ABB eVM1 Installation And Service Instructions Manual page 33

Also see the IEC 62771.200 Standard.
The data on the useful life are in principle applied to all the components which are not directly
affected by the operator.
The useful life of the manually activated components (movement of the withdrawable truck, etc.)
can vary according to the type of handling.
The time intervals and amount of maintenance are determined by environmental agents, by the
frequency of operation and by the number of trip operations under short-circuit.
11.1.2. Procedure for discharging the capacitor/s
Activate the circuit-breaker.
Disconnect the power supply voltage.
Operate the circuit-breaker by pressing the pushbuttons with the following cycle: O-C-O
The luminous "Unit Ready" signal turns off when the operation cycle has been completed, i.e. when
the circuit-breaker is no longer ready for operations.
After 1 minute have passed, the capacitor voltage drops to a value of less than 15 V (circuit-
breaker with A2 actuator and in closed position).
If required in specific cases, further information can be obtained from the technical documenta-
tion regarding the switching apparatus (e.g. any special service conditions agreed on), as well as
from this instruction manual (see par. 14.15)..
11.1.3. Drive with magnetic actuator
The drive with magnetic actuator is maintenance-free up to the number of operation cycles indi-
cated in paragraph 11.1.1.
11.2. Inspections and functional tests
11.2.1. Interruption devices in general
– Carry out regular inspections to check that the interruption devices are in good condition.
– Inspection at fixed intervals can be waived when the apparatus is permanently monitored by
qualified personnel.
– Above all, the checks must include a visual inspection to check for any contamination, traces of
corrosion and electrical discharge phenomena.
– Carry out more frequent inspections when there are unusual operating conditions (including
adverse climatic conditions) and in the case of environmental pollution (e.g. heavy contamina-
tion or an atmosphere with aggressive agents).
– Visual examination of the isolating contacts. Turning the system of contacts alternately is rec-
ommended, in order to keep the internal surface of the contact areas clean. The contact areas
must be cleaned if there are signs of overheating (discoloured surface) (also see paragraph 11.4
"Repairs").
– If any anomalous conditions are found, appropriate servicing measures must be taken (see para-
graph 11.3 "Servicing").
11.2.2. Circuit-breaker pole
No check is required apart from what is already specified in par. 11.3.3.
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