Weidmüller PV DC COMBINER BOX, Operating Instructions Manual

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27 4000001903/00/04.2020
Preconditions for the commissioning
– The installation work has been made according to the
“Installation” chapter of this user manual.
– The floor around the PV DC COMBINER BOX is firm
and easily accessible so that work can be done safe.
► Wear appropriate clothes and personal protective equip-
ment.
► Use appropriate tools with the correct insulation.
A multimeter is necessary in order to verify the
absence of voltage in the live parts of the combi-
ner box.
► Check that the Multimeter is capable to read
the maximum voltage of the string and the
maximum current before starting.
DANGER
Imminent risk of life!
High voltages up to 1.000 or 1.500 V DC are
present in the live parts. Touching live parts
can result in death or serious injury due to
electric shock.
► Before starting any work in the
PV DC COMBINER BOX:
– disconnect the DC switch
– ensure that there is no current flowing
through the strings.
► Ensure that nobody reconnects the unit
while work is not finished or any operator
is still working.
► Ensure that no voltage is present in parts
that are going to be checked or that could
be accessible.
► Do not touch live components.
► If specific live parts cannot be insulated or
disconnected, it is mandatory to use addi-
tional safety elements to avoid any risk to
persons or equipment.
7.1 Main indications and checks
It is recommended to carry out a general inspection on the
PV DC COMBINER BOX and the status of the installation.
The installation must comply with either local and interna-
tional regulations.
Visual inspection
Check the following issues:
– All cables are in good condition.
– All connections of cables to the terminals are correct.
– There are no hazards around the installation that could
create any damage.
– The cables are connected to the correct polarity.
– The enclosure is firmly fixed to the structure, all mount -
ing elements are tightened properly.
– The door of the enclosure is properly closed and the
seal fits all around the door to provide the insulation. As
a check press the door while locking the key-locks a few
times.
– The cable glands are tightened correctly.
– If WM4 C connectors are used, they are fixed correctly.
– The grounding cable is connected through its own cable
gland and the cable gland is tightened correctly.
– Check the correct status of the SPD. The viewing win -
dow should be in green colour.
Additional inspections issues for the
PV DC COMBINER BOX with string monitoring:
– The RS485 wire is correctly connected to the specific
terminals inside the combiner box or alternatively to
the Transclinic RS485 connector through its own cable
gland.
– The cable gland for communications cable is tightened
correctly.
Measurements
DANGER
Imminent risk of life!
High voltages up to 1.000 or 1.500 V DC are
present in the live parts. Touching live parts
can result in death or serious injury due to
electric shock.
► Before starting any work in the
PV DC COMBINER BOX:
– disconnect the DC switch
– ensure that there is no current flowing
through the strings.
► Check the correct polarity of the positive and negative
cables of the PV strings with a multimeter.
7 Commissioning