Danfoss DLX 2.0 Installation Manual page 17

Positive Grounded PV String
Figure 2.4.8: Positive grounded PV string
2.4.3.2. Connection Procedures
• The DC conductors connecting the PV array to the inverter must each have a minimum
rating of 600V at all given operating temperatures.
DC
• 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
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.
Installation Guide DLX seriesL00410622-01
• 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 2
to16 mm / 10
17