Control procedure must be performed at 4 diametri-
cally opposed, equidistant points on the periphery
(fig. 6A)
.
For adjustment, loosen or tighten the screws where
necessary in order to move the position of the sup-
port feet on the baseplate and to add calibrated pla-
tes between the feet and baseplate wherever these
may be required.
Make sure the rotor turns freely when moved by
hand.
The alignment must be rechecked once the unit
attains its operating temperature.
While the foundation is still new and the unit has
not been fully tested under all operating conditions,
verification of alignment must be repeated at regu-
lar intervals and, if necessary, alignment procedure
must be carried out again.
4.2. Pump motor unit with Rex-Viva
coupling
Remove the coupling guard, loosen the screws and
remove the half-couplings.
With a dial indicator or straight edge, check the
coaxial alignment of the hubs fixed at motor shaft
and pump shaft.
Control procedure must be performed at 4 diametri-
cally opposed, equidistant points on the periphery
(fig. 6B).
For adjustment, loosen or tighten the screws where
necessary in order to move the position of the sup-
port feet on the base-plate and add calibrated pla-
tes between the feet and base-plate wherever
these may be required.
Reassemble the half-couplings following this
sequence:
- Insert the two central screws of the first half-cou-
pling.
- Insert and tighten the two central screws of the
second half-coupling at the required torque.
- Tighten the two central screws of the first half-cou-
pling at the required torque.
- Insert the two lateral screws of the first half-cou-
pling.
- Insert and tighten the two lateral screws of the
second half-coupling at the required torque.
- Tighten the two lateral screws of the first half-cou-
pling at the required torque
- Repeat the sequence for the last screws.
Tighten the screws at the torque advised by the
manufacturer on the coupling instructions.
Make sure the rotor turns freely when moved by
hand. The alignment must be rechecked once the
unit attains its operating temperature.
While the foundation is still new and the unit has
not been fully tested under all operating conditions,
verification of alignment must be repeated
at regular intervals and, if necessary, alignment
procedure must be carried
out again.
ATTENTION: poor baseplate installation and
misalignment of units or faulty connection of
pipes will cause vibration and early wear of ela-
stic coupling inserts, bearings, the seal and other
internal parts
(see also
sections 2.1., 3.1., 4.1.
).
4.3. Extra support for bearing housing
In order to reduce problems caused by expansion
or residual external stress in pipes,
N, N4 pumps
may be fitted with a support and anchoring foot
which will help to impede variation of alignment to
an extent that might cause damage.
The recommended dimensions are indicated (in
mm) in
fig. 7
.
During alignment operations, before connection of
pipe, leave support foot screws untightened so as to
avoid stress by pipe strain or shifting of axis height.
The support foot must be placed on the base surfa-
ce and brought into contact with the support itself
only after completion of alignment procedure, which
must be re-checked after tightening the screws
Fig. 6A Alignment of coupling.
Fig. 7 Optional support foot.
11
Dimensions EN 733
h
s
d
w1
h1
24
100
112÷180
77
4
32
130
180÷250
97
6
42
160
280÷315
132
6
15
25
s
110
w1
160
h
h1
1
5
d
PER VITI M12
R=s
4
.9
3
.0
4
1
15
25
s
110
w1
160
h
h1
1
5
d
FOR BOLTS M12
R=s
4
.9
3
.0
4
1
15
25
s
110
w1
160
h
h1
1
5
d
FÜR SCHRAUBEN M12
R=s
4
.9
3
.0
4
1
straight edge
gage
4.93.036
Sollevamento gruppo
pompa-motore
Lifting the
pump-motor unit
P057/1
riga
straight edge
Fig. 6B Alignment of coupling.
straight edge
