18
Installation
Guide
DLX series L00410622-01
DANGER
Be aware of high currents! If the DC terminals are mixed up during connection,
high currents are generated in the conductors, which can pose shock hazards.
Procedure
•
Turn OFF the DC switch(es) and the AC circuit breaker(s).
DANGER
The PV conductors are still charged after the DC switch in the Stringbox is turned
OFF, due to power fed from the PV modules. Always turn OFF the remote DC
switch and wait until the PV modules do not feed power.
•
Remove the PV connectors.
•
Check with a voltmeter if the terminals are discharged.
•
Disconnect the conductors from the terminal block.
•
Connect the conductors to the correct terminal block.
•
Test the polarity using a voltmeter before turning ON the DC switch(es) and the AC
circuit breaker(s).
2.4.3.4. Jumper Position for the System Grounding Setup
The jumper above the
- NEG
terminal in the customer connection area monitors the
arrangement of the DC connection according to the grounding setup. When delivered, the
jumper is positioned for an ungrounded string. Depending on the requirements from the
module manufacturer, the jumper must be pulled up and positioned correctly to match
the grounding of the DC conductors.
In case of discrepancy the following message will appear in the display: “
Fuse fault.
”
Table 2.4.1: Jumper position for the grounding setup
Connection Area
Top view
System
Ungrounded PV String Configuration:
There is no connection between the pins.
Positive grounded PV String
Configuration:
The jumper short-circuits the
two leftmost pins.
Negative grounded PV String
Configuration:
The jumper short-circuits the
two rightmost pins.
