Maintenance; General Inspection; Standby Motors; Lubrication - ABB M2A Manual De Instalación E Usuario

6.

Maintenance

WARNING
Voltage may be connected at standstill inside the
terminal box for heating elements or direct winding
heating.
WARNING
Standards relating to repair and maintenance of
electrical apparatus in hazardous areas must be
taken into consideration. Only competent personnel
acquainted with these standards should handle this
type of apparatus.
Depending on the nature of the work in question, dis-
connect and lock out before working on motor or
driven equipment. Ensure no explosive gas or dust is
present while work is in progress.

6.1 General inspection

1. Inspect the motor at regular intervals. The frequency of
checks depends on, for example, the humidity level of
the ambient air and on the local weather conditions.
This can initially be determined experimentally and must
then be strictly adhered to.
2. Keep the motor clean and ensure free ventilation airflow.
If the motor is used in a dusty environment, the ventila-
tion system must be regularly checked and cleaned. For
DIP/Ex tD motors, respect the environment specifica-
tions stated in standard EN 50281-1-2./EN 61241-14
3. Check the condition of shaft seals (e.g. V-ring or radial
seal) and replace if necessary.
For DIP/Ex tD motors, the shaft seals should be
changed after 8000 hours of use or a maximum of two
years depending of environmental conditions as men-
tioned above (1). Note: If the DIP/Ex tD motor is
equipped with dust tight bearings of the 2RS type, it is
enough to change seals every second year.
4. Check the condition of connections and mounting and
assembly bolts.
5. Check the bearing condition by listening for any unusual
noise, vibration measurement, bearing temperature,
inspection of spent grease or SPM bearing monitoring.
Pay special attention to bearings when their calculated
rated life time is coming to an end.
When signs of wear are noticed, dismantle the motor,
check the parts and replace if necessary. When bea-rings
are changed, replacement bearings must be of the same
type as those originally fitted. The shaft seals have to be
replaced with seals of the same quality and characteristics
as the originals when changing bearings.
For flameproof motors, periodically turn the knurled head
of the drain plug, if equipped, in order to prevent jamming.
This operation must be done when the motor is at stand-
still. The frequency of checks depends on the humidity
level of the ambient air, and on the local weather condi-
tions. This can initially be determined experimentally and
must then be strictly adhered to.
In the case of the IP 55 motor and when the motor has
been delivered with a plug closed, it is advisable to
periodically open the drain plugs in order to ensure that
the way out for condensation is not blocked and allows
condensation to escape from the motor. This operation
must be done when the motor is at a standstill and has
been made safe to work on.

6.1.1 Standby motors

If the motor is in standby for a longer period of time on a
ship or in other vibrating environment the following meas-
ures have to be taken:
1. The shaft must be rotated regularly every 2 weeks (to
be reported) by means of start up of the system. In case
a start up is not possible, due to any reason, at least
the shaft has to be turned by hand in order to achieve a
different position once a week. Vibrations caused by
other vessel's equipment will cause bearing pitting
which should be minimized by regular operation / hand
turning.
2. The bearing must be greased while rotating the shaft
every year (to be reported). If the motor has been
provided with roller bearing at the driven end the
transport lock to be removed before rotating the shaft.
The transport locking must be remounted in case of
transportation.
3. All vibrations must be avoided to prevent a bearing from
failuring. All instructions in the motor instruction manual
for commissioning and maintenance have to be fol-
lowed additionally. The warranty will not cover the
winding and bearing damages if these instructions have
not been followed.

6.2 Lubrication

WARNING
Beware of all rotating parts.
WARNING
Grease can cause skin irritation and eye inflamma-
tion. Follow all safety precautions specified by the
manufacturer of the grease.
Bearing types are specified in the respective product
catalogs and on the rating plate of all motors except
smaller frame sizes.
Reliability is a vital issue for bearing lubrication intervals.
ABB uses the L1-principle (i.e. that 99% of the motors are
certain to make the life time) for lubrication.
Low voltage Ex motor manual 01-2007 | ABB Motors and Generators EN – 15