OPERATION AND MAINTENANCE MANUAL
MAC-HS MOTORS
PAGE: 18
CODE: CTT32 EDITION: 04 RELEASE: SEPTEMBER 2020
Subject to technical changes without prior notice
3.3.5
Vibration grade
The EN 60034-14 international standard specifies the factory acceptance vibration test procedures and vibration limits for certain
electrical machines under specified conditions, when uncoupled from any load or prime mover.
The standard defines two vibration grades: Grade ‘A’ (machines with no special vibration requirements); and Grade ‘B’ (machines
with special vibration requirements).
The table below shows the limits of maximum vibration magnitude in displacement, velocity and acceleration (RMS) for shaft
height (H):
Vibration
grade
Shaft
height
(mm)
56 ≤ H ≤ 132
132
˂
H ≤ 280
H
˃
280
Mounting
Displacement
µm
Vel.
mm/s
Accel.
m/s
2
Displacement
µm
Vel.
mm/s
Accel.
m/s
2
Displacement
µm
Vel.
mm/s
Accel.
m/s
2
A
Free
suspension
25
1.6
2.5
35
2.2
3.5
45
2.8
4.4
Rigid mount
21
1.3
2
29
1.8
2.8
37
2.3
3.6
B
Free
suspension
11
0.7
1.1
18
1.1
1.7
29
1.8
2.8
Rigid mount
14
0.9
1.4
24
1.5
2.4
Table 8: Limits of maximum vibration magnitude
When no grade is specified, machines complying with this standard shall be grade “A”.
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