First Level Maintenance; Preliminary Operations; Inspections And General Cleaning; Circuit-Breaker Connections And Connections Between Circuit-Breaker And Switchboard - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

4 - First level maintenance

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
253 | © 2013 ABB | 1SDH001000R0002 - L7804
First level maintenance should be carried out in accordance with the maintenance schedule
shown on page 252.
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, disconnect 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 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 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 - First level maintenance
ABB | SACE Emax 2