Auto switch
The rotary actuator has a magnet mounted on its piston and an auto switch on the outside of the body
to detect the piston position (table position). Rotary actuators have a short piton stroke, so detection should
be done at the stroke end.
Refer to page 18 for mountable auto switches.
Internal structure and operation principle
In Fig.9, the switch A is turned on. When pressurized from port A, piston B moves to the left and piston
A moves to the right, and the shaft rotates clockwise. At this point, magnet goes out of switch A
’s
operation range to turn off switch A. Then, piston A moves right, and the magnet goes into switch B
’s
operation range to turn on switch B.
Mounting of auto switch
When tightening the auto switch mounting screw, use a precision screwdriver with a handle of 5 to 6 mm
in diameter.
Table 8 shows the recommended tightening torque.
Use the designated slotted set screw (M2.5×4L) to mount the auto switch.
-29-
A Port
B Port
Set screw
Auto switch
Fig.10
Most sensitive position
Operating lange
Operating lange
Most sensitive position
Piston A
Switch B
Piston B
Switch A
Fig.9
Magnet
Magnet
Port A
Table 8. Recommended tightening torque
Auto switch model
Recommended
tightening torque [N
・
m]
D-M9
□
0.05 to 0.15
D-M9
□
A
(Water resistant)
0.05 to 0.10
D-A9
□
0.10 to 0.20
2020-10-13 10:40
DI987004