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Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
Rolling bearings maintenance and checking
time setting following the given instruction. In particular
emptying time should be halved for temperature below
-10 °C (+14 °F) and doubled for temperatures above
+40 °C (+104 °F)
.
Automatic lubricators can be temporarily de-activated
(as for out-of-service machines) by setting the
lubricator time set to 0.
Nota! Effective emptying time must not exceed 12
months
Nota! Maximum storage life lasts for 2 years from the
production
Recommended storage temperature is 20 °C (+70 °F).
Parts subject to wear
In spite of correct maintenance, the bearings and any
sliding seals are subject to a certain amount of wear
and therefore require periodical replacement.
The descriptions that follow give some information to
enable timely replacement of worn parts, with
reference to the general condition and the periodical
checks on the bearings according also to the
temperatures and the vibrations.
In any case, it is recommended to replace parts subject
to wear whenever the machine is completely
overhauled.
Always keep components that are subject to wear in
stock.
The types of bearings are indicated on the
maintenance instruction plates mounted on the
machine.
Checking the bearing seals
The bearing seals are graphically described on the
section drawing of the machine, and in the detailed
data in the "Dismantling and Assembly" chapter. Check
Figure 1. Automatic lubricators
date
printed
on
the
that no lubricant outflows from the seals on the shaft,
and if necessary remove any dirt deposited.
Remove any signs of rust using a fine oil stone. If it is
not possible to paint, spread anti-corrosion grease on
the bare surfaces.
Monitoring and control of rolling bearings on
horizontal and vertical machines
Temperature monitoring
Various instruments can be fitted to monitor the
bearing temperature. However, if no instrument is
fitted. The temperature can be measured using
portable instruments. If an anomalous temperature is
found, that is higher than normal, check with a
precision thermometer. The temperature detector
supplied with the machine, or fitted at a later date is to
measure the temperatures of the bearing outer ring. To
set the protection controlled by the temperature
detector (or according to decisions made based on the
manual temperature measurement) on horizontal and
vertical machines with rolling bearings lubricated with
oil or grease, see the relevant document.
In any case an over temperature limit of 50°C is
recommended, in relation to the actual environment
temperature value. The temperature is to be measured
periodically. An increase in the bearings temperature
could indicate the start or the development of damage
caused by lack of lubricant, metal detachment or
component wear, entry of foreign matter, cage
breakage or other similar causes.
The operating conditions of a bearing cannot be
assessed just by the temperature level, but above all
according to its behavior over time. If thermometers are
installed, the trend of the temperature can be
monitored making notes and recording the various
values. If the temperature of the bearings increases in
lubricator.
relation to values of previous readings, try to find the
cause with the machine stationary.
Operating quality monitoring (measurement of
bearing housings vibration)
Set any vibration sensors supplied according to the
values given below, or use these values to assess the
vibration
measurements
instruments. The vibration limit values that trigger an
alarm have been defined on the basis of the indications
contained in ISO Standard 10816. This instruction is
basically valid also for NEMA, API and other similar
standards.
Sheet No.
3AAM101040 E
Rev. B
01.2023
Page 2 of 11
made
with
portable
Issued by: MOLM
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