Datasheet

Suction verification switch
ZSP1
Flow sensor
PFMV
Vacuum pressure gauge
GZ46
Refer to the Best Pneumatics No. 6 for details.
 Timing for Vacuum Generation and Suction Verification
A. Timing for Vacuum Generation
The time for opening/closing the valve will be counted if a vacuum is generated after the adsorption pad descends to adsorb a
workpiece. Also, there is a timing delay risk for the generating vacuum since the operational pattern for the verification switch,
which is used for detecting the descending vacuum pad, is not even.
To solve this issue, we recommend that vacuum be generated in advance, before the vacuum pad begins to descend to the
workpiece. Adopt this method after confirming that there will be no misalignment resulting from the workpiece’s light mass.
B. Suction Verification
When lifting the vacuum pad after absorbing a workpiece, confirm that there is a suction verification signal from the vacuum
pressure switch, before the vacuum pad is lifted. If the vacuum pad is lifted, based on the timing of a timer, etc., there is a risk
that the workpiece may be left behind.
In general adsorption transfer, the time for adsorbing a workpiece is slightly different since the position of the vacuum pad and
the workpiece are different after every operation. Therefore, program a sequence in which the suction completion is verified
by a vacuum pressure switch, etc. before moving to the next operation.
C. Set Pressure for Vacuum Pressure Switch
Set the optimum value after calculating the required vacuum pressure for lifting a workpiece.
If a higher pressure than required is set, there is a possibility of being unable to confirm the suction even though the
workpiece is adsorbed. This will result in a suction error.
When setting vacuum pressure switch set values, you should set using a lower pressure, with which a workpiece can be
adsorbed, only after considering the acceleration or vibration when a workpiece is transferred. The set value of the vacuum
pressure switch shortens the time to lift a workpiece. Since the switch detects whether the workpiece is lifted or not, the
pressure must be set high enough to detect it.
When adsorbing and transferring a workpiece, verify at the vacuum
pressure switch as much as possible (In addition, visually verify the
vacuum gauge, especially when handling a heavy or a hazardous
item.).
Approx. ø1 adsorption nozzle
The difference in pressure between ON and OFF becomes small
depending on the capacity of the ejector and vacuum pump. In such a
case, it will be necessary to use ZSP1 that can detect a small
hysteresis or a flow switch.
Note) • A vacuum generator with a large suction capacity will not
be detected properly, so an ejector with an appropriate
capacity must be selected.
• Since the hysteresis is small, vacuum pressure must be
stabilized.
Vacuum Pressure Switch (Series ZS), Vacuum Pressure Gauge (Series GZ) Timing Chart Example
During vacuum release
During adsorption
Cylinder UP
Vacuum pressure switch
set value
Vacuum
pressure
switch
V port
vacuum
pressure
Cylinder DOWN
Cylinder switch
Supply valve
Release valve
By lowering the
setting of the vacuum
switch, the takt time
can be shortened.
Vacuum
pressure at
operation
Atmospheric
pressure
Model Selection
Front matter 22