Connection Of Pv Modules - Delta SI 3300 Bedienungsanleitung

6.7

Connection of PV modules

Before the photovoltaic system is connected, the polarity of the PV voltage at the Tyco connectors
must be checked to ensure that it is correct. The connectors are colour-coded red (+) and blue (-).
The connection of the PV module is implemented using Tyco Solarlok connectors, where the DC
negative pole is located on the connector upper row and the DC positive pole on the connector
lower row. The connectors are coded to prevent you from accidentally plugging them into the wrong
terminal.
Please ensure the following at all times:
• That there is never any risk of anyone coming into contact with the solar inverter connection
terminals, due to the risk of dangerous voltages across them.
• That under no circumstances the PV modules are disconnected from the solar inverter under
load. If a disconnection should be necessary, first switch the grid off so that the solar inver-
ter cannot absorb any further power. Next, open the upstream DC disconnect switch.
The maximum input voltage of the solar inverter is 540 V. The maximum current load of each indi-
vidual Tyco connector is 25 A.
The solar inverter has an insulation and grounding monitoring on the DC side. The options can be
configured in the Setup menu "6. S -> Solar ISO / GND" (see page 19, section 7.3.7).
The insulation monitoring has two modes:
• ISO-ON-Error (the solar inverter is disconnected from the mains in the event of an insulation
fault)
• ISO-ON-Warning (the solar inverter indicates the fault but is not disconnected from the mains).
Deltas solar inverters are factory-set to ISO-ON-Warning mode on delivery.
The grounding monitoring has two modes:
• PV+ grounding (grounding monitoring of the positive pole of the PV generator)
• PV- grounding (grounding monitoring of the negative pole of the PV generator).
In these modes the solar inverter remains in feed-in operation and will not be disconnected from
the mains in case of a fault. The error message "PV+ grounding fault" or "PV- grounding fault" will
appear on the display.
If you need to connect the positive or negative pole of the PV system to meet requirements set
out by the module manufacturer, you can do this. Earth continuity must be implemented close to
the inverter. We suggest using Deltas grounding kit "Grounding Set A Solar" (EOE 99000115). The
grounding connection is monitored and should be configured in the Setup menu (see above).
Alternatively, it is possible to turn off the insulation- and grounding monitoring:
• ISO / GND OFF.
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