Installation Guide
DLX seriesL00410622-01
17
Positive Grounded PV String
Figure 2.4.8: Positive grounded PV string
•
Connect the
positive connectors (+)
to
the terminals labelled
2.Grounded
and
the
negative connectors (-)
to the
terminals labelled
1.Ungrounded
.
•
Switch the conductors connected to
N4
and
P4
(
fig. 2.4.6
).
•
Connect the
grounding strap
between
N5
in the Stringbox (
fig. 2.4.6
) and the
DC
ground receptacle
labelled
GND/PE
in the
inverter lower compartment
.
2.4.3.2. Connection Procedures
•
The DC conductors connecting the PV array to the inverter must each have a minimum
rating of 600V
DC
at all given operating temperatures.
•
The DC conductor cables must be sized for correct temperature rating and sunlight
resistance. Use copper wire with a cross-section area of between 6 mm
2
to16 mm
2
/ 10
AWG to 6 AWG and temperature rating 90° C for all connections. Ensure compliance with
the relevant national electrical regulations!
•
Conductor insulation rating must be higher where the backs of the modules cannot
receive cooling or where the ambient temperature exceeds 40° C. Note the relevant
national electrical regulations!
String Connectors
•
The corresponding mating connectors must be provided by the system installer.
•
Follow the guidelines from the connector manufacturer when choosing cable sizes and
assembling them in the connectors.
•
Plug in the connectors and hand-tighten them to the corresponding connector on the
inverter.
•
Check if the contacts are firmly tightened by pulling them gently.
•
Only valid for France: Removal of the connectors requires a special tool. Note the
relevant national electrical regulations!
2.4.3.3. Reversed DC Connection
If the positive and negative conductors are connected to the wrong terminals, the inverter
will not start up
.
The inverter is not damaged due to internal reverse blocking diodes, but
high currents are generated in the conductors.
