INSTALLATION GUIDE
MODULAR SUNWAY TG
TE OD
Rev. 03
– 01/06/2018
113/
139
Access to the PV system components for the purpose of maintenance, modifications and management
involves all persons responsible for production and maintenance. It must be carried out in observance of
the health and safety regulations described in section 2.5.
11.6.1. Fault containment
The following prescriptions are of a general nature.
•
Place the equipment affected by the fault in safety conditions. This operation may involve stopping
and disconnecting all the up- and downstream devices. Please refer to section 2.4.
•
If the fault has occurred inside an inverter, press an emergency stop button to cut the inverter off up-
and downstream. Open the disconnect switches of all the string boxes so that the entire DC input
section is safe.
•
In multi-inverter systems it is usually sufficient to cut off the inverter affected by the fault both up- and
downstream so that the other inverters can remain in operation.
•
If the fault has occurred in one of the components downstream from the inverter (AC parallel cabinet,
external transformer, metering cabinet etc.) STOP all the machines and then press the emergency
stop button to cut off the inverter both up- and downstream.
•
If the fault has occurred in one of the components upstream from the inverter (String Box, etc.) STOP
all the machines and then press the emergency stop button to cut off the inverter both up- and
downstream. Open the disconnect switches of all the String Boxes so that the entire DC input section
is safe.
•
If the fault has occurred in one of the String Boxes, please refer to the relevant User Manual.
•
Proceed with analysis of the causes and consequences of the fault.
NOTE
If necessary, please contact the Elettronica Santerno SpA CUSTOMER SERVICE.
11.6.2. Fault analysis
This section covers the main principles to be observed when analysing the causes and consequences of
faults.
A PV inverter usually operates as part of an overall system. All the components adopt various protective
measures therefore, in general, the consequences of a generic fault affecting an upstream component or
element does not extend to other components downstream.
However, the causes and the consequences of any faults which may arise need investigating on the plant
as a whole.
Fault investigation and analysis activities represent one of the most hazardous tasks assigned to
maintenance technicians. This manual only provides indications of an extremely generic nature concerning
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 status 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.
•
If faults have occurred on each box, inverter and/or the system:
Check for any earth faults on the DC side and the AC side.
