INSTALLATION, USE AND
MAINTENANCE
SUNWAY STRING BOX
LT 1500V 24 INPUTS
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the precautions which must be adopted when fault investigation and analysis activities need to be carried
out on live components.
In the event of a fault, before proceeding to resolve the problem, the following tasks must be performed to
evaluate:
•
The state of components and the system as a whole:
•
Check the state of the contacts.
•
Check the state of cables.
•
Check the state of any interface protection installed in the system.
•
Check the state of all protective elements installed in the system.
•
Check the state of any auxiliary power supplies.
•
Check the level of humidity present on system components.
•
Possible faults that may occur on each box, inverter and/or the system:
•
Check for any earth faults on the DC side and the AC side.
•
Make sure that all prescriptions have been observed relative to the neutral connection or those relative
to field configuration (floating, Positive Earthed, Negative Earthed).
•
Check the state of the SPDs.
Once all the aforementioned steps have been performed, proceed with evaluating:
•
The causes of faults.
•
The consequences of faults on the electrical, electromechanical and electronic components.
•
The steps to be taken to remove the cause of the fault.
Once all the aforementioned steps have been performed, proceed with rectifying the causes of the fault.
10.2.1. SPDs Tripped
•
If the SPDs have tripped, replace the cartridges after placing the string box in safe conditions.
Prohibition
It is forbidden to use cartridges different from the ones installed (same brand
and model required).
Please refer to section 11.6.4.
10.2.2. String Fuse Blown
This section describes faults relevant to one or more SUNWAY STRING BOX LT 1500V fuses blowing. If a
fuse blow, procedures cannot be limited to simply replacing the fuse. Suitable analysis of the fault which
caused the problem must be also carried out.
Note
After replacement, if the fuse blows again, please contact Enertronica Santerno SpA
CUSTOMER SERVICE.
Before replacing a blown fuse, all the tasks described in section 10.1.1 and 10.2 must be performed.
10.3. Disconnecting a String
Danger
Disconnecting a string is allowed only if no current flows in the relative cable,
as it is forbidden to open the fuse-holders, remove the connectors of the string
box, when present, and the connectors of the PV modules under load. If the
safety fuse has not blown, current may flow if a short-circuit is to be found in
the string to be removed. Check polarity of each string before connecting it to
the product.
Carry out step 2 below at night if you are not sure that no current is flowing.
Procedure:
1.
Open the disconnector inside the string box.
2.
Open the fuse-holders inside the string box.
3. Remove the cable harnessing ties.
4. Loosen the cable glands of the string to be disconnected.
