-78-
No. ZK2-OM01301
No.
Countermeasure
(13)
When the ejector vacuums the workpiece, high speed air coming out of the nozzle collides into the
diffuser I.D. and bounces back, generating vibration in the exhaust air. Because of this, the vacuum
pressure fluctuates slightly and is not stabilized.
There should be no functional problem with the ejector. The phenomenon causes noise or could be
a problem for the setting of vacuum switch. The noise can be eliminated by changing the supply
pressure.
Adjust the pressure regulating valve for supply pressure while checking the exhaust noise and
vacuum pressure until the noise disappear.
Ejector may generate noise due to the increase of exhaust resistance. When the silencer becomes
dirty, the replacement of the silencer element may improve the condition.
(14)
In case of centralized piping, the exhausted air flows back into the ejector exhaust path which is not
operating, and then exhausted from the vacuum port. In case of the manifold common exhaust,
change it to the optional exhaust interference prevention valve type. It is possible to order a single
exhaust interference prevention valve. When the individual exhaust type is a common piping,
change it to individual exhaust piping, or change it to exhaust interference prevention valve
type. Please refer to the product catalogue for mounting the exhaust interference prevention valve.
(15)
Release air is not output if the vacuum break flow adjusting needle is fully closed. Adjust the needle
in an appropriate position.
(16)
If oil mist enters into the product, the grease of the valve assembly and main valve is washed away
with the mist, adversely affect the valve operation. In addition, the life of the main valve may be
shortened. Install the mist separator and air filter to the supply air piping for the ejector.
(17)
If the suction filter is clogged, relief air passing through the filter decreases. Liquid or fine particles
enter into the filter element fibers. Periodic maintenance or installation of an external air suction
filter with a large capacity is recommended.
(18)
The vacuum pad surface contacting with the workpiece is deteriorated over the number of
contact. The workpiece may not be contacted correctly if the surface is deteriorated due to the
increase of the rubber viscosity. If the rubber viscosity increases, replace the pad.
(19)
The product with pressure switch with energy saving function reduces air consumption by stopping
air supply by creating vacuum between the check valve and pad in the ejector while adsorbing the
workpiece. When the holding vacuum decreases, the supply valve turns on at the previously set
threshold to supply vacuum pressure so that the workpiece does not fall.
Therefore, if the holding time is very short, highly frequent ON/OFF operation will cause
phenomenon like chattering. In this case, improve the leakage or release the setting of energy
saving. Contact your sales representative for release method.
(20)
If the check valve is deformed, vacuum pressure is not maintained. In case of individual exhaust,
if the ejector is operated with the exhaust port is pressurized or blocked, the check valve is
deformed and held in the filter case vacuum path, making sealing impossible. When the deformed
check valve does not return to flat, replace the check valve with a new one.
