Flameproof motors | 25
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Installation and examples:
Figure 5-2 - Example 1
Figure 5-3 - Example 2
EXAMPLES OF PREPARATION
Remove all dirt from the foundation blocks in order
to ensure a perfect anchorage between the
foundation blocks and the motor. Fix the foundation
blocks at the motor feet by means of bolts.
Using shims of different thickness (total tickness of
about 2mm) between the motor feet and the
foundation base an accurate vertical alignment can
be obtained.
Inside the feet holes, the fastening bolts must be
covered with a metal sheet or presspan in order to
center the foundation blocks exactly to the feet
holes and perform an accurate alignment
horizontally.
Place shims or leveling bolts under the foundation
blocks in order to obtain a perfect motor leveling
and alignment between the motor and the driven
machine. After introducing the concrete, make an
accurate control of the alignment. Eventually small
corrections can be done by washers or metal plates
or by means of a new adjustment of the fastening
bolt clearences. Tighten now firmly all fastening
bolts.
Make sure that all motor feet surfaces are
supported uniformly without damaging motor
frame. After completing the test, introduce two
tapered pins for correct fastening. For this purpose,
use the pre-dilled holes in the feet.
5.1.3.2 SLIDE RAILS
When drive system is done by pulleys, the motor
should be mounted on slide rails and the lower part
of the belt must be pulling.
The nearest rail to the drive pulley is positioned in
such a way that the adjusting bolt (1) is between
the motor and the driven machine. The other rail
must be positioned with the bolt on the opposite
side (diagonally opposite (2)), as shown in Figure
5-4. The motor is bolted to the rails and set on the
base.
The drive pulley is then aligned in such a way that
its center be in the same level of the driven pulley
center.
Motor and driven machine shafts must be in a
parallel position.
The belt should not be excessively stretched, see
Figure 5-14. After the alignment, rails must be
fixed.
Figure 5-4 - Rail mounting
5.1.3.3 METALLIC BASES
The metallic bases must have a flat surface under
motor feet in order to avoid frame deformation.
Motor should not be removed from their common
metallic bases for alignment; the metallic bases
should be leveled on the actual foundation.
When a metallic base is used to adjust the height
of the motor shaft end with the machine shaft end,
it should be leveled on the concrete base.
After the base has been leveled, foundation studs
tightened, and the coupling checked, the metal
base and the studs are then cemented.
(1)
(2)