Checking The Wiring - SMA SUNNY ISLAND 4.4M Operating Manual

SMA Solar Technology AG
7. Ensure that the seal insert is positioned correctly in the cable gland.
8. Tighten the swivel nut of the cable gland (torque: 2.6 Nm).
6.7

Checking the Wiring

Ensure that you carry out all tests relevant to the system and rectify all detected problems. Tip: Tests can be
documented directly in the tables. Cross out all tests not applicable.
Requirement:
☐ All Sunny Island inverters must be disconnected from all voltage sources (see Section 12, page 126).
Checking the Grounding
Test point
Enclosure opening ExtVtg
Cable length at the ExtVtg connec-
tion
Conductor cross-section of the
grounding conductor at the AC1
and AC2 connections
Grounding conductor connection to
ground
With a TN system, neutral conductor
and grounding conductor connection
Grounding of the battery
Checking the Additional Grounding
If the battery is grounded, you must check the additional grounding on the Sunny Island.
Test point
Conductor cross-section for the addi-
tional grounding
Connection of additional grounding
Grounding conductor connection to
ground
Connecting the Sunny Island Inverter
Test point
Enclosure opening for DC
Operating manual
Test criterion
Enclosure opening is sealed with a filler plug or M20 cable gland.
The cable diameter of the cable must be 7 mm to 14 mm for an M20
cable gland.
The cable length must be less than 30 m.
If 1 grounding conductor is connected, the conductor cross-section must
be at least 10 mm². If 2 grounding conductors are connected, the
cross-section of each conductor must be at least 4 mm².
The grounding conductor must be threaded through a ferrite.
The grounding conductor must be grounded, e.g., by connection to a
grounding busbar or a foundation ground electrode.
Ensure by measuring that there is a conductive connection between the
neutral conductor and the grounding conductor.
Ensure that the battery is not grounded unintentionally.
If the battery has been grounded intentionally, ensure that the conduc-
tor cross-section is sufficient (see Section 6.4, page 34).
Test criterion
The conductor cross-section must correspond to the grounding of the
battery.
Hexagon socket screw is screwed tight (torque: 4 Nm to 5.7 Nm).
The grounding conductors must be grounded, e.g., by connection to a
grounding busbar or foundation ground electrode.
Test criterion
In the cable gland M32, the diameter of the DC power cable must be
14 mm to 25 mm.
6 Electrical Connection
SI44M-80H-13-BE-en-15
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