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3-16. Cautions for the compressed air supply (source of supply air) facility
As large as 90 % of failures in pneumatic equipment (air cylinders, air solenoid valves) are caused by
"contaminated air."
Compressed air contains lots of impurities such as moisture, dust, deteriorated oil and carbon parti-
cles. If such "contaminated air" is used without taking any measures, it can a cause of troubles, inviting
reduction in productivity due to mechanical failures and reduced availability.
Be sure to install the standard air supply facility shown below whenever the machine provided with
pneumatic equipment is used.
Standard air supply facility to be prepared by the user
Standard equipment supplied by JUKI
Air compressor
After cooler
Air tank
Main line filter
Air dryer
Mist separator
Auto-drain
Auto-drain
Quality of the air supply
When the supply air contains a considerable amount of moisture
Ambient environment
When our machine is installed at a place where the temperature
greatly changes in the morning and in the evening from that in the
daytime or freeze is like to occur
In the aforementioned cases, be sure to install an air dryer.
(Most troubles in the air solenoid valves are caused by carbon.)
Be sure to install a mist separator.
When the supply air contains a considerable amount of carbon
and dust
Filter regulator
Air solenoid valve
Air cylinder
Cautions for main piping
•
Be sure to slope main piping by a falling gradient of 1 cm per 1 m in the direction of air flow.
•
If the main piping is branched off, the outlet port of the compressed air should be pro-
vided at the top part of the piping using a tee in order to prevent drain settling inside
the piping from flowing out.
•
Auto drains should be provided at all lower points or dead ends in order to prevent the
drain from settling in those parts.
