21 22
6.4.2 Connecting the Bidirectional DC/DC Box
Connecting the BAT input terminals
Danger to life due to lethal voltages!
Before connecting the Bidirectional DC/DC Box, ensure that the Box
is disconnected from any power supply. NEVER connect or
disconnect the BAT connectors under load.
Ensure the correct polarity when connecting the Bidirectional DC/DC
Box to the inverter.
Improper operation during the wiring process can cause fatal injury
to the operator or unrecoverable damage to the inverter. Only
qualified personnel can perform the wiring work.
WARNING
DANGER
4~6mm²
4~6mm²
Cable
Cable
Positive metal
contact
Positive connector
Negative metal
contact
Negative connector
Fig 6.8
1.Strip the cable by 10mm and pass it through the waterproof gland and the threaded
sleeve, then tighten the screws.
Fig 6.10
Fig 6.11
Fig 6.12
2.Connect the client-side to the port on the inverter and ensure that they are securely
connected.
Removing the signal connector
1.Press down the fastener and pull it out from the inverter.
6.5 Connecting the signal cable
The MID series inverter is equipped with a 30-Pin signal connector, except for Vietnam
models. Please refer to Section 10.1 for details. The port connected to the client-side
signal cable is shown below:
Fig 6.9
Fig 6.13
6.6 Grounding the inverter
The inverter must be connected to the AC grounding conductor of the power distribution
grid through the ground terminal (PE) .
WARNING
Because of the transformerless design, the DC positive pole and DC
negative pole of PV arrays are not permitted to be grounded.
This inverter complies with IEC 62109-2 Clause 13.9 for earth fault alarm
monitoring.
If an Earth Fault Alarm occurs, the fault code “Error 303, NE abnormal”
will be displayed on the inverter screen while the LED indicator will turn
red. (Applicable to inverters with graphical display only)
The Inverer Side
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