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Assembly
5.5 Alignment and fastening
5.4.6
Noise emission
Hearing damage when operating three-phase motors
If the permissible sound pressure level is exceeded, hearing damage can occur when
operating three-phase motors at their rated power.
Observe the maximum permissible sound pressure level according to the ISO 1680
standard. The maximum permissible sound pressure level is 70 dB (A).
5.5
Alignment and fastening
Observe the following when aligning and mounting:
● Ensure a flat and uniform contact surface for foot and flange mounting.
● Precisely align the machine when couplings are used.
● Ensure that the mounting surfaces are clean and free of any dirt.
● Remove any anti-corrosion protection using white spirit.
● Avoid installation-related resonances with the rotating frequency and twice the line
frequency.
● Note any unusual noise when the rotor is manually turned.
● Check the direction of rotation with the motor uncoupled.
● Avoid rigid couplings.
● Repair any damage to the paint, this must be done immediately and correctly.
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.
44
CAUTION
Smoke extraction motors
Operating Instructions, 03/2016, 5 610 80000 40 018
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