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10.9.3 Frequency Anomaly Protection
When the grid frequency exceeds the permissible range, the inverter will stop feeding the
grid, send warning signal, and display the fault type on the LCD screen.
The inverter can detect the abnormal frequency and respond quickly.
10.9.4 Islanding Protection
Islanding is a case that can occur if the utility grid is disconnected while the inverter is
operating and the local load of the inverter is similar to the present output power.
“Islanding” is a potential threaten to devices and operators.
• In the event of grid outage, if the inverter still feeds power to the public grid, death or
injury may occur to the maintainers during maintenance.
• In the event of grid fault, if the inverter still feeds power to the public grid, a surge current
may occur and damage devices once the grid resumes.
The inverter is equipped with anti-islanding protection function.
In anti-islanding protection state, high voltage is still present. Disconnect the main
switch and wait the device to discharge completely before testing or maintenance.
10.9.5 Overload Protection
When the PV array output power exceeds the inverter permissible maximum input power,
the inverter will limit the power yield at maximum AC power point. If the temperature
exceeds the permissible value, the inverter will automatically stop operating unless the
temperature recovers to normal levels.
10.9.6 Ground Protection
The grounding cables are equipped with the leakage current sensor. When it is detected
that the leakage current exceeds the setting value, the system will send an instruction to
stop the inverter and display the fault type on the LCD screen.
10.9.7 Module Over-temperature Protection
IGBT modules inside the inverter use a high-precision thermal sensor to monitor the real-
time module temperature. Once high module temperature is detected, DSP will send
instruction to stop the inverter.
10.9.8 Internal Over-temperature Protection
The inverter is equipped with high-precision thermal sensor to monitor the internal
temperature of the inverter. Once the over-temperature is detected, the DSP will send an
instruction to stop the inverter and keep safe operation.
System Manual 10 Main Functions
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