Document No.ZL-OM01001
- 29 -
Vacuum
failure
over time
(absorbs
properly
initially.)
Adsorbing part has some problem,
such as deterioration of the vacuum
pad, or leakage due to frictional
wear.
→ Replace the vacuum pad with a new one.
→ Revise the adsorption conditions (such as
compatibility of the vacuum pressure with the
pad/work piece)
The filter case gasket has come off
when the filter element
was replaced.
Vacuum pressure leaks if the gasket has come off or
out of the groove when maintenance of the filter was
performed .
→ Check if it is mounted properly.
Defective operation caused by
energization of solenoid valve for
an extended period of time.
(Energized for 10 minutes or more
or operated with the duty ratio of
50% or more.)
→ Shorten the energization time of the solenoid
valve.
→ Provide forced ventilation in the operating
environment in order to prevent temperature
increase around the solenoid valve.
Work
piece is
not
released
smoothly.
Vacuum break flow is not large
enough.
→ Open the vacuum break flow adjusting needle.
→ For the ejector with individual ports for release
pressure (PD) and supply pressure (PV), increase
the pressure at the release pressure port.
The vacuum pad surface is worn
out, making it sticky.
→ Replace the vacuum pad with a new one.
→ Revise the material and configuration of the
vacuum pad.
→ Use a special pad which has a blasted adsorption
surface. (Made-to-order)
Vacuum pressure is too high.
→ Decrease the supply pressure to lower the
vacuum pressure.
→ Decrease the pressure in the piping on the
vacuum side with a vacuum regulator.
Work piece sticks to the pad due to
static electricity.
Vacuum break signal timing
is inappropriate .
If the pad is lifted before the work piece is
completely released from the pad, the work piece is
lifted together with the pad due to the viscosity of the
pad.
→ Revise the timing of the vacuum break and the
lifting of the pad.
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