Maintenance Program - ABB MNS R Installation Manual

5.3

Maintenance Program

1. Circuit breakers connections
(cables or busbars)
2. Earth busbar joints and related
connections
3. Insulating busbar keepers
4. Ventilation grids
5. Circuit breakers
6. Main power feeding busbars,
distribution busbars, connections
between busbars and circuit breakers
Measure the insulation resistance in accordance with the same procedures indicated for the start. Measured
values should not be very different from those detected during the start. If the insulation level is notably less,
carry out voltage tests. It is better to perform the insulation resistance measurement before the voltage tests,
and in case of insulation resistance decrease it is necessary to search the crush point.
GENERAL INSPECTIONS
• Contact surfaces blackening
• Loosened screws
• Copper oxide
• Loosened screws
Dust
• Crack
• Discharge marks
Dust or dirt
See the related installation,
operation and maintenance
instructions
Discharge or smoke marks
INSULATION RESISTANCE INSPECTION
• Clean with cloth and solvent
• Tighten according to the
tightening torque indicated in
Appendix A.
• Remove the oxide by means
of a file or an emery cloth
• Clean with cloth and solvent
Tighten according to tightening
torque
Remove the dust by means of a
vacuum cleaner
Replace the damaged busbar
keepers (address to ABB Sace)
Remove by means of a vacuum
cleaner
Carry out the suggested
maintenance procedures
Clean with solvent. If necessary
replace the damaged part
(address to ABB Sace)
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