ABB V-Contact VSC Series Installation And Service Instructions Manual page 30

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7. Maintenance
Maintenance operations are aimed at ensur-
ing trouble-free operation of the apparatus for
the longest possible time. The following opera-
tions must be carried out in accordance with
the IEC 61208/DIN 31051 Standards:
Inspection: Assessment of the actual condi-
tions
Servicing: Measures to be taken to main-
tain the specified conditions
Repairs: Measures to be taken to restore
the specified conditions.
7.1. General
• Maintenance must be carried out by
!
ABB personnel or by suitably quali-
fied customer personnel with in-
depth knowledge of the apparatus
and of the installation (IEC 60694,
CEI EN 60694 par. 10.4.2.).
Should maintenance be carried out
by the customer's personnel, re-
sponsibility for the interventions lies
with the customer.
• Before carrying out any mainte-
nance operation, always check that
the apparatus is in the open posi-
tion.
• Check that the medium voltage and
auxiliary power supply are turned
off. Maintenance of the apparatus
must only be carried out with the
contactor without power supply and
racked out of the enclosure com-
partment and with the capacitor
suitably discharged.
Notes
The following rules must be respected for all maintenance
operations:
– the relative specifications indicated in the "Standards
and specifications" chapter;
– the regulations for safety in the workplace indicated in
the "Putting into service and running" chapter;
– the regulations and specifications in the country of in-
stallation.
It is good practice to keep a maintenance card
and a service book where all the operations
carried out can be noted down in detail, together
with the date, description of the anomaly and
the references of data needed to identify the
apparatus, etc. (see chapter 2).
Experience gained in use of the apparatus will
allow the optimal time intervals for interventions
to be established. In any case, inspection of
the apparatus not more than one year after it
has been put into service is recommended.
In case of need and for further details, please
refer to what is prescribed in article 10.4.2 of
the Standard (CEI EN 60694).
In any case, for any problems, please do not
hesitate to contact us.
7.2. Inspection
– Carry out regular inspections to check that
the interruption devices are in good condi-
tion.
– The checks must include a visual inspection
to find any contamination, traces of corrosion
or electrical discharge phenomena (accord-
ing to what is prescribed in table 4 (see next
page).
– When there are unusual service conditions
(including adverse climatic conditions) and/
or in the case of environmental pollution (e.g.
heavy contamination or an atmosphere with
aggressive agents), the frequency of inspec-
tions must be increased.
– Visual examination of the main contacts. The
contact areas must be cleaned if there are
signs of overheating (discoloured surface)
(also see the paragraph on "Repairs").
If any anomalous conditions are found, appro-
priate maintenance measures must be taken
(see the "Servicing" paragraph).