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Several protective functions are integrated in the inverter, including short circuit protec-
tion, grounding insulation resistance monitoring, residual current protection, grid monitor-
ing, DC overvoltage/overcurrent protection, etc.
Earth Fault Alarm
The inverter is equipped with a DO relay for the local earth fault alarm. The additional equip-
ment required is a light indicator and/or a buzzer that needs additional power supply.
After the connection, if the earth fault occurs, the DO dry-contact will switch on automatically
to signal the external alarm.
DRM ("AU"/"NZ")
The DRM function is only applicable to a single inverter.
The inverter provides terminals for connecting to a Demand Response Enabling Device
(DRED). After the connection, the DRED asserts demand response modes (DRMs). The in-
verter detects and initiates a response to all supported demand response modes listed in
the following table.
table 2-2 Demand Response Mode Explanation
Mode Explanation
DRM0 The inverter is in the state of shutdown.
Ripple Control
The inverter provides terminals (DRM) for connecting to a Ripple Control Receiver (RCR).
After the connection, the grid dispatching center issues regulation instructions via dry con-
tact (DI). The inverter can control power output according to the local preset instructions.
PID Recovery
• For positive voltage scheme, after the PID function is enabled, the voltage to ground of
all PV strings is greater than 0, and therefore the PV string-to-ground voltage is a positive
value.
• For negative voltage scheme, after the PID function is enabled, the voltage to ground of
all PV strings is lower than 0, and therefore the PV string-to-ground voltage is a negative
value.
2 Product Description User Manual