Maintenance; General Inspection; Standby Motors; Lubrication - ABB M3JM Betriebsanleitung

7. Maintenance

WARNING
Voltage may be connected at standstill inside the
terminal box for heating elements or direct winding
heating.
WARNING
Standards IEC/EN 60079-17 and -19 relating to
repair and maintenance of electrical apparatus in
explosive atmospheres 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,
disconnect and lock out before working on motor or
driven equipment. Ensure no explosive gas or dust is
present while work is in progress.
IEC/EN 60079-17 is not applicable for M3JM and
M3KM motors.

7.1 General inspection

1. For inspection and maintenance, use standards IEC/EN
60079-17 (especially tables 1-4) as a guideline.
2. 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.
3. 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.
4. Check the condition of shaft seals (e.g. V-ring or radial
seal) and replace if necessary.
5. For Ex t motors, carry out a detailed inspection accord-
ing to IEC/EN 60079-17 table 4 with a recommended
interval of 2 years or 8,000 h.
6. Check the condition of the connections, and mounting
and assembly bolts.
7. 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 the bearings.
For flameproof motors, periodically open the drain plug, if
equipped, by turning it counterclockwise, tap it to check
free operation and close it by pressing and screwing it
clockwise. This operation must be done when the motor is
at standstill. The frequency of checks depends on 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.
In the case of the IP 55 motor and when the motor has
been delivered with a plug closed, it is advisable to peri-
odically 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 meas-
ures have to be taken:
1. The shaft must be rotated regularly every 2 weeks (to be
reported) by means of starting of the system. In case a
startup 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
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 pro-
vided 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 transpor-
tation.
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 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.
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
For duties with higher ambient temperatures, please
contact ABB. The informative formula to change the L
values roughly to L values: L
10
3GZF500730-47 rev E 06-2015 | ABB Motors and Generators ML/EN – 17
.
1
1
= 2.7 x L .
10 1