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Assembly
5.4 Alignment and fastening
5.4.2
Measures for alignment and mounting
The following measures are required in order to compensate any radial offset at the coupling
and to horizontally adjust the electrical machine with respect to the driven load:
• Vertical positioning
For vertical mounting positions, avoid deforming the machines by placing shims under the
mounting feet. Keep the number of shims low; only use a few stacked shims.
• Horizontal positioning
To position the machine horizontally, shift it sideways on the foundation and ensure that
the axial position is maintained (angularity error).
• When positioning the motor, ensure that a uniform axial gap is maintained around the
coupling.
• Smooth running
Preconditions for smooth, vibration-free operation:
– Stable foundation design free of any shock or vibration.
– A precisely aligned coupling.
– A well-balanced drive output element (coupling, belt pulleys, fans, ...)
Maintain the maximum permissible vibration values in operation according to ISO 10816-
3.
Avoid inadmissible vibration caused by imbalance, for example (drive output element),
external vibration or any resonance over the complete speed range.
It may be necessary to completely balance the machine with the drive output element or
the system resonance frequency must be shifted.
• Foot mounting/flange mounting
– Use the specified thread size laid down in EN 50347 when flanging the machine to a
– Mount the machine at all the foot or flanged holes provided. The choice of fixing
– Select the correct screw length for IM B14 flanges.
– Ensure that the screw heads are in full contact with the flange surface. Use additional
5.4.3
Flatness of the supporting surfaces for conventional motors
74
foundation or a machine flange.
elements depends on the foundation and is the plant operator's responsibility. Comply
with the required property classes for screwed connections and materials for fixing
elements.
flat washers (ISO 7093), especially for elongated foot mounting holes.
Shaft height
≤ 132
160
≥ 180
Flatness
[mm]
0.10
0.15
0.20
1MB1.33 Eagle Line shaft heights 71 ... 315
Operating Instructions, 08/2023, A5E52990459A
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