Maintenance; General Inspection; Lubrication; Machines With Permanently Greased Bearings - ABB Low Voltage Motors Manuel D'installation, D'exploitation Et De Maintenance

6. Maintenance

WARNING
Voltage may be connected at standstill inside the
terminal box for heating elements or direct winding
heating.
WARNING
The capacitor in single-phase motors can retain a
charge that appears across the motor terminals,
even when the motor has reached standstill.
WARNING
A motor with frequency converter supply may
energize even if the motor is at standstill.

6.1. 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.
EN-14

6.2 Lubrication

WARNING
Beware of all rotating parts!
WARNING
Grease can cause skin irritation and eye
inflammation. Follow all safety precautions
specified by the manufacturer.
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.
6.2.1 Machines with permanently greased
bearings
Bearings are usually permanently greased bearings of
1Z, 2Z, 2RS or equivalent types.
As a guide, adequate lubrication for sizes up to 250 can
be achieved for the following duration, according to L
Duty hours for permanently greased bearings at ambient
temperatures of 25 and 40° C are:
Lubrication intervals according to L
Duty hours
Frame
size Poles at 25° C
56-63 2-8 40 000
71 2 40 000
71 4-8 40 000
80-90 2 40 000
80-90 4-8 40 000
100-112 2 40 000
100-112 4-8 40 000
132 2 40 000
132 4-8 40 000
160 2 40 000
160 4-8 40 000
180 2 38 000
180 4-8 40 000
200 2 27 000
200 4-8 40 000
225 2 23 000
225 4-8 40 000
250 2 16 000
250 4-8 40 000
Data valid at 50 Hz, for 60 Hz reduce values for 20 %.
ABB/Manual for Low Voltage Motors 01-2009
.
10
principle
10
Duty hours
at 40° C
40 000
40 000
40 000
40 000
40 000
32 000
40 000
27 000
40 000
36 000
40 000
38 000
40 000
27 000
40 000
18 000
40 000
13 000
39 000