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OPERATION AND MAINTENANCE MANUAL
MAC-HS MOTORS
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):
Shaft
height
Vibration
(mm)
grade
Mounting
Free
suspension
A
Rigid mount
Free
suspension
B
Rigid mount
When no grade is specified, machines complying with this standard shall be grade "A".
CODE: CTT32 EDITION: 04 RELEASE: SEPTEMBER 2020
Subject to technical changes without prior notice
56 ≤ H ≤ 132
Displacement
Vel.
Accel.
µm
mm/s
m/s
2
25
1.6
2.5
21
1.3
2
11
0.7
1.1
Table 8: Limits of maximum vibration magnitude
132 ˂ H ≤ 280
Displacement
Vel.
Accel.
µm
mm/s
m/s
35
2.2
3.5
29
1.8
2.8
18
1.1
1.7
14
0.9
1.4
PAGE: 18
H ˃ 280
Displacement
Vel.
Accel.
µm
mm/s
2
45
2.8
37
2.3
29
1.8
24
1.5
m/s
2
4.4
3.6
2.8
2.4
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