ABB MNS R, Installation Manual

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1TTS900001M0902
DUTY CONDITIONS MAINTENANCE INTERVALS
Normal Perform the operations described in
the program At least once a year
Installation in dusty or polluted
environments • Perform the operations described
in the maintenance program
• Check the operation of each
apparatus, referring to the related
instruction manuals
At least every 6 months
Circuit breaker tripping for short-circuit • Perform the circuit breaker
general inspection (see the
related installation, operation and
maintenance instructions)
• Check the condition of the
shorted power cables
• Check the circuit breaker terminal
connection
• Perform the operations described
in the maintenance program
Before putting back into
service
5. Maintenance
5.1 General
Before performing any maintenance operation in the switchboard or in the installed equipment it is
compulsory to:
- Power the compartment off (if possible), otherwise power off only the relevant section (power and
auxiliary circuits)
- Earth the unit involved for work on it.
Only in case of absolute necessity and for switchboards in partially or totally segregated execution, it is
possible to keep in service some parts of the compartment. In any case, do not remove any diaphragm
or panel which require the use of tools, before having checked that in the related compartment area the
voltage has been cut off.
Establish the earth connection.
5.2 Maintenance Intervals