M3401-02en Edition 09/2022 43
Servicing
8
8.1 Maintenance intervals8.1 Maintenance intervals
DANGER
Danger due to bursting of the coupling
The coupling can burst if the maintenance intervals are not adhered to. There is a risk of
fatal injury from flying fragments. Bursting of the coupling can lead to an explosion in po-
tentially explosive atmospheres.
• Please observe all the stipulations concerning maintenance of the coupling in this sec-
tion.
DANGER
Danger due to bursting of the coupling
The coupling can burst if the maximum permitted torsional backlash is exceeded. There is
a risk of fatal injury from flying fragments. Bursting of the coupling can lead to an explosion
in potentially explosive atmospheres.
• Note also the actual wear of the elastomer components.
WARNING
Physical injury
Injury from rotating parts.
• Only carry out work on the coupling when it is not moving.
• Secure the drive unit against being operated accidentally.
• Attach a notice to the switch stating clearly that work is being carried out on the coup-
ling.
• Before starting any work, make sure that the unit is free from loads.
Check the torsional backlash between the coupling parts at the specified maintenance inter-
vals. The maximum permissible torsional backlash for the various coupling sizes can be
found in section Maximum permissible torsional backlash.
Model Initial maintenance Follow-up maintenance
BWN 3 months after commissioning Every 12months
BWT
BNT
Table8-1: Maintenance intervals
Shorter maintenance intervals
If necessary, set shorter maintenance intervals depending on actual wear.
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