SMC Networks MHT2 - Manual (Page 9)

Various auto switch applications are possible through different combinations of auto switch quantities and detecting positions.
2) Detection when Gripping Interior of Workpiece
Detection example
Detection combinations
One auto
switch
Two auto
switches
How to determine
auto switch
installation position
At no pressure or low
pressure, connect the
switch to a power
supply, and follow the
directions.
1. Confirmation of fingers in reset
position
2. Confirmation of workpiece held 3. Confirmation of workpiece released
Position of
fingers
fully
closed Position
when
gripping Position of
fingers fully
opened
Switch turned ON when fingers return.
(Light ON) Switch turned ON when gripping a
workpiece.
(Light ON) When a workpiece is held (Normal operation):
Switch to turn OFF (Light not illuminating)
When a workpiece is not held (Abnormal operation):
Switch to turn ON (Light illuminating)
Step 1)
Fully close the
fingers. Step 1)
Position
fingers for
gripping a
workpiece. Step 1)
Fully open the
fingers.
Step 2) Insert the auto switch into the switch installation groove in the direction shown in the following drawing.
Step 3) Move the auto switch in the
direction of the arrow and fasten it at a
position 0.3 to 0.5 mm beyond the
position where the indicator light
illuminates. Step 3) Slide the auto switch in the direction of the arrow until the indicator light
illuminates.
Position where
light turns ON
Position to be
secured
Note 1) It is recommended that gripping of a workpiece be performed close to the center of the finger stroke.
Note 2) When holding a workpiece close at the end of open/close stroke of fingers, detecting performance of the combinations listed in the above
table may be limited, depending on the hysteresis of an auto switch, etc.
Step 4) Slide the auto switch further in the direction of the arrow until the indicator
light goes out.
Step 5) Move the auto switch in the opposite direction 0.3 to 0.5 mm in the
direction indicated by the arrow from its location when the indicator light comes on
again.
Position where
light turns ON
Position to be
secured
Ȝ
Ȝ
Ȝ
Ȝ Ȝ
Ȝ
Ȝ
Ȝ Ȝ
0.3 to 0.5 mm
0.3 to 0.5 mm
Position to be
detected
Operation of
auto switch
12-12-3
Auto Switch
MHZ
MHF
MHL
MHR
MHK
MHS
MHC
MHT
MHY
MHW
MRHQ
Misc.
D-
20-