5.4 Installing AC Output Power Cables and Signal
Cables
Precautions
It is recommended that a three-phase AC switch be installed on the AC side of the
inverter. To ensure that the inverter can safely disconnect itself from the power
grid when an exception occurs, select a proper overcurrent protection device in
compliance with local power distribution regulations.
● Do not connect loads between an inverter and an AC switch that directly
connects to the inverter. Otherwise, the switch may trip by mistake.
● If an AC switch is used with specications beyond local standards, regulations,
or the Company's recommendations, the switch may fail to turn o in a timely
manner in case of exceptions, causing serious faults.
Each inverter shall be equipped with an AC output switch. Multiple inverters shall
not connect to the same AC switch.
The inverter is installed with an integrated residual current monitoring unit. When
the inverter detects that residual current exceeds the permitted value, it
disconnects from the power grid quickly.
● If the external AC switch provides the leakage protection function, the rated
residual operating current must be greater than or equal to 300 mA.
● If multiple inverters are connected to the master leakage protection device
through their external AC switches, the rated residual operating current of the
device must be greater than or equal to the number of inverters x 300 mA.
● The AC switch cannot be a knife switch.
SUN2000-(12KTL-25KTL)-M5 Series
User Manual 5 Electrical Connections
Issue 10 (2024-05-14) Copyright © Huawei Digital Power Technologies Co., Ltd. 42
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