INSTALLATION, USE AND
MAINTENANCE
SUNWAY STRING BOX
LT 1500V 24 INPUTS
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7.
INSTALLATION AND COMMISSIONING
7.1. Preliminary Notes
Warning
To carry out the following operations, check that the parallel string box is in
safety conditions. Please refer to section 2.8.
The following paragraphs provide information on power and signal cable connection and commissioning.
Each string must be made up of the same number of panels. All panels must have the same nominal
characteristics. Failure to observe these specifications will lead to a plant with low performance and possible
malfunctions.
Do not install devices and/or components (SPDs, return or switch terminals, joins on the cables) on the
wiring between the SUNWAY STRING BOX LT 1500V and the modules. As well as lowering the level of
plant safety and performance, malfunctions may occur.
Danger
Before carrying out the electrical installation, make sure that the following
conditions are met:
All switches of the other string boxes connected to the same inverter are open,
No string fuse is inserted.
Follow the sequence below for the electrical installation:
•
Connection of the output cable and functional earth bonding
•
Connection of the strings
Electricians must wear personal protective equipment.
7.2. Connection to the output cables and functional earth
Note
Some models may be connected to two output cables per pole. In this case connect
first the lower cable for maximum ease of installation.
Proceed as follows:
•
Remove the polycarbonate panel by only loosening the two M8 screws and by slightly pulling down the
panel since the head of the screws can pass through the holes on the panel. Then remove the panel
(Figure 11).
•
With a tester check that no voltage is applied between the output bars and between each output bar and
the earth bonding.
•
Insert the power cables already provided with cables lugs and spiral sheath, inside the string box by
letting the cable go through the coupling device of the protective spiral sheath (Figure 12).
•
Connect the cables to the + and - bars in accordance with Table 10.
•
Fasten the tubing to the tubing joints, making sure that IP65 degree of protection is not affected.
•
Insert the functional earth cable through the dedicated cable-gland (Figure 12).
•
Connect the functional earth cable to the relative terminal.
•
Tighten the cable-gland, making sure that IP65 degree of protection is not affected.
•
Reassemble the polycarbonate protective cover and tighten the two M8 screws.
