Huawei Backup Box-B0 Quick Manual page 10

• When installing a short-circuiting plate, ensure that it is inserted into the correct port and
securely installed to avoid short circuits caused by incorrect installation.
• If no short-circuiting plate is installed, the neutral wire will be suspended in off-grid mode,
but the off-grid/grid-tied switching function is not affected. You are advised to install a
short-circuiting plate according to the local power grid standard.
Neutral Wire Connected
If the neutral wire cannot be disconnected from the power grid in off-grid mode (such as in
Australia), insert the short-circuiting plate between 4 and 5 of the AC terminal X2 according to
the local power grid standard.
Power grid AC terminal X2
(Single-Phase/Three-Phase)
Neutral Wire Disconnected
If the neutral wire needs to be disconnected in off-grid mode (such as in German), according to
the local power grid standard, insert the short-circuiting plate between 10 and 11 of the AC
terminal X3 for the single-phase Backup Box. Insert the short-circuiting plate between 12 and
13 of the AC terminal X3 for the three-phase Backup Box.
Inverter AC terminal X3 (single-phase)
3.7 Installing Signal Cables
Communications Terminal Definition
No. Label Definition
DI Digital input signal+
1
GND GND of the DI port
2
Note
Connects to the positive pole of the DI port and functions as
the port for the Backup Box to send feedback signals.
Connects to the GND of the DI port.
9
Inverter AC terminal X3 (three-phase)