ELECTRIC CIRCUITS (Section 5.4)
!
CAUTION :
PERIODIC INSPECTION (Section 6.1)
!
WARNING :
!
CAUTION :
DISASSEMBLING AND REASSEMBLING (Section 6.2)
!
WARNING :
a) Check for the presence of any current leak from the
external control device because it may cause an er-
roneous valve operation.
When a programmable controller or a similar control de-
vice is used, a current leak may prevent the normal re-
turning of the valve when the solenoid is de-energized.
b) Restriction on current leak
When controlling solenoid valves using a programmable
controller or a similar control device, make sure that the
current leak in the programmable controller output is
equal to or less than the level shown in the table below.
A current leak larger than the allowable level may cause
an erroneous valve operation.
CR circuit
C
Contact
R
Programmable
controller
Before providing a maintenance service, cut the power
and the supply of compressed air and confirm the ab-
sence of residual pressure.
The above is required to ensure safety.
Regularly perform the daily and periodic inspections to
correctly maintain product performance.
If the product is not correctly maintained, product per-
formance may deteriorate dramatically, resulting in a
shorter service life, fractures of components, and mal-
functions.
Before disassembling and reassembling solenoid valves,
read the instruction manual carefully and understand the
instructions.
A person who disassembles and reassembles a solenoid
valve system needs to have knowledge for safely per-
forming such operation based on the understanding about
the mechanisms and operating principles of solenoid
valves.
Personnel involved in this step must have passed the
Pneumatic Pressure Skill Test Class 2 or higher.
−8−
AC100V
Leakage
AC200V
current
DC24V
Solenoid valve
3.0 mA or lower
1.5 mA or lower
1.8 mA or lower
[SM-213928-A/2]
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