Maintenance Intervals - ABB MNS-Up Service Manual

M A I N T E N A N C E I N T E R VA L S
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Maintenance intervals

Please refer to MNS Service Manual 1TGC902040B0201 section 7 and DPA500 manual section 7.
General visual inspection (repetitive tests):
• External inspection
• Completion of the interior
• Switchgear and control gear assemblies (withdrawable or plug-in modules)
Additional inspections:
• – Withdrawable technique
• – Plug-in, technique
• – Direct connection of incoming and outgoing power feeders with circuit breakers, e.g. Emax, ISOMAX or Tmax
Notes on the inspection lists on the following pages:
• The frequency refers to time intervals (monthly, annually, etc.), service hours, starting frequency, etc.
The following abbreviations are used to denote the frequency:
- m: monthly
- a: annually
- n: insertion cycles of modules
- x: test in the event of a fault (e.g. after a short-circuit)
• "Installation category" column
A distinction is made between the following installation categories, because the frequency of maintenance or inspection
depends on the operating conditions:
- Installation category A: Normal operation
- Installation category B: Heavy-duty operation, e.g. cement factory
- Installation category C: Short circuit (fault)
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