ERPN-M USER INSTRUCTIONS ENGLISH 02-08
Page 15 of 37
4.4 Initial alignment
The adjustment of motor and pump must be checked
(if necessary, make a new adjustment) before first
start up of the unit.
Parallel
Angular
Ensure pump and driver are isolated electrically and
the half couplings are disconnected.
Align the motor to the pump, not the pump to the
motor. Alignment of the motor is achieved by using
the adjustment screws.
4.4.1 Permissible misalignment limits at working
temperature
When checking parallel alignment, the total indicator
read-out (TIR) shown is twice the value of the actual
shaft displacement.
The pump is only pre-aligned! Carefully check
or read just alignment before start of the unit.
Take out the spacer of the coupling and check the
alignment of shafts end of pump and driver. The
maximum allowable angular offset should not exceed
0,05 degree, this means the alignment of the shaft
ends should be 0,1 mm (0.004 in.). The maximum
parallel offset should not exceed 0,05 mm
(0.002 in) and the axially offset can be ± 1 mm
(0.04 in.).
For more details refer to the manufacturer’s
instruction manual of coupling.
a)
b)
c)
a) Angular Offset: The median lines of shafts
intersect half-way between the ends of the two
shafts.
a) Parallel Offset: The median lines run parallel. The
maximum allowable parallel offset depends on
the size of coupling and is indicated in the
instruction manual of manufacturer of coupling
b) Axially Offset: Another offset is the displacement
of one or both of the shafts. A typical example is
thermal expansion.
How the alignment of the coupling should be done
you can see on the sketches and explanations below!
a)
b)
c)
a) Fix the dial gauge on the driven shaft and check
the concentricity by turning of both hubs; correct it if
necessary.
b) Fix the dial gauge on one of the hubs and check
the uniformity of the distance by turning of both
hubs.; correct it if necessary.
c) Fix the dial gauge on the driving shaft and check
the concentricity by turning of both hubs; correct it if
necessary.
If the pump is handling hot liquid, the alignment must
be rechecked in warm condition of the unit.
The alignment of the unit shall be checked again after
200 service hours.
