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50
8. Daily Inspection and Maintenance
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FB-3E, FB-4E (Indoor Type)
Code
Part Name
1
Stationary core
2
Brake release
3
Manual release prevention
spacer
4
Brake release bolt
5
Spacer
6
Gap adjusting shims
7
Attachment bolt
8
Brake lining
9
Leaf spring
10
Boss
11
Shaft-retaining C-ring
12
Cover
13
Shaft-retaining C-ring
14
Fan
15
Fixed plate
16
Armature plate
17
Spring
18
Electromagnetic coil
19
Ball bearings
20
Motor shaft
21
Shock absorber
-
Gap Inspection
(1)
Remove the brake release bolt [4] and the manual release prevention spacer [3].
(2)
Remove the cover [12].
(3)
Insert a gap gauge between the stationary core [1] and the armature plate [16]
and measure the gap. Measure in 3 locations around the circumference.
(4)
Adjustment is required if the gap value is near the limit.
(Gap adjustment shim thickness is approximately 0.45 – 0.55 mm. Adjustment cannot be made at a lower value.)
-
Gap Adjustment
(1)
Remove the brake release bolt [4] and the manual release prevention spacer [3].
(2)
Remove the cover [12].
(3)
Remove the shaft-retaining C-ring [13] and the fan [14].
(4)
Loosen the attachment bolts [7] and remove the spacers [5], gap adjustment shims [6], attachment bolts [7] and fixed plate [15]
as a set. When removing the attachment bolts [7] make certain not to omit the gap adjustment shims [6] or the shock absorber
[21].
(5)
The gap adjustment shims [6] have a thickness of 0.45 – 0.55 mm. Reduce the number of shims according to the wear
conditions, then reassemble the spacers [5], gap adjustment shims [6], attachment bolts [7] and fixed plate [15] as a set.
(6)
Check the gap G, and readjust the shims if there is a large difference between the gap and the required value.
(7)
Turn the power on and off to check brake action.
(8)
Attach the fan [14], shaft-retaining C-ring [13] and cover [12].
(9)
Finally, attach the brake release bolt [4] and the manual release prevention spacer [3].
Gap value G (mm)
Required value
(original value)
Limit value
0.25 – 0.35
0.85
1
2
3
4
5
6
7
8
9
10
11
Ｇ
12
13
14
15
16
17
18
19
20
X
Details for X
21
Figure 8-12
