Aligning - Siemens 1LA8 Series Operating Instructions Manual

Quiet running
Stable foundations or mounting conditions, exact
alignment of the motors and a well-balanced
transmission element are essential for quiet vibration-
free running. If necessary, shims should be inserted
under the motor feet to prevent strain.
Caution
When routing cables or other parts or components
close to or next to the motor frame, it should be
taken into account that the motor frame could be
at a high temperature during operation.
Take careful note of the technical data specified in the
motor documentation and on the plates on the motor
frame! The following conditions must also be
observed:
Shipping brace
If any shipping braces are in place, remove them
before installation.
Cooling
The cooling air must be able to be drawn-in and
discharged unimpeded; ensure that warm discharged
air is not drawn back in at the air intake. On the vertical
motor design with air intake from above, the air inlets
must be protected against the ingress of foreign bodies
and water, preferably by using a protective Canopy.
Balancing quality
The rotors are dynamically balanced. For shaft ends
with keys, a half key is inserted into the motor shaft for
maintaining balancing quality.
Please make sure that the power take-off element is
correctly balanced e.g. half-coupling, pulley, etc.
Power take-off element may only be fitted or removed
using suitable equipment.
Balancing, transmission elements
A suitable device should always be used for fitting and
removing the transmission elements (coupling halves,
pulleys, pinions).
As standard, the rotors are dynamically balanced with
the half key inserted.
When fitting the transmission element, keep the type
of balance in mind! Balance with half key.
Warning
The usual measures should be taken to guard
transmission elements from touch. If a motor is
started up without transmission element
attached, the key should be secured to prevent
it being thrown out.
Due attention should be given to the measures
necessary to prevent accidental touching of
rotating parts (couplings, pulleys, etc.).
Caution
The keys are only secured against falling-out
during transport. If the motor has two shaft
ends, and a power take-off element is only fitted
to one end, steps must be taken to prevent the
key at the other end from being slung out.
Noise emission
When assessing the noise that is emitted at a
workplace (if any), it should be taken into account that
the A-weighted sound pressure level, (measured in
accordance with IS: 12065: "Permissible limits of noise
level for rotating electrical machines"), may be higher
when the three-phase AC motors are operated with
the rated output.
Water drain holes
In the bearing end shields on the drive end and non-
drive end, water drain holes are situated in the foot
area and opposite the regreasing devices. They are
sealed with plastic plugs. If there is a risk of
condensation forming in the motor (e.g. due to severe
fluctuations in ambient temperature or direct
sunlight), it may be useful to remove the plugs located
at the bottom after installation.
Note
Nominally the degree of protection of the motor is
reduced to IP44 by removal of the plug.
Rolling-contact bearings
The permissible values for axial and radial forces are to
be taken from the catalog, or inquiries should be made
as necessary.
Installation surfaces
Make sure that the surfaces for the foundations are
leveled and that the installation surfaces for the motor
are parallel to the surface of the foundations. The
undersides of the feet of the machine must be cleaned
before installation.

3.3 Aligning

Instructions relevant for safety
Detailed specialist know-how is required about the
necessary measures in order to correctly align and
securely mount the equipment, e.g. for
• Preparing the foundation,
• Selecting and mounting the coupling,
• Measuring the concentricity and axial eccentricity
tolerances,
• Axial and horizontal positioning.
If personnel are not familiar with the necessary
measures and working steps, we recommend that the
services of the local SIEMENS service center be used.
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