3 System Installation
25
3.6.4 Preparation before operation
DANGER
1.
When connecting cables, do not operate energized and follow the relevant requirements in “
1 Safety
Precautions
”.
2.
Before connecting the cables, please complete the following preparations to avoid personal injury.
1)
Before making electrical connections, make sure that the "DC SWITCH" of the inverter is in the "OFF"
state, otherwise the high voltage of the inverter may cause a shock hazard.
2)
Determine the positive and negative poles of the input cable and mark them. Make sure the input
cable is disconnected from the PV string (Ensure that the cable is not live when crimping the input
MC4 terminal).
3)
Verify that the open circuit voltage of the PV string does not exceed the specified limit.
3.
When connecting the input cable, make sure that the positive and negative terminals of the input cable
correspond to the positive and negative terminals of the PV inverter of the string inverter.
Note: The following figures are using 9-input string inverter for example, which is similar with the structure of
other models.
3.6.5 Connecting ground
By protecting the ground wire, the inverter is connected to the grounding bar to achieve the purpose of
grounding protection. The ground wire connection is affixed with a PE mark. The ground cable diameter
is not less than 16mm
2
. The bolt size is M6.
Figure 3-9 Protective grounding
For the grounding of multiple string inverters, use a single point grounding instead of winding the
ground wire into a ring shape. As shown below.
(a) Correct grounding method for multiple string
inverters
(b) Multiple string inverters with incorrect grounding
Figure 3-10 Multi-string inverter grounding
