English
EN-23/32
10.4.1 Vibration monitoring
The fan has to be frequently checked for vibrations. The max. vibration velocity
values admitted are those which relate to ISO 14694.
Table 10-2:
Size
Vibration velocities
mm/s
Vibration velocity
≤
0315
7,1
≥
0355
4,5
These vibration velocities are to be measured in a radial direction on the bearing
or bearing casing of the motor.
Deposits of dirt and dust on the impeller can cause unbalancing and subsequent
damages. In order to prevent this danger frequent inspections and cleaning
measures have to be carried out depending on the degree of possible deposit.
10.4.2 Motor bearings
The motor bearings are supplied permanently lubricated by the factory; ex-
perience has shown that the grease needs to be changed only after several
years only under normal operating conditions.
In the case of bearing noise please contact Nicotra Gebhardt-Service for a
check and a possible change of defective bearings.
10.4.3 Periods of stand still
During longer periods of standstill the fan must from time to time be put into
operation for a short while. This is to avoid bearing damages due to the
mechanical load and ingress of humidity.
After longer periods of storage, the fan and motor bearings have to be
checked prior to installation.
10.5.
Belt drive
The belt drive has to reply to the requirements of the ATEX guideline and will
maintenance free be after the start-up / running-in phase.
It is nevertheless recommended to check belt tension in regular intervals.
The test force F
p
is indicated at the type plate and the design sheet.
