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.
L2=L1+(2-3)mm
L1
Note
:
L2 is 2 to 3mm longer than L1
4.1 Electrical connection
Start
4.2 Connecting PGND Cables
Connect inverter to the grounding electrode using protection ground (PGND) cables for
grounding purposes.
Note:
Good grounding for the 20~33KTL-G2 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 20~33KTL-G2, connect the PGND cable to the ground. For the system with multiple
20~33KTL-G2, connect the PGND cables of all 20~33KTL-G2 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
20~33KTL-G2 on the wall.
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
6m2.
L3<2mm
L4<1.5mm
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 N.m using a socket wrench.
To enhance the anti-corrosion performance of the ground terminals, apply silica gel on them after connecting the
ground cable.
Figure4-1 Shows the flowchart for connecting cables to the 20~33KTL-G2
Connect PGND Cables
Connect AC Output power
Cables
End
Connect DC Input power
Cables
Connect Communication
Cables
The inverter is transformerless, Requires The positive pole and the negativepole
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
Figure4-2 Ground terminal composition
1.
OT Terminal
2.
M6 Ground Connection terminal
Note:
Figure4-4 Preparing a ground cable (2)
Figure4-3 Preparing a ground cable (1)
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20~33KTL-G2
User manual
20~33KTL-G2
User manual