Maintenance; General; Maintenance Intervals - ABB MNS R Installation Manual

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

DUTY CONDITIONS
Normal
Installation in dusty or polluted
environments
Circuit breaker tripping for short-circuit
20
1TTS900001M0902
MAINTENANCE
Perform the operations described in
the program
• Perform the operations described
in the maintenance program
• Check the operation of each
apparatus, referring to the related
instruction manuals
• 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
INTERVALS
At least once a year
At least every 6 months
Before putting back into
service