Specifications

1. Create a safe design, which addresses the
possibility of accidents resulting from a drop
in vacuum pressure due to power failure or
trouble with the air supply, etc.
If vacuum pressure drops and there is a loss of vacuum pad adsorp-
tion force, work pieces being carried may fall, causing a danger of
human injury and/or damage to machinery. Safety measures should
be implemented, such as the installation of drop prevention guides.
2. Use vacuum specifications for vacuum
switching valves and vacuum breakers.
If valves which do not meet vacuum specifications are installed in
vacuum piping, vacuum leakage will occur. Be certain to use vacu-
um specification valves.
3. Select ejectors which have a suitable suction
flow rate.
<When there is a vacuum leak from the work piece or the pip-
ing>
If the ejector's suction flow rate is too low, this will cause poor adsorp-
tion.
<When piping is long or of large diameter>
The adsorption response time will increase due to the increased vol-
ume of the piping.
Select ejectors with a suitable suction flow rate by referring to their
technical data.
4. If the suction flow rate is too high, setting of
vacuum switches will become difficult.
In the case of adsorption on a small work piece of only a few mil-
limeters, if an ejector is selected which has a high suction flow rate,
the pressure difference when adsorbing and releasing the work
piece is small. Since setting of the vacuum switch may become dif-
ficult, an appropriate ejector should be selected.
5. When two or more pads are piped to one ejec-
tor, if one pad releases its work piece, the
other pads will also release.
When one pad is removed from its work piece, there is a drop in vac-
uum pressure which causes the other pads to release their work
pieces also.
6. Use piping with an adequate effective sec-
tional area.
Select piping for the vacuum side which has an adequate effective
sectional area, so that the ejector's maximum suction flow rate can
be accommodated by the piping.
Also, make sure that there are no unnecessary restrictions or leaks,
etc., along the course of the piping.
The piping on the air supply side must be designed so that it corre-
sponds to each ejector's air consumption. The effective sectional
area of tubing, fittings and valves, etc., should be sufficiently large,
and the pressure drop reaching the ejector should be kept to a min-
imum.
Further, design of the air supply should be performed while taking
into consideration the ejector's maximum air consumption and the air
consumption of other pneumatic circuits.
1. For information on related items, such as
directional control equipment and drive equip-
ment, refer to the caution sections in each
respective catalog.
Design & Selection
Warning
12
Caution
Series ZL
Vacuum Equipment Precautions 2
Be sure to read before handling.
Mounting
1. Do not obstruct the exhaust port of the ejector.
If the exhaust port is obstructed when mounted, a vacuum will not be
generated.
Warning
Piping
1. Avoid disorganized piping.
Piping which is direct and of the shortest possible length should
be used for both the vacuum and supply sides, and disorganized
piping should be avoided. Unnecessary length increases the pip-
ing volume, and this increases the response time.
2. Use piping having a large effective section-
al area on the exhaust side of the ejector.
If the exhaust piping is restrictive, there will be a decline in the
ejector's performance.
3. Make sure that there are no crushed areas in
the piping due to damage or bending.
Caution
Operating Environment
1. Do not operate in locations having an atmos-
phere of corrosive gases, chemicals, sea
water, water or steam, or where there will be
contact with the same.
2. Do not operate in locations having an explo-
sive atmosphere.
3. Do not operate in locations where vibration
or impact occurs.
Confirm the specifications for each series.
4. In locations which receive direct sunlight,
provide a protective cover, etc.
5. In locations near heat sources, block off any
radiated heat.
6. In locations where there is contact with
water, oil or welding spatter, etc., implement
suitable protective measures.
7. In cases where the vacuum unit is surround-
ed by other equipment or it is energized for
an extended time etc., implement measures
to radiate excess heat so that temperatures
remain within the range of specifications.
Warning
1. Clean suction filters and silencers on a regu-
lar basis.
The performance of ejectors will deteriorate due to clogging in fil-
ters and silencers. Large capacity filters should be used, espe-
cially in dusty locations.
Maintenance
Warning