Inspections And Functional Tests Interruption Device In General; Servicing - ABB VM1 Installation And Service Instructions Manual

A functional test of the drive must be carried out:
• when the number the number of operating cycles indicated
has been exceeded, or
• during maintenance operations.
Before carrying out the functional test, open the circuit-
breaker and:
• take it to the test position (withdrawable circuit- breaker) or
• isulate the working area and make it safe in conformity with
the safety rules and according to the regulations in force
(fixed circuitbreakers)
• follow the procedure for discharging the capacitor
• carry out a visual inspection of the state (removing the front
panel), e.g. of:
- lubrication of the ball bearings
- the operation counter
- assembly of the sensors
- the position indicator.
Functional test:
• Connect the power supply voltage.
• Carry out several no-load operations. This test particularly
applies to circuit-breakers which are rarely activated under
normal conditions.
To check the capacitor, carry out a rapid O-CO cycle of
operations of the circuit-breaker, by pressing the pushbuttons
on the front of the circuit-breaker in rapid succession.
• The LEDs on the inductive sensors are activated as soon
as the circuit-breaker has reached the closing and opening
limit positions.
Note
These operations can only be carried out by ABB personnel or suitably qualified
and specially trained personnel.
Circuit-breaker pole
The circuit-breaker pole and relative vacuum interrupter are
maintenance-free up to the maximum number of electrical
operations foreseen for the type of interrupter.
The operating life of the vacuum interrupter is defined by the
sum of the ultimate currents corresponding to the specific
type of interrupter in accordance with what is indicated in the
graphs of par. "Trip curves": when the sum of the ultimate
currents is reached, the complete pole must be replaced.
note
Dismantling and replacement of the pole can only be carried out by ABB
personnel or suitably qualified and specially trained personnel, especially for the
necessary adjustments.
8.6. Inspections and functional tests
interruption device 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
contamination or an atmosphere with aggressive agents).
– Visual examination of the isolating contacts.
Turning the system of contacts alternately is recommended,
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 the paragraph
on "Repairs").
– If any anomalous conditions are found, appropriate
servicing measures must be taken (see the paragraph on

"Servicing).

8.7.Servicing
interruption device in general
If cleaning is found to be necessary during the inspections, as
specified in par. "Operations before putting into service", use
the following procedure:
• insulate the working area and make it safe by following the
safety regulations specified in the IEC/DIN VDE Standards.
• general cleaning of the surfaces:
- dry and eliminate any light deposits of dirt using a soft dry
cloth;
- more resistant deposits of dirt can be removed using a
slightly alkaline household cleanser or Rivolta BWR 210
type detergent.
• cleaning the insulating surfaces and conductive
components:
- light dirt: with Rivolta BWR 210 detergent;
- resistant dirt: with cold 716 type detergent.
After cleaning, rinse thoroughly with clean water and dry
carefully
note
Only use halogen-free detergents and never trichloroethane, trichloroethylene or
carbon tetrachloride!
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