Motor Bearings; Faults - Trox Technik X-CUBE-Ex Guide D'utilisation

BA-CFD-RLM-ATEX 3.9 – 04/2016
Table 10-2: Vibrations
CAUTION

11. Faults

DANGER!
EN-20/24
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.
Fan with AVM
Motor power
≤ 3,7 kW
> 3,7 kW
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;
experience 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.
If the condition of the fan does not allow modified repair measures it
must be put out of commission and be replaced immediately if
required.
If any faults occur during operation which cannot be repaired by maintenance
personnel please contact the service department at Nicotra Gebhardt GmbH.
Risk of explosion caused by improper operating states!
 Switch the fan off immediately if permissible limits are exceeded and in
the event of irregularities or faults.
Fan without AVM
Vibration Motor power
velocities
9,0 mm/s ≤ 3,7 kW
6,3 mm/s > 3,7 kW
English
Vibration
velocities
5,6 mm/s
4,5 mm/s