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DSP 3320i-ODS, DSP 3325i-ODS, DSP 3333i-ODS
User manual
4.1 Electrical connection
Figure4-1 Shows the flowchart for connecting cables to the DASS TECH inverter
Start
Connect PGND Cables
Connect DC Input power
End
Cables
4.2 Connecting PGND Cables
Connect inverter to the grounding electrode using protection ground (PGND) cables for
grounding purposes.
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
Note:
Good grounding for the DASS TECH 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 DASS TECH inverter, connect the PGND cable to the ground. For the system with
multiple DASS TECH inverter, connect the PGND cables of all DASS TECH 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
DASS TECH inverter on the wall.
Figure4-2 Ground terminal composition
1. OT Terminal
2. M6 Ground Connection terminal
Connect AC Output power
Cables
Connect Communication
Cables
2
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DSP 3320i-ODS, DSP 3325i-ODS, DSP 3333i-ODS
User manual
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
6m2.
Figure4-4 Preparing a ground cable (2)
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.
Note:
To enhance the anti-corrosion performance of the ground terminals, apply silica gel on them after connecting the
ground cable.
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L2=L1+(2-3)mm
L1
L3<2mm
L4<1.5mm
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