36
®
Series SYJ3000
Operations Guide 1
Operation of actuator
When an actuator, e.g. cylinder, is to be operated using a
valve, take appropriate measures to prevent potential injuries to
personnel caused by the actuator movement.
Stopping the cylinder in a midstroke position.
Using a 3 position closed center valve to hold a cylinder in a
midstroke position is not recommended. Accurate stopping of
the piston in a predetermined position is not possible due to the
compressibility of air. Internal valve and cylinder leakage will
cause the piston to drift if a midstroke position is held for any
length of time. If midstroke positioning is required, please
contact SMC.
Effect of back pressure when using manifold
Possible malfunction due to back-pressure may result when
valves are used on a manifold. If this problem occurs take
appropriate countermeasures.
Holding pressure (including vacuum)
Since the valve may have slight internal air leakage, it may not
be suitable for holding pressure (including vacuum) in a tank or
other vessel for an extended period of time.
Not suitable for use as an emergency shutoff valve
The valve represented in this catalog is not intended for use as
an emergency shutoff valve. If the valve is used in this type of
system, other positive shutoff components should be used in
conjunction.
Maintenance space
Installation should consider that enough space is provided for
maintenance (removal of valve, etc.).
Release of residual pressure
Install a method for the release of residual pressure for
maintenance purpose.
Using in vacuum condition
When valve is used for switching vacuum, take precautions for
the suction of external dust or other contaminants that may lead
to valve malfunction.
System Design Precautions
Energization time
The double solenoid valve must be energized for at least 0.05
second to ensure proper operation.
Leakage Voltage
When a C-R device (Surge voltage
suppressor) is used for the
protection of switching device,
note that leakage voltage will
increase due to the C-R device.
Suppress residual leakage voltage as follows :
DC coil : 3% or less of rated voltage
AC coil : 8% or less of rated voltage
Use in low temperature environment
Valve use is possible to extreme of -10
°
C. Take appropriate
measures to avoid freezing of drain, moisture etc. by use of an
air dryer.
Mounting orientation
Mounting position is free. No specific orientation is necessary.
Switching device
Resistor
OFF
Current leakage
Valve
Power
source
Voltage
leakage
Confirm specifications
Product represented in this catalog is designed only for use in
compressed air systems (including vacuum). Do not use with
pressure or temperature beyond the specification range.
Contact SMC when using a fluid other than compressed air
(including vacuum).
Long period of continuous energization
Contact SMC when the valve is to be continuously energized
for a long period.
Selection
If air leakage is increasing or equipment is not
properly operating, discontinue use of the valve and
inspect the cause.
Check mounting conditions after air and power supplies are
connected. Initial function and leakage tests should be
performed after installation.
Install only after reading and understanding the
safety instructions.
Keep the catalog on file so that it can be refered to when
necessary.
Coating
Warnings or specifications indicated on the product should not
be erased, removed, or covered up. If paint is applied to
resinous parts it may have an adverse effect due to paint
solvent.
Installation
1
1
2
3
4
5
6
1
2
3
2
3
4
5
6
7
8
36
®
36
®
36
®
36
®
36
®
