3-phase TEFV induction motors ATEX GAS - Zones 1 & 2

C5.1 - LUBRICATION OF
BEARINGS
C5.1.1 - Permanently greased
bearings
For motors of frame size ≤ 132 mm, the
type and size of the bearings make for long
grease life and therefore lubrication for the
lifetime of the machine.
The grease life L according to speed of
10h
rotation and ambient temperature is shown
on the chart opposite.
C5.1.2 - Bearings without grease
nipples only for LSE and LSN
LSE and LSN motors of frame size 160 to
200 are supplied as standard without grease
nipples but with permanently greased
bearings.
Lubricant lifetime (L10h) under normal
operating conditions is given in the table
below for a machine with horizontal shaft
operating at 50 Hz and 60 Hz in ambient
temperatures of 25°C or less.
C5.1.3 - Bearings with grease
nipples
FLSD and FLSN motors of frame size ≥ 160
mm and also LSE/LSN motors size ≥ 225
mm are fitted with grease nipples. The table
in section 5.1.3.1 (on the next page)
indicates the type of ball bearing, the quantity
of grease and the regreasing intervals
according to the type of motor, for an ambient
temperature of 25°C.
For vertical shaft machines used in an
ambient temperature of 25°C, the regreasing
intervals will be approximately 80% of the
values stated.
3-phase TEFV induction motors
ATEX GAS - Zones 1 & 2
Construction
C5 - Bearings and lubrication
t Grease life L10h in 000’s of hours, for frame sizes ≤ 132
t Lubricant lifetime
Frame size
T amb (°C)
60
50
40
30
20
10
0
Speed
N = 750 min -1
N = 1000 min -1
N = 1500 min -1
N = 3000 min -1
5 10 15 20 25
Life L10h in 000’s of hours
3600 3000 1800 1500
160 ≥ 40,000 ≥ 40,000 ≥ 40,000 ≥ 40,000
180 ≥ 40,000 ≥ 40,000 ≥ 40,000 ≥ 40,000
200 16,000 24,000 32,000 ≥ 40,000
Note: On request, motors of frame size 90 to 200 mm can be fitted with grease nipples, and
motors of frame size 225 and 250 can be supplied without grease nipples.
Motors operating in an ambient temperature
of 40°C need more frequent lubrication. The
regreasing intervals will be around 50% of
the values stated (in all cases, comply with
the requirements on the motor nameplates).
Grease references: see instructions on
nameplate.
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The table on the next page is valid
for LS motors lubricated with ESSO
UNIREX N3 grease, which is used as
standard, and also KLUBER BQ72-72
grease for FLSD and FLSN 315 ST/M/L
and 355 L, 2-pole versions only.
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