SAJ Suntrio-TL Series User Manual - page 23
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5)Screw the cap nut of the cable tightly.
5.5.3 Connecting the Second Protective Conductor
If required by the installation, the earth terminal can be used to connect a second protective
conductor or as equipotential bonding.
Procedure
Take out parts from the packing and insert the earthing wire to “PE” terminal located at the right
of the inverter, then tighten the screw.