Installation Guide

connected to different units cannot be combined. When connecting multiple strings, it
is recommended to run separate circuits to the Connection Unit or to position the
combiner box near the Connection Unit.This simplifies commissioning by allowing
testing and servicing near the inverter.
To connect the strings to the Connection Unit with glands/conduits:
1. Strip 5⁄16'' (8 mm) of the DC wire insulation.
2. Insert the DC conduit into the DC-side opening on the Connection Unit (left side at
the bottom of the Connection Unit).
3. Equipment grounding: Connect the DC equipment ground conductor to the
equipment grounding terminal block (bus-bar) in the Connection Unit.

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 to the DC+ and DC- terminal blocks, according to the labels
on the terminals. or; connect two wires (DC+ and DC-) per string:
a. Use a standard flat-blade screwdriver to connect the wires to the spring-clamp
terminals. The screwdriver blade should fit freely in the terminal opening. Too
large a blade can crack the plastic housing.
b. Insert the screwdriver and firmly tilt it to press the release mechanism and open
the clamp.
c. Insert the wire into the top opening (see Figure 28 ).
d. Remove the screwdriver – the wire is automatically clamped.
CAUTION!
Ensure that the Plus (+) wire is connected to the + terminal and that the Minus
(-) wire is connected to the Minus (-) terminal connector.
 ATTENTION!

Veillez à ce que le câble Plus (+) soit connecté au terminal + et que le câble -
soit connecté au connecteur 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.
Three Phase Inverter with Synergy Technology Installation MAN-01-00401-1.5
48 Connecting the Strings to the Connection Unit