Weidmüller PV DC COMBINER BOX, Operating Instructions Manual

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10 Maintenance and Service
10.1 Maintenace
The PV DC COMBINER BOX is a product with
minimum maintenance.
► Carry out a visual inspection once per year
checking the issues listed below.
DANGER
Imminent risk of life!
High voltages up to 1.000 or 1.500 V DC are
present in the live parts.
► Ensure that the product is switched off and
that it is free of hazardous voltage (from
generator side and from inverter side).
Check list for the annual inspection of the PV DC COMBINER BOX
Remarks Issue Checked
Enclosure and seals
Temperature fluctuations on outdoor sites strain the
seals.
► Check that the cover seals are in proper condition.
Porous or squeezed seals decrease the tightness
and therefore the IP class of the enclosure.
► Check that there is no or dust inside the enclo -
sure.
Humidity inside the enclosure can cause corrosion. ► Check the seals and screw connections as well as
the drainage inserts.
► Check that there are no signs of corrosion, water
or humidity inside the enclosure.
Regard the tightening torques in the specific docu -
mentation inside each PV DC COMBINER BOX.
► Check the cable glands and retighten them if
needed.
Surge protection arresters (optional)
The inspection windows of the surge arresters should
be green.
► Replace each surge arrester the inspection win-
dow of which is red.
The PV DC COMBINER BOX has a mark on all
screws and nuts to indicate the torque position. If the
mark is unchanged since the previous inspection,
there is no loss of torque.
Regard the tightening torques in the specific docu -
mentation inside each PV DC COMBINER BOX.
► Check if any of the marks on screws and nuts
have been changed.
► Retighten the screws if needed.
Fuses
Blown fuses diminish the yield of the PV plant. ► Check the continuity of all fuses.
DC switch
The PV DC COMBINER BOX has a mark on all
screws and nuts to indicate the torque position. If the
mark is unchanged since the previous inspection,
there is no loss of torque.
Regard the tightening torques in the specific docu -
mentation inside each PV DC COMBINER BOX.
► Check if any of the marks on screws and nuts
have been changed.
► Retighten the screws if needed.