ABB SACE Tmax XT7 Instrucciones De Mantenimiento página 6

6
Inspection and general cleaning
The operations for routine and emergency maintenance of the unit must be performed by qualified personnel with a detailed knowledge of
the unit.
Before taking any action:
- open the circuit breaker and make sure that the control springs are not loaded;
- in the event of a withdrawable cicruit breaker, take action with the circuit breaker withdrawn from the fixed part;
- when taking action on circuit breakers with a fixed design, or on the fixed parts of a withdrawable breaker, disconnect
the supply to the power circuit and to the auxiliary circuits, and earth the terminals in a clearly visible manner, both
on the power side and on the load side;
- make the equipment safe in accordance with current laws and standards;
Check the state of cleanliness of the equipment (the circuit breaking-part), taking action to remove any dust or traces of excess oil or
grease with the aid of a clean dry cloth, using spirits or a mild detergent where necessary.
Check for the presence of the labels indicating the technical characteristics of the device.
These labels must be cleaned with a clean dry cloth.
Remove any traces of dust, mould, condensation or rust inside the fixed part of the device.
Check for any signs of factors such as overheating or cracks that might interfere with the efficient insulation of the circuit breaker.
Make sure that the isolating contacts are intact (for withdrawable circuit breakers). See figure 1.
These contacts should be silver in color, with no traces of erosion or smoke.
Make sure there are no foreign objects inside the circuit breaker compartment.
Check the tightness of the circuit breaker fixing screws, using the torque specified in the installation instructions.
Power connections between the circuit breaker and the switchboard
Remove any dust or dirt depositing on the insulating parts with
the aid of a brush and clean cloths, using a mild detergent if
necessary.
Make sure there are no signs of localized overheating on the
terminals.
This problem can be identified from any change in the coloring
of the parts coming into contact; the parts in contact are usually
silver in color.
Check the tightness of the bolts, using the torque specified in
the installation instructions and catalogues.
Auxiliary circuits
Check the proper connection of the cables and fasteners.
For the procedures for dismantling and reinstalling the
escutcheon plate, refer to the circuit breaker installation
instructions, which are also available on the website
http:\\bol.it.abb.com
Accessories
Make sure the accessories are firmly attached to the circuit
breaker. Consult ABB SACE fo the list of accessories available for
Tmax XT7.
XT 7 M mechanical control
Lubricate the shafts and the opening and closing latches with
grease type MOBILGREASE 28 (EXXON MOBIL) (Fig. 2).
Fig. 1
Fig. 2
Servicing procedures