16
Warning
caution
Detailed safety instrution
Please read it before use, Appendix-P.38 for 'Safety Precautions', Appendix P.40 for 'Common Precautions
for products', and Appendix P.44 for 'Common Precautions for Vacuum Equipment'.
Make sure that the leakage current is less than 1mA, when operating a valve unit. Leakage current larger
than that may cause malfunction.
Vacuum generator with vacuum retention function permits some vacuum leakage. Provide an appropriate
safety measure when vacuum retention for long period of time is required.
The coil in a pilot solenoid valve generates heat under the following ①-③ conditions.The heat may cause
dropping life cycle, malfunctions and burn or may affect negatively on peripheral machines. Contact us when
the power is applied to the vacuum generator under the following conditions:
①The power is continuously ON for over 2 hours.
②High-cycle operation.
③ Even when intermittent running of the generator is carried out, the total operation time per day is longer than
non-operation time.
Regarding double-solenoid types (VJ□□A…), the switchover valve (main valve) is placed in neutral after
the supply of pilot air has been suspended (the same is true when the valve is being operated for the first
time after shipment). When resuming the supply of pilot air, be sure to send a signal to the pilot valve, or
conduct switchover operations manually as required.
Do not give an excessive tensile strength and bending on a lead wire. Otherwise, breaking wire or damage
on connector may be caused.
When manifold type is selected, dropping the performance or having an effect to other vacuum ports can
be caused depending on number of stations or a combination of mounting units. Contact us for any unclear
points.
Compressed air contains many kinds of drains such as water, oxidized oil, tar and other foreign substances.
Dehumidify the compressed air by using an after-cooler or a dryer and improve the air quality, since those
drains seriously impair the performance of the vacuum generator.
Do not use lubricators.
Since pipe rust cause malfunctions, a filter finer than 5
μ
m should be placed right before the air supply port.
Do not use the vacuum generator under the condition of corrosive and / or inflammable gas. Also do not
use these gasses as fluid medium.
Do not operate a blow-off valve during vacuum generating.
When replacing vacuum port cartridge, first remove any foreign substances clinging to them and the
surrounding areas, then firmly insert pins into cartridges.
When replacing a supply port block, make sure not to lose the seal rubber and remove the foreign substances
stuck around the block. Tighten the screw to fix the block with 0.27-0.3Nm of the tightening torque.
For check type, if the vacuum port is closed when the vacuum is blown-off, the residual pressure in the check
valve may be applied and vacuum switching may not be possible.
In above case, disassemblling vacuum filter module will release residual pressure and it will operated again.
