EVVO 20000TLG23P~EVVO 33000TLG23P
EVVO 20000TLG23P~EVVO 33000TLG23P
25
26
4.1 Electrical connection
Figure4-1 Shows the flowchart for connecting cables to the inverter
4.2 Connecting PGND Cables
Connect inverter to the grounding electrode using protection ground (PGND) cables for
grounding purposes.
The inverter is transformer less, it does not require The positive pole and the
negative pole of the PV array are not grounded, Otherwise it will cause inverter
failure, In the PV power generation system, all non-current carrying metal
parts(such as: Bracket, Junction box shell, inverter shell) should be connected to
earth.
Attention
Note:
Good grounding for the inverter can help resist the impact of the surge voltage and improve the EMI
performance. First connect the PGND cable before connecting the AC power cable, DC power cable, and
communication cable.
For the system with one the inverter, connect the PGND cable to the ground. For the system with multiple the
inverter, connect the PGND cables of all the inverter to the grounding electrode using equipotential bonding.
If the installation location is near the ground, first connect the PGND cable to the ground before installing the
inverter on the wall.
Figure4-2 Ground terminal composition
Prerequisites:
The PGND cables are prepared (8 AWG outdoor power cables are recommended for
grounding purposes).
Procedure:
Step 1
Remove the insulation layer with an appropriate length using a wire stripper, as shown
in Figure 4-3.
Figure4-3 Preparing a ground cable (1)
Note
：
L2 is 2 to 3mm longer than L1
Step 2
Insert the exposed core wires into the OT terminal and crimp them by using a crimping
tool, as shown in Figure 4-4. OT terminal is recommended The PE cable is better larger
than 6Sq.mm.
Note 1:
L3 is the length between the insulation layer of the ground cable and the crimped part. L4 is the distance between
the crimped part and core wires protruding from the crimped part.
Note 2:
The cavity formed after crimping the conductor crimp strip shall wrap the core wires completely. The core wires shall
contact the terminal closely.
Step 3
Install the crimped OT terminal, flat washer, and spring washer on the M5 welded
stud, and tighten the nut to a torque of 5 Nm. using a socket wrench.
Note:
To enhance the anti-corrosion performance of the ground terminals, apply silica gel on them after connecting the
ground cable.
1.
OT Terminal
2.
M6 Ground Connection terminal
L2=L1+(2-3) mm
L1
Connect Communication
Cables
Connect DC Input power
Cables
End
Start
Connect PGND Cables
Connect AC Output power
Cables
Figure4-4 Preparing a ground cable (2)
L3<2mm
L4<1.5mm
2
