Tadano TT-800XXL1, Service Manual

Page: 140 / 267

H-2 H-2
Boom Length and Angle Detector
2
W305-023 1 E
Boom Length and Angle Detector
[NOTICE]
There is a case that the appearance and so on
differ from the parts for this machine. Although there
is not so much difference in functions and
disassembly procedures, make sure of the serial
number of this machine and the part sales unit
described in the parts catalog before starting
disassembling operations.
1 .Structure and function
1 . The Boom length and angle detector consists of a
recoil spring, cord, reduction gear, potentiometer
(for boom length detection), and boom angle
detector.
2. The cord wound on the drum is unwound and
rewound by the recoil spring after the extension
and retraction of the boom.The resultant drum
rotation is reduced by the reduction gear,which in
turn rotates the shaft of the potentiometer.
3. The electric resistance of the potentiometer shaft
varies proportional to the reduction of the shaft
rotation,and the change in electric resistance is
transmitted to the AML main body to detect the
boom length.
IW305-0230E0 1
28
0.85Y
0.85W
26,47,48,5 1
1 W
2Y
36 1 4 36
46
0.85W
27,47,49,5 1
1 8
30
3 1
20,25
53,54,55
1 2
56,57,58
39
35
7
11
38
20,25
39
1 9
1 W
2Y
2 1
23
1
3 2 24 1 0 34 1 5 8
1 3
43
37
1 3
43
9
1 7
29
22
50
60
1 6
40,44
6,42
4
4 1
32
33
52
5,42
0.85Y
Core wire
Shield wire
Provide a seal with tape and then wind the insulating tape here.
IW305-0230E02
A
B
B
G
R
G
R
W
Cable
(for boom angle detection)
Potentiometer
(for boom length detection)
Connector
D
C
B
E
2
1
3
3 0.5R
1 0.5B
2 0.5W
Potentiometer
(for boom length detection) Resistance : 5000 ± 750 Ω
Electric turning angle : 350°
Mechanical turning angle :
360°, continuous rotation
Potentiometer
(for boom angle detection) Resistance : 1 000±200 Ω
Electric angle : 1 20 ± 1 .5°
Electric Symbol