Maintenance Operations - ABB Sace Emax 2 Installation, Operation And Maintenance Instructions For The Installer And The User
Low voltage air circuit-breakers
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4 - Maintenance operations
Preliminary operations
Inspections and general
cleaning
Circuit-breaker connections
and connections between
circuit-breaker and
switchboard
58 | © 2022 ABB | 1SDH000999R0002 - ECN000232533
The maintenance operations must be carried out in accordance with the maintenance plan indicated on
page 57.
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, extract the circuit-breaker from the fixed
part (see the indication DISCONNECTED)
• 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 and 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.
Make sure that there are no foreign bodies in the circuit-breaker compartment.
Perform the following checks on the connections:
1.
With dry paint-brushes and rags remove dust or soil, if present (use a non- aggressive detergent
if necessary. Use a cleaning product such as Henkel 273471 or Chemma 18 or equivalent if there is
a heavy coating of dirt).
2.
Make sure there there are no traces of overheating on the terminals. Overheating is detected by
a different coloration of the parts in contact; the contact parts are usually silvery white in colour.
3.
Check the tightness of fastening bolts for all connections to the terminals
WARNING! 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 earth the terminals
on both the supply side and load side.
Putting into service and maintenance | 4 - Maintenance operations
ABB | SACE Emax 2
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