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9.2.6
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 has been reached. Alternatively,
– In the case of rolling bearings without a regreasing system, it is ensured that the nominal
– For machines that are subject to radial or axial forces, the rolling bearing service life at the
– The nominal rolling bearing service life of machines that are not subject to any forces is
• For rolling bearings with external oil supply, monitor that lubrication is maintained.
9.2.7
Bolt grade
Check that all the screws 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 and, in the case of blind holes, these must be of identical length.
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 11/2023, A5E52779956A
you can verify they are free of mechanical damage as part of an inspection.
service life will only be achieved clearly after achievement of the service life of the grease
in the bearings.
full, specified load is at least 20 000 when operated on 50 Hz line supplies.
at least 40 000 hours when operated on 50 Hz line supplies.
Shaft height
71 ... 355
9.2 Inspection and maintenance
Bolt grade for ambient temperature T
≥ -40 °C ... ≤ 60 °C
Standard
8.8
Maintenance
u
≥ -55 °C ... ≤ 60 °C
Stainless steel bolts
A2-70
A2-80
A4-70
A4-80
119
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