9.0 mm/s between 8 Hz and 200 Hz
continuously. The amplitude or speed
can be measured on any shell or base
of the alternator, and this limit is the
highest frequency amplitude of
multiple complex vibration waveforms.
Definition in ISO8528-9
ISO8528-9 specifies a broadband
frequency band from 2 Hz to 300 Hz.
The following table is taken from
ISO8528-9. Tab. 7-1 lists the vibration
limits of sets with different capacities
and speeds.
Set Vibr Vib
outp atio rati Vibrati
Motor
speed
ut
capa
citan
n
ampl
itud
on
spe
ed,
on
acceler
ation,
ce, e, m m/s2
KVA mm m/
4-pole
≤
50K
0.8
s
50 31
1500r VA
/min
50Hz
〉50
KVA
0.64
40
25
Frequency band of 2 Hz~300 Hz
Operation Manual of WEICHAI GENSET
Important! Long-term storage in a
vibrating environment leads to forced
vibration of the alternator, and thus
Brinell ball indentation, making the
steel ball deform and dent on the
raceway, resulting in premature
damage.
Important! Grease may be softened in
a very humid climate or environment,
thereby causing corrosion and
premature bearing damage.
Important! The service life of bearings
is directly related to working conditions
and environment.
Important! Excessive vibration of the
engine or poor alignment of the set
causes lateral force to the bearing, thus
reducing its service life. If the vibration
exceeds the specified value in BS5000-
3 or ISO8528-9, The service life of
bearing will be reduced.
79
