Weidmüller PV DC COMBINER BOX, Operating Instructions Manual

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19 4000001903/00/04.2020
Installation
Input connections via PV connectors
Both connectors (box connector and field con -
nector) must be from the same brand and same
model to ensure the correct performance and
reliability of the solution. Please assure that there
is 100% compatibility between both connectors.
Weidmüller supplies the range of combiner box-
es with WM4 C terminals, so it is mandatory the
usage of same connector.
If another connector should be used, this needs
a specific authorisation by Weidmüller.
With PV connectors there is no need to get access inside
the PV combiner box because all the cabling is already
done. The installer has only to connect the DC string ca-
bles to the PV connectors at the bottom side of the enclo-
sure by using a WM4 C connector or PV-Stick.
To read more about these connectors, please check oper -
ating instructions on the Weidmüller website.
► Follow the instructions in the user manual coming with
the PV connectors.
Figure 5.7 Connection of the PV connectors
► Pull down the cables to assure that all of them are well
connected.
5.7 Connection of the outputs
The output connections depend on the design of each
tailor-made PV DC COMBINER BOX. The output cables
must be connected to the poles of the switch disconnector
or to the terminals prepared for this purpose. Regard the
delivered datasheet for the cable glands and a description
of the clamping area.
Please ensure that the cable that you are going to use fits
with the specifications.
– The cross section of the conductor must be selected ac-
cording to the rated current of the system and to the size
of the cable gland of the combiner box.
– Use copper or aluminium cables only. When using alu-
minium cables regard the section "Preparing aluminium
conductors" before starting the installation.
– Weidmüller is not responsible for the performance of the
terminal lugs, terminal ring or terminal cage neither the
output cable selected.
WARNING
Do not operate under load.
A serious damage on persons and equipment
can occur by high voltage.
► If string cables form the field are connect -
ed into the terminals, ensure that the pow-
er supply is disconneted.
► Ensure that the DC switch disconnector is
in OFF position.
► Ensure that there is no voltage in the out-
put cables and that all safety measures
have been considered.
► Before starting the installation check that the
terminal lugs will fit through the cable glands.
► Insert the DC main cables through the cable glands into
the enclosure.
► Regard the polarity when connecting the DC conductor
to the appropriate terminal lug, ring terminal or cage ter-
minals and follow the instructions of that component to
crimp it in the right way.
► Connect the DC conductors to the stud terminals or di-
rect to the switch-disconnector.
► Check the terminal in the electrical drawing provided
with the combiner box.
► Check and apply the right tightening torques to the ter -
minal lugs of the switch disconnector (the correct tight-
ening torques can be found in the specific documenta -
tion inside each PV DC COMBINER BOX).
► Tighten the cable glands.
► Make sure there is sufficient strain relief for the DC main
lines/DC feeder cables.
► Close all unused cable glands with blanking plugs to
prevent moisture penetrating the combiner box.