ABB
66
ABB/ BU Machines / HV Induction motors IEC catalogue / Engineered motors EN 12-2007
2
Vibrations
Standard design
The standard motors manufactured according to IEC-
standard satisfy the Grade A vibration limits found in
IEC 60034-14. The table below shows the maximum
accepted values.
Poles
Speed [rpm]
Bearing housing
vibration
Relative shaft
vibration
Combined runout
2
1800 < n
d
3600
2.3 mm/s rms
65 μm p-p
16 μm p-p
t
4
n
d
1800
2.3 mm/s rms
90 μm p-p
23 μm p-p
Table below: Standard design unfiltered vibration limits for IEC motors.
Bearing rating life
The bearing rates for all vertical motors with standard
bearings have a rated life time L
10h
in excess of
100000 h. The life times are calculated in accordance
with ISO R 281-1.
The basic rated life L
10h
is the number of hours at rated
bearing load and speed that 90% of a group of identical
bearings will complete or exceed before the first
evidence of failure.
Additional axial force from the driven equipment is not
allowed.
Lubrication intervals
The motors are equipped with greasing nipple(s) in
both ends for lubricating the bearings. The amount of
grease and the interval of greasing are stamped on the
relubrication plate. The values are also available in the
table on page 63.