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Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
Control list 5 – Mechanical installation
Customer
Machine type
Machine serial n°
Radial misalignment
a
, b
, c
and d
are readings from the dial indicator "R" at the points a = top, b = bottom, c = right, d = left (4 turns, each of 90° angle).
1
1
1
1
The readings are entered in the formula to obtain the values of radial misalignment (table 1).
Table 1
Measuring
points
Vertical
Top
Bottom
Difference
Vertical
misalignment
+ Left-hand coupling higher than the right-hand one
- Left-hand coupling lower than the right-hand one
Horizontal
Right
Left
Difference
Horizontal
misalignment
+ Left-hand coupling displaced to right of the right-hand one
- Left-hand coupling displaced to left of the right-hand one
Check for
measuring error
Axial gap and misalignment
The axial gap is determined by taking readings from the two dial indicators AI and AII, whereby the first reading from the top indicator AI
is designated by e
shown in table 2 ; axial displacement (in the example 0.2 mm) during the measurement does not affect the results. Use a feeler gauge
in case the gap is too small to use a dial gauge.
Table 2
Measuring points
Vertical gap
Top
Bottom
Gap
+ The gap is greater at the top
- The gap is greater at the bottom
Horizontal gap
Left
Right
Gap
+ The gap is greater at the left
- The gap is greater at the right
For record files
To
Issued by
1st
2nd
measurement
measurement
a
a
1
2
b
b
1
2
a
-b
a
-b
1
1
2
2
a
b
a
b
1
1
2
2
2
2
c
c
1
2
d
d
1
2
c
-d
c
-d
1
1
2
2
c
d
c
d
2
2
1
1
2
2
a
b
a
b
1
1
2
2
1
c
d
c
d
1
1
2
2
and that from the bottom indicator AII by h
1
Dial AI
Dial AII
e 1
g 1
f 1
h 1
(
f
e
)
(
g
h
)
1
1
1
1
2
i 1
l 1
k 1
m 1
(
k
i
)
(
l
m
)
1
1
1
1
2
From
Example – measures in
hundredth of mm
25
28
31
28
-6
0
-3
0
Left-hand coupling
raised by 0,03 mm.
38
28
18
28
20
0
10
0
Left-hand coupling
moved to left by 0,1 mm.
25 + 31
28 + 28
1
38 18
28 + 28
. The values for vertical and horizontal gaps can be determined as
1
Example – measures in
hundredth of mm
50
42
62
50
(
62
50
)
(
42
50
)
2
The gap is greater by
0,1 mm at the top.
40
36
48
40
(
48
40
)
(
36
40
)
2
The gap is greater by
0,06 mm at the left.
Date
Reg. n°
Sheet No.
3AAM101028 E
Rev. B
01.2023
Page 6 di 13
top
Direction
of view
Right-hand
Left-hand
coupling
coupling
bottom
right
Direction
of view
Right-hand
Left-hand
coupling
coupling
bottom
left
Schematic for table 1
Right
top
Direction
of view
Right-hand
Left-hand
coupling
coupling
Left
bottom
Schematic for table 2
Page
Continues on page
Issued by: MOLM
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