-49-
No. TQ1230001-OM104-C
9.Trouble shooting
Condition &
Description of
improvement
Contributing factor
Countermeasure
Initial gripping
problem (During
trial operation)
Gripping area is small.
(Lifting force is lower than the
workpiece mass.)
Recheck the relationship between workpiece mass
and lifting force.
- Use a suction cup with a large
gripping area.
- Increase the quantity of suction cups.
Vacuum pressure is low.
(Leakage from
gripping surface)
(Air permeable workpiece)
Eliminate (reduce) leakage from gripping
surface.
- Reconsider the shape of a suction cup.
Check the relationship between suction flow rate and
arrival pressure of vacuum ejector.
- Increase gripping area.
Inadequate supply pressure of
vacuum ejector
Measure supply pressure in vacuum generation state.
- Use standard supply pressure.
- Reconsider compressed air circuit (line).
Clogging of vacuum ejector
(Infiltration of foreign matter during
piping)
Remove foreign matter.
The pressure just before the
supply (P) port is low.
Depending on the piping volume (piping length and
diameter), if the pressure just before the supply (P)
port falls below 0.5MPa, the performance such as
vacuum pressure may reduce.
- Raise the upstream pressure,and the pressure just
before the supply (P) port becomes 0.5MPa.
Late vacuum
achieving time
(Shortening of
response time)
The set vacuum pressure for the
suction verification is too high.
Set to suitable setting pressure.
Fluctuation in
vacuum pressure
Fluctuation in supply pressure
Reconsider compressed air circuit (line).
(Addition of a tank etc.)
Vacuum pressure may fluctuate
under certain conditions due to
ejector characteristics.
Lower or raise supply pressure a little at a time, and use
in a supply pressure range where vacuum pressure
does not fluctuate.
Occurrence of
abnormal noise
(intermittent noise)
from exhaust of
vacuum ejector
Intermittent noise may occur
under certain conditions due to
ejector characteristics.
Lower or raise supply pressure a little at a time, and
use in a supply pressure range where the intermittent
noise does not occur.
Gripping problem
over time
(Gripping
is
normal during trial
operation.)
Clogging of the silencer
Replace the silencer.
Add a filter to supply (compressed) air circuit.
Clogging of the mesh
Clean the mesh periodically as necessary by washing,
air blow and so on or replacing plate B.
Refer to “7.2 Maintenance for suction cup”.
Presence of foreign matter in the
ejector.
Remove foreign matter.
Replace the ejector
Add a filter to supply (compressed) air circuit.
Cup (rubber) deterioration,
cracking, etc.
Replace cups.
Check the compatibility of vacuum cup material and
workpiece.
Workpiece is not
released.
The increase of stickiness due to
the wearing of the cup (rubber).
Replace cups.
Check the compatibility of the cup material and
workpiece.
Vacuum pressure is too high.
Set the vacuum pressure to the minimum value
necessary.