Weidmuller PV Next String Combiner Box Bedienungsanleitung Seite 42

8 Maintenance
The product is low-maintenance. The connections of all DC
cables are designed as maintenance-free, self-adjusting
PIJSH IN spring-loaded terminals.
A visual inspection must be carried out once a year.
More intensive maintenance and inspection of all com-
ponents must be carried out at least every five years.
During maintenance work, make sure that no
moisture, dust or foreign objects can penetrate
into the product.
Two procedures are permitted for maintenance
work:
Working on live components: Only electricians
who are qualified to work on live components
may work under voltage. They must comply
with local regulations (e.g. personal protective
equipment and risk assessment).
Voltage-free working: Input and output cables
must be properly disconnected and secured
against being switched on again. Voltage-free
work may be carried out by electricians and
trained personnel.
8.1 Annual visual inspection
Imminent danger to life!
Up to 1,100 V DC can be applied to live parts.
The system must be switched off for this work.
Switch off the system as described in chap-
ter 2.2.
Check the product, all PV connectors, cable glands and
all cables for damage.
Check the legibility and fixation of the warning symbols
on the enclosure cover. The legibility may be impaired
by weather conditions or UV radiation.
Check the outer control panel of the switch-disconnector
for damage.
Check the seal in the enclosure
damaged and flexible. A porous seal or cracks can lead
to leaks.
Check the PCB, the fuse holders and all PCB terminal
blocks for damage.
Check the earthing connection for tight fit (observe
torque).
Check the clamping points on the switch-disconnector
for tight fit.
Check whether the surge voltage arresters have tripped,
Green = 0K, Not green = replace immediately.
In the event of damage, contact your Weidmüller repre-
sentative or distributor.
42 Weidmüller
DANGER
cover. It must be un-
The fuse holders have a silver layer which can
discolour due to oxidation and sulphation. This
discolouration does
fect as it does not affect the electrical properties.
8.2 Checking and replacing fuse links
Imminent danger
Fuse links must
under load. The system must be switched off
for this work.
Switch off the system as described in chap-
ter 2.2.
Before removing a fuse link, make sure that
no current is flowing through it. Equalising
currents between the string cables can also
lead to life-threatening arcing and cause
damage to the product.
Ensure that the open circuit voltages of the
string cables are identical before you insert
the fuse links or connect the string cables
to the input terminals. Non-observance can
lead to dangerous arcing due to equalising
currents.
ATTENTION
The product can be destroyed!
Fuse links with an incorrect sulface finish can damage
the product (e.g. nickel or tin coatings).
Only use fuse links with silver-coated end caps.
Fuse links must be replaced if they are visibly
damaged or do not pass the continuity test.
For this work you need suitable tools:
Fuse change pliers or combination pliers
Multimeter
Remove the cover from
Pull the fuse link out of the fuse holder with the tool per-
pendicular to the PCB, without bending the fuse holder.
Check the fuse holder visually for damage and the cor-
rect seating of the overspring.
If the fuse link has no visible damage, check it with a
multimeter in the "continuity" setting (resistance meas-
urement).
— Conductive fuse links
not constitute a technical
DANGER
to life!
not be removed or inserted
the enclosure.
can continue to be used.
2690250000/05/10.2022
de-