11239449 Installation, operation and maintenance manual – Squirrel cage motor – W Line - Horizontal and vertical l 31
Half of the maximum difference among the dial gauge
measurements in a complete rotation represents the
maximum eccentricity found.
The misalignment in a complete shaft rotation, with rigid
or semiflexible coupling, cannot exceed 0.03 mm.
When flexible couplings are used, greater values than
those indicated above are acceptable, provided that they
do not exceed the value allowed by the coupling
manufacturer.
It is recommended to keep a safety margin for these
values.
Figure 4.11: Angular alignment
Figure 4.11 shows the angular misalignment and a
practical form to measure it.
The measurement is done in four points 90° away from
each other, with the two half-couplings rotating together
in order to eliminate effects of support surface
irregularities on the dial gauge tip. Choosing the upper
vertical point as 0°, half of the difference between the dial
gauge measurements at the 0° and 180° points
represents the vertical misalignment. In case of deviation,
it must be corrected by adding or removing alignment
shims.
Half the difference between the dial gauge measurements
at the 90° and 270° points represents the horizontal
misalignment, which must be properly corrected by
displacing the motor in the lateral/angular direction.
Half of the maximum difference among the dial gauge
measurements in a complete rotation represents the
maximum angular misalignment found.
The misalignment in a complete shaft rotation, with rigid
or semiflexible coupling, cannot exceed 0.03 mm.
When flexible couplings are used, greater values than
those indicated above are acceptable, provided that they
do not exceed the value allowed by the coupling
manufacturer.
It is recommended to keep a safety margin for these
values.
In the alignment/leveling, the influence of the
temperature on the motor and the driven machine must
be taken into account. Different expansions of the parts
may change the alignment/leveling conditions during
operation.
4.8.7
Doweling
After aligning the set and having assured a perfect
alignment
(both, hot and cold)
, the motor must be
doweled to the anchor plate or to the base, as shown in
Figure 4.12.
Figure 4.12: Dowel pin set
Figure 4.12 legend:
1.
Dowel pin (optional supply)
2.
Nut (optional supply)
3.
Washer (optional supply)
NOTE
For the doweling, the motor has a pre-hole
with Ø9 mm, which must be first expanded
to Ø11.5 mm, and then reamed to Ø12 mm
with a taper of 1:50.
4.8.8
Couplings
Only proper couplings, which convey only torque without
generating transversal forces, must be used.
For both flexible and rigid couplings, the shaft centers of
the coupled machines must be in a single line.
Flexible couplings mitigate the effects of residual
misalignments and prevent transmission of vibration
between the coupled machines, which does not occur
when rigid couplings are used.
The coupling must be mounted or removed with the aid
of proper devices and never by means of rudimentary
tools, such as hammers, sledgehammers, etc.
ATTENTION
Dowel pins, nuts, washers and leveling shims
may be supplied with the motor, when
requested in the purchase order.
NOTES
The user is responsible for the motor
installation (unless otherwise specified by
commercial agreement).
WEG is not liable for damages to the motor,
associated equipment and installation
occurred because of:
Transmission of excessive vibration;
Poor installations;
Faulty alignment;
Improper storage conditions;
Noncompliance with the instructions
before start-up;
Incorrect electrical connections.
Horizontal Mounting
Vertical Mounting
Axial measurement
Angular misalignment
