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3 Function Description
3.1 Safety Function
3.1.1 Protection
The protective functions are integrated in the inverter, including short circuit
protection, grounding insulation resistance surveillance, residual current
protection, anti-islanding protection, DC overvoltage / over-current protection,
etc.
3.1.2 Earth Fault Alarm
The inverter has integrated an earth fault dry-contact (DO2 relay) for the local
alarm. The external alarm needs to be powered by the grid.
The additional equipment required is a light indicator and/or a buzzer. The
recommended cross-section of the DO cable is 1 mm
2
.
If an earth fault occurs,
the DO2 dry-contact will switch on automatically to signal the external alarm;
the buzzer inside the inverter will also beep; and
the Ethernet communication port can be used for the remote alarm.
3.1.3 SPI and Auto Test (Italy only)
The auto test system will check the maximum/minimum frequency and voltage
provided in the interface protection system (SPI). For each frequency and
voltage protection function, the tripping threshold varies linearly upward or
downward with a slope of ≤ 0.05 Hz/s or ≤ 0.05 V/s respectively for the
frequency and voltage protection. For details, see “10.8 Auto Test (Italy)”.
The integrated SPI is capable to receive the signals aimed at changing the
frequency protection thresholds or the command of remote shutdown. For
details, see “11.2.6 Interface Protection System (SPI)”.
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