Siemens SIMOTICS XP 1MB155, Руководство по эксплуатации, Страница: 114 / 152

Maintenance
9.1 Inspection and maintenance
1MB155 / 1MB555
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Operating Instructions, 03/2018, A5E41926185A
9.1.7 Bolt grade
Check that all the bolts for attaching the end shields, bearing covers, gland plates, and
terminal boxes are present and properly tightened. Replace damaged bolts with identical
bolts of a perfect quality.
Frame size Bolt grade for ambient temperature T
u
≥ -40 °C
Standard Stainless steel bolts
71 ... 355 8.8 A4-70
A4-80
9.1.8 Mechanical explosion protection for rolling bearings
All machines marked in accordance with Directive 2014/34/EU ("Explosion Protection
Directive") must be regularly inspected for mechanical damage which 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
● Rolling bearing service life
–
Replace the rolling 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 rolling 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 rolling bearing service life under full specified load is at least 20 000 hours for
machines subject to radial or axial forces.
– The nominal rolling bearing service life of machines which are not subject to any
forces is at least 40 000 hours.
● For rolling bearings with external oil supply, monitor that lubrication is maintained.