Maintenance; General Inspection; Standby Motors; Lubrication - ABB MT Série Manuel D'installation, D'exploitation Et De Maintenance

7. Maintenance

WARNING!
Voltage may be connected at standstill inside the
terminal box for heating elements or direct winding
heating.

7.1 General inspection

1. Inspect the motor at regular intervals, at least once a
year. 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 ventilation system must be regularly checked and
cleaned.
3. Check the condition of shaft seals (e.g. V-ring or radial
seal) and replace if necessary.
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 bearings
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.
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.

7.1.1 Standby motors

If the motor is in standby for a longer period of time on
a ship or in other vibrating environment the following
measures have to be taken:
1. The shaft must be rotated regularly every 2 weeks (to
be reported) by means of starting up of the system. In
case a start-up is not possible, for 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.
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ABB Motors and Generators | Low voltage motors manual, 3GZF500730-85 Rev F 02-2015
Standard_Manual_LV_Motors_ML_revF_Book.indb 14
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 must 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
failing. All instructions in the motor instruction manual for
commissioning and maintenance have to be followed.
The warranty will not cover the winding and bearing
damages if these instructions have not been followed.

7.2 Lubrication

WARNING!
Beware of all rotating parts!
WARNING!
Grease can cause skin irritation and eye
inflammation. 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 mainly the L -principle (i.e. that 99 % of the
1
motors are certain to make the life time) for lubrication.
7.2.1 Motors with permanently greased
bearings
Bearings are usually permanently greased bearings of 1Z,
2Z, 2RS or equivalent.
As a guide, adequate lubrication for sizes up to 250 can
be achieved for the following duration, according to L
duties with higher ambient temperatures, please contact
ABB. The informative formula to change the L
roughly to L values: L = 2.0 x L
10 10
. For
1
values
1
.
1
6/2/2015 6:44:25 PM