Siemens SIMOTICS XP 1MD4, Инструкция по эксплуатации и монтажу, Страница: 80 / 128

9.1.6 Mechanical explosion protection for roller bearings
All machines marked in accordance with directive 94/9/EG must be regularly inspected for
mechanical damage that could constitute a risk of ignition in accordance with IEC / EN
60079‑17 .
● Comply with the following intervals:
– Bearing replacement intervals
– Relubrication intervals
– Grease replacement intervals
– Oil change intervals
● Roller bearing service life
– Replace the roller bearings once the nominal service life is reached. Alternatively, you
can verify they are free of mechanical damage as part of an inspection.
– In the case of roller bearings without a regreasing system, it is ensured that the nominal
service life will only be achieved clearly after achievement of the service life of the grease
in the bearings.
– The roller bearing service life under full specified load is at least 20 000 hours for
machines subject to radial or axial forces.
– The nominal roller bearing service life of machines which are not subject to any forces
is at least 40 000 hours.
● For roller bearings with external oil supply, monitor that lubrication is maintained.
9.1.7 Maintenance
9.1.7.1 Explosion protection for machines with type of protection "Ex d"
For explosion-protected motors with type of protection "flameproof enclosure" according to
IEC / EN 60079–0 and IEC / EN 60079–1, observe the following:
It is not permissible to subsequently machine or paint contact and mating surfaces of the parts
listed below:
● Stator frame
● End shields
● Bearing covers
● Motor shaft
● Gland plate
● Terminal box base
● Terminal box cover
● Gland plates for additional terminal boxes, where present
Maintenance
9.1 Inspection and maintenance
SIMOTICS XP 1MD4/1MD5
80
Operating Instructions 05/2015