SE14.4K SetApp Enabled Inverter Installation
Connecting the Strings to the Safety Switch
You can connect systems with multiple DC strings in parallel to the DC input terminals
of the switch. Inverters have one, two or three pairs of DC input terminals, depending
on the inverter power rating. If more strings are required, they can be connected in
parallel using an external combiner box before connecting to the switch. When
connecting multiple strings, it is recommended to run separate circuits to the Safety
Switch or to position the combiner box near the switch. This simplifies commissioning
by allowing testing and servicing near the inverter.
To connect the strings to the safety switch:
1. Strip 5⁄16'' (8 mm) of the DC wire insulation.
2. Insert the DC conduit into the DC-side drill guide that was opened.
3. Equipment grounding: Connect the DC equipment ground conductor to the
equipment grounding terminal block in the Safety Switch.
NOTE
Functional Electrical Earthing of DC-side negative or positive is prohibited
because the inverter has no transformer. Equipment grounding of exposed
conductive surfaces in the array is required per the NEC.
4. Connect the DC wires:
CAUTION!
Ensure that the Plus (+) wire(s) is connected to the (+) terminal and that the
Minus (-) wire is connected to the Minus (-) terminal connector.
ATTENTION!
Veillez à ce que le câble(s) Plus (+) soit connecté au terminal (+) et que le câble
(-) soit connecté au (-) terminal.
NOTE
For systems with four PV strings per unit or more, fuses
may need to be installed in both the positive and negative
conductors as required by NEC Article 690.9. For more
information, refer to the “String Fusing Requirements
in SolarEdge Systems” technical note at
http://www.solaredge.com/files/pdfs/string_fusing_requirements.pdf.
NOTE
SolarEdge's fixed input voltage architecture enables the parallel strings to be of
different lengths. Therefore, they do not need to have the same number of
power optimizers, as long as the length of each string is within the permitted
range.
-Three
Phase
System
Installation
Guide
MAN-01-00527-1.2
48 Connecting the Strings to the Safety Switch