User Manual
2 Product Introduction
13
Inverter provides various parameters configuration for optimal operation.
Communication interface
Standard RS485 interface for connecting other monitoring devices into the
PV system is included.
Protection functions
−
Short circuit protection
−
Insulation resistance to ground surveillance
−
Inverter output voltage surveillance
−
Inverter output frequency surveillance
−
Residual current protection
−
DC component of AC output current surveillance
−
Anti-islanding phenomena protection
−
Ambient temperature surveillance
−
DC over-voltage protection
−
Over current protection
−
Power module over-temperature protection
2.3.3 Derating
Derating the output power is a way to protect the inverter from overload and
potential faults. Inverter’s derating function can be activated in the following
scenarios:
Grid voltage too low
Temperature too high (Inner temperature and power modules temperature)
Power limit setting on the inverter LCD display or remote dispatch
Grid frequency too high (when the Country selection is “DE” or “IT”)
Power Limit Setting
User may allocate output power value of the inverter via LCD control panel or
the remote dispatch from the grid company. Under this kind of power derating,
the operating states will display on the LCD screen.
Over-temperature Derating
Power modules over-temperature may result from high ambient temperature,
poor ventilation or fault of fans. Over-temperature derating may protect the
inverter as well as the power modules against damage.
When the modules temperature exceeds an upper limit, the inverter start to
gradually derating until the temperature decreases to normal range.
When the inner temperature exceeds an upper limit, the inverter start to
gradually derating until the temperature decreases to normal range.
The deration lower limitation is about 33%.
If the modules temperature and the inner temperature are both
exceed the limit, the actual derating power value will be the less
one.
Grid Under-voltage Derating
Once the grid voltage is in the defined range of Vgrid(Vmin…266V), the inverter
will decrease the power output.
