SolarEdge SE K Series Installation Manual page 56

3. Loosen the Allen screws of the DC terminals.
4. Strip 7.9" 200 mm of insulation from the DC wires.
NOTE
Before connecting aluminum wires to the terminals:
a. Remove oxide from the exposed wires with emery paper or a steel wire
brush
b. Clean dust with a cloth and Isopropyl alcohol (IPA)
c. Coat wires with a designated antioxidant aluminum wire grease
immediately after cleaning
CAUTION!
Connection of oxidize aluminum wires may result in resistance and high
temperatures at contact points.
5. Route the DC wires to the DC+ and DC- terminals on the DC+ and DC- boards of the
Synergy Manager (see DC+ and DC- indications on the DC boards).
CAUTION!
The DC boards have three pairs of DC terminals. Each pair is connected to a
single Synergy Unit (Left, Center and Right).
When installing a system with more than three PV strings per a single
Synergy Unit (whether connected directly or via a combiner box), fuses are
required. In SolarEdge system, 25A fuses must be used (see Figure 24 ).
NOTE
Functional electrical Earthing of DC-side negative or positive poles is
prohibited because the inverter has no transformer. Grounding (earth
ground) of module frames and mounting equipment of the PV string
modules is acceptable.
6. Insert the DC wires into the DC terminals and fasten the 5 mm Allen screw to a
torque of 3.7 ft.*lb for 4 AWG wires or 5.9 ft.*lb for 3 to 2 AWG wires.
CAUTION!
DO NOT use an impact driver or any electrical tool to fasten the terminal
screws.
CAUTION!
Ensure that each Plus (+) wire is connected in corresponds to its Plus
(+)terminal.
Three Phase Inverters with Synergy Technology PN: SExxK-xxxxIxxxx
Chapter 4: Connecting PV Modules and AC to the Synergy Manager 55