E2.2, E4.2 And E6.2 Second Level Maintenance - ABB SACE Emax 2 Series Operating Instructions Manual
Low voltage air circuit-breaker
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4 - E2.2, E4.2 and E6.2 second level maintenance
Preliminary operations
Inspections and general
cleaning
274 | © 2023 ABB | 1SDH001330R1002 - ECN000297030
The second level maintenance must be performed in accordance with the maintenance schedule shown
on page 267.
WARNING! before proceeding with any maintenance operation, it is mandatory to:
• Set the circuit-breaker to the open position and make sure that the springs of the
operating mechanism are discharged.
• In the case of a withdrawable circuit-breaker work with it withdrawn from the fixed
part. For removal of the fixed part see paragraph"Circuit breaker racking-in/racking-out
operations" in the document 1SDH001000r0002.
Figure 154 - Remove the moving part from the fixed part.
• If work must be performed on fixed circuit-breakers or on fixed parts, disconnect the
power supply to the power circuit and auxiliary circuits and visibly ground the terminals
on both the supply side and load side.
Perform the following checks:
1.
Make sure that the circuit-breaker is clean. Remove dust and oily substances or excess grease with
a clean, dry cloth (use a mild detergent if necessary. If there is a thick build-up of dirt, use a thinner
from the greasing kit or ask for assistance from the service staff).
2.
Check that the rating plates with the technical specifications of the apparatus are present.
3.
Clean the rating plates with clean, dry rags.
4.
If the circuit-breaker is in the withdrawable version, remove all traces of dust, mould, condensation
and oxidation inside the fixed part.
5.
Make sure that there are no traces of overheating or cracks, which could impair the insulating parts
of the circuit-breaker
6.
Check the integrity of the separation pliers (for withdrawable circuit-breaker).
7.
The jaw contacts must be silvery in colour with no traces of erosion or discoloration.
8.
Make sure that there are no foreign bodies in the circuit-breaker compartment.
9.
Check for loose screws of the fixed part of the framework (M8 - 25Nm).
ABB | SACE Emax 2
Putting into service and maintenance
4 - E2.2, E4.2 and E6.2 second level maintenance
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