Three-phase squirrel cage induction motors in flameproof enclosure type ASA and E2-ASA
frame size 63 – 355
WARNING !
During dismounting or mounting operations special care must
be taken to avoid the scratching or damaging the surfaces forming
flameproof joints.
Repair and overhaul of the flameproof gaps are only allowed
according constructive information given by the original
manufacturer. A repair according to the values given in Table 1 or
Table 2 of EN 60079-1 is not permitted.
9. Maintenance rules
WARNING ! Before starting any maintenance work, make sure that the
motor and supplementary and auxiliary circuits, especially anti-
condensation heaters have been isolated from the supply.
Some parts of the motor can reach temperatures above 50
0
C. Physical
contact with them could result in burn injuries. Check their
temperature before touching them.
Avoid doing maintenance works if explosive gases or combustible
dusts are present !
WARNING !
In order to avoid the risk of hazards caused by electrostatic
charges, clean the motor only with a wet rag or by non-frictional means.
Operating situations and parameters can vary widely. Maintenance
intervals should be scheduled to suit the local operating conditions
(humidity, dust, load, starting frequency a.s.o.). The frequency of checks
can initially be determined experimentally and must then be strictly
observed. For this reason, only general maintenance intervals can be given
here.
Action Operating
hours
Intervals
Initial
inspection
After 500 operating hours
After 6 months
at the latest
Relubrication
See the motor rating plate or
Table 4
Cleaning
Depending on the dust content
of the environment
Main
inspection
Approximately every 8000
operating hours
After 2 years at
the latest
Care must be given to bearing maintenance, to monitoring their heating
and noise level
