Maintenance; General Inspection - ABB ACS800 Serie Manuel D'installation

ABB recommends using all the suitable protective
features provided by the converter to improve the safety
of the application. Converters usually provide features
such as (names and availability of features depend on
manufacturer and model of the converter):
– Minimum speed
– Maximum speed
– Acceleration and deceleration times
– Maximum current
– Maximum Torque
– Stall protection
WARNING
These features are only additional and do not
replace the safety functions required by the stand-
ards.
ABB/Low Voltage Motors/ Ex manual 01-2007
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 person-
nel 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.

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 condi-
tions. This can initially be determined experimentally
and must then be strictly adhered to.
2. Keep the motor clean and ensure free ventilation
airfl ow. If the motor is used in a dusty environment,
the ventilation system must be regularly checked and
cleaned. For DIP/Ex tD motors, respect the environ-
ment specifi cations 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
mentioned 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 fi tted. The shaft seals
have to be replaced with seals of the same quality and
characteristics as the originals when changing bearings.
For fl ameproof 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 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.
15 – EN