Danfoss DLX 4.6 Guida Utente Scaricare il pdf (Pagina 24)

24 User Guide DLX Series L00410623-1

• 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.

• Follow the safety instructions and specifications from the different PV module

manufacturers regarding grounding requirements.

• 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.

4.3.4. DC Connections (PV)

The DC connections include wiring from the PV modules, possibly through a combiner

box, to the inverter. The inverter may be configured with the optional Stringbox.

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

to the inverter when exposed to sunlight.

4.3.4.1. Array Configuration

A PV string consists of a certain number of PV modules connected in series. Strings can be

connected in parallel forming an array and attached to the inverter. The DLX inverters have

a large voltage range, and several feasible PV string configurations are possible. Follow the

module manufacturer instructions, and the local and national regulations when

configuring the PV array!

• The grounding configuration of the PV array and the connection to the DC terminals

depend on the module technology used and the local or national electrical regulations.

• The inverter is delivered from the factory in an ungrounded PV string configuration as

standard, but may be configured for positive or negative grounded PV strings.

• The configuration of a negative grounded PV string differs from an ungrounded PV

string with the addition of a grounding strap.

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Danfoss DLX 4.6 Guida Utente Pagina 24