Maintenance Operations; Preliminary Operations; Inspections And General Cleaning; Circuit-Breaker Connections And Connections Between Circuit- Breaker And Switchboard - ABB SACE Emax 2 Installation, Operation And Maintenance Instructions
Low voltage air circuit-breakers
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4 - Maintenance operations
Preliminary operations The following are the operations to be carried out:
Inspections and general
cleaning
Circuit-breaker connections and
connections between circuit-
breaker and switchboard
100 | © 2014 ABB | 1SDH000999R0002 - L8569
The maintenance operations must be carried out in accordance with the maintenance plan indicated to page
99.
1.
Open the circuit-breaker and make sure that the springs of the operating mechanism are unloaded.
2.
In the case of a withdrawable circuit-breaker, extract the circuit-breaker from the fixed part (see the
indication DISCONNECT)
WARNING! if work must be performed on fixed circuit-breakers or on fixed parts, discon
nect the power supply to the power circuit and auxiliary circuits and visibly earth the
terminals on both the supply side and load side.
Perform the following checks:
1.
Check the cleanliness of the circuit-breaker, removing any dust or oily traces or excess grease using
a clean, dry rag (possibly using mild detergent. Use a cleaning product such as Henkel 273471 or
Chemma 18 or equivalent if there is a heavy coating of dirt).
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, discon
nect 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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