Servicing
8
8.1 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 potentially
explosive atmospheres.
● Please observe all the stipulations concerning maintenance of the coupling in this section.
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 coupling.
● 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
intervals. The maximum permissible torsional backlash for the various coupling sizes can be
found in section Maximum permissible torsional backlash (Page 44).
Table 8-1 Maintenance intervals
Type Initial maintenance Follow-up maintenance
A 3 months after commissioning Every 12 months
B
ADS 3 months after commissioning
1)
Every 12 months
1)
BDS
1)
According to the ATEX Directive, need only be inspected if a failure of the flexible elements (12) and
shutdown of the drive as a result of this failure could give rise to a risk of explosion. We recommend
that the torsional backlash is checked regularly.
N-EUPEX / N-EUPEX DS 3100en
Operating Instructions 10/2017 43
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