14 Installation Guide DLX series L00410622-01
2.4.2. Grounding
Appropriate grounding of the entire PV system limits voltage surges, gives a common
reference point for the conductive parts and facilitates the operation of the overcurrent
devices.
NOTICE
• Grounding must be carried out by qualified persons only and comply with local
and national electrical regulations.
• Follow the safety instructions and specifications from the different PV module
manufacturers regarding grounding requirements.
• The PV strings may be ungrounded, or grounded through either the negative or the
positive string conductors.
• The grounded DC conductors are connected to ground via the grounding strap.
• The grounded conductors must be sized according to the local and national electrical
regulations, and only carry current when electrical malfunctions occur.
• All metal parts of the DLX inverters are electrically bonded to ground through the
terminal labeled GND in the AC terminal block.
CAUTION
If the positive or negative PV conductors are grounded, then the grounding strap
must be connected to the DC ground terminal and the system must NOT be
grounded at any other point, as voltage potentials can appear and possibly
damage electrical components.
A minimum cross section area of 6.0 mm² / 10 AWG is required for the ground wire
connection.
2.4.3. DC Connections (PV)
The DC connections include wiring from the PV modules, through the combiner box, to
the inverter.
DANGER
Always disconnect the PV array before starting the connection on the DC side!
Charged DC terminals pose a risk of serious injury or death as the PV array can
supply up to 600 V
DC
to the inverter when exposed to sunlight.
WARNING
Never remove cables during operation! The inverter is charged with high voltages,
and removal of cables during operation may cause arcing
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