatic safety disconnection system called “Anti-Islanding”.
The method used to ensure an active anti-islanding protection is: active frequency drift in combination with RoCoF
techniques.
NOTE – D Anti-islanding protection mechanisms are different depending on the grid standards, even if
they all have the same purpose.
Ground fault of the photovoltaic panels
ATTENTION – A Use this inverter with panels connected in “floating” mode, i.e. with no earth connections
on the positive and negative terminals.
An advanced ground fault protection circuit continuously monitors the ground connection and disconnects the
inverter when a ground fault indicating the fault condition by means of the red “GFI” LED on the LED panel (08)
on the front side of wiring box.
Overvoltage surge arresters
As an additional protection to prevent damage caused by the discharges from lightning and electrostatic induction
phenomena, this inverter is equipped with DC over-voltage surge arresters (24) and with AC over-voltage surge
arresters (25).
Other safeguards
This inverter is equipped with additional protective devices to ensure safe operation in any circumstance. These
protections include:
•
Constant monitoring of the grid voltage to ensure that voltage and frequency values remain within operating
limits;
•
Internal temperature control to automatically limit the power (if necessary) to prevent overheating of the unit
(derating).
NOTE – D The numerous control systems determine a redundant structure to ensure absolutely safe
operations.
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