en
Installation and electrical connection
26
WILO SE 2020-10
Checking the radial alignment
Fig. 23:
Checking the radial alignment with a
comparator
ƒ
Firmly clamp a dial gauge to one of the couplings or to the shaft. The piston of the
dial gauge must lie against the crown of the other half-coupling.
ƒ
Set the dial gauge to zero.
ƒ
Turn the coupling and write down the measuring result after every quarter turn.
ƒ
Alternatively, the radial coupling alignment can also be checked with a ruler.
Fig. 24:
Checking the radial alignment with a
ruler
NOTICE
The radial deviation of the two coupling halves must not exceed the maximum val-
ues found in table “Maximum permissible shaft displacement ΔS
perm.
and ΔKr
perm.
”.
This requirement applies to every operating status – including operating temper-
ature and inlet pressure.
6.7.2
Alignment of the pump unit
Any deviations in the measuring results indicate a misalignment. In this case, the unit
must be realigned to the motor.
ƒ
Loosen the hexagon head screws and the counter nuts on the motor.
ƒ
Place shims under the motor feet until the height difference is compensated.
ƒ
Pay attention to the axial alignment of the coupling.
ƒ
Tighten the hexagon head screws again.
ƒ
Finally, check the function of the coupling and shaft. The coupling and shaft must be
easy to turn by hand.
ƒ
After correct alignment, mount the coupling guard.
The tightening torques for the pump and motor on the base frame are listed in the table
“Tightening torques for pump and motor”.
Screw:
M6
M8
M10
M12
M16
M20
M24
Tightening torque
[Nm]
10
25
35
60
100
170
350
Table 11:
Tightening torques for pump and motor
