II-158
WSM Minor Change II Service Engineering Section
(10)AI pressure switch
C/N RC411-53681, 25kgf/cm
2
, Normal close type
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(12)
(13)
(14)
(11)
1. Function
When the pressure sensed by the oil pressure
detection circuit for auto idle control has dropped
below 20 kgf/cm
2
, the contact of the AI switch,
shown at left, gets closed. The microcomputer picks
up the resulting ON signal and sends a command to
the AI motor to reach the engine idling speed. The
idling speed approach is preset to be 4 seconds
after the switch has been turned on by the micro-
computer.
When the control lever is moved, on the other hand,
the pressure in the hydraulic pilot circuit rises. At 25
kgf/cm
2
, the hydraulic pressure pushes the dia-
phragm as shown at left, which opens the contact.
The microcomputer picks up the resulting OFF sig-
nal and raises the engine speed up to the accelera-
tor lever rpm setting.
2. Switch specifications
(1) Detection method: Metallic diaphragm
(2) Switching logic: Normally closed (NC)
Continuity resistance 0.2
:
(3) Operating pressure:
2.45 ± 0.3 MPa (25 ± 3 kgf/cm
2
) --> Switch OFF
1.96 ± 0.3 MPa (20 ± 3 kgf/cm
2
) --> Switch ON
(4) Insulation resistance: Over 100 M
: (with
DC500V megger)
(5) Code No.: RC411-53681
1 Terminal block
2 Terminal
3 Movable contact plate
4 Movable contact
5 Fixed contact
6 Shaft
7 O-ring A
8 Guide plate
9 Stopper
10 Flex plate
11 Cap
12 O-ring B
13 Coupling
14 O-ring C
15 Clamp plate
AI pressure SW
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