SMC Networks SYJ3000 Series Operation Manual page 5

SYJ Series
Precautions for 5 Port Solenoid Valve ①
Be sure to read before handling. Refer to main text for detailed precautions on every series.
Design / Selection
Warning
1. Confirm the specification
Products represented in this catalog are designed only
for use in compressed air systems (including vacuum).
Do not operate at pressures, temperatures, etc.,
beyond the range of specifications, as this can cause
damage or malfunction. (Refer to the specifications.)
We do not guarantee against any damage if the
product is used outside of the specification range.
2. Actuator drive
When an actuator, such as a cylinder, is to be driven
using a valve, take appropriate measures (cover
installation or approach prohibition) to prevent potential
danger caused by actuator operation.
3. Intermediate stopping
For 3-position closed center type, it is difficult to make
a piston stop at the required position accurately due to
the compressibility of air. Furthermore, since valves
and cylinders are not guaranteed for zero air leakage, it
may not be possible to hold a stopped position for an
extended period of time.
4. Effect of back pressure when using a
manifold.
Use caution when valves are used on a manifold,
because an actuator may malfunction due to
back-pressure. For 3-position exhaust center valve or
single acting cylinder, take appropriate measures to
prevent the maIfunction by using it with an individual
EXH spacer assembly, a back pressure check valve or
an individual exhaust manifold.
5. Holding of pressure (including vacuum).
Since the valve are subject to air leakage, they cannot
be used for applications such as holding pressure
(including vacuum) in a pressure vessel.
6. Not suitable for use as an emergency
shut-off valve, etc.
The valves listed in this catalog are not designed for
safety applications such as an emergency shutoff valve.
If the valves are used for the mentioned applications,
additional safety measures should be adopted.
7. Release of residual pressure
For maintenance purposes install a system for
releasing residual pressure. Especially in the case of
3-position closed center valve or double check valve
type, ensure that the residual pressure between the
valve and the cylinder is released.
8. Operation in a vacuum condition
When a valve is used for switching a vacuum, take
measures to install a suction filter or similar to prevent
external dust or other foreign matter from entering
inside the valve. In addition, at the time of vacuum
adsorption, be sure to vacuum at all times. Failure to
do so may result in foreign matter sticking to the
adsorption pad, or air leakage causing the workpiece
to drop.
9. Regarding a vacuum switch valve and a
vacuum release valve.
If a non-vacuum is installed in the middle of piping
system having a vacuum, the vacuum condition will not
be maintained. Use a valve designed for use under
vacuum condition.
10. Double solenoid type
When using the double solenoid type for the first time,
actuators may travel in an unexpected direction
depending on the switching position of the valve.
Implement measures to prevent any danger from
occurring when operation the actuator.
11. Ventilation
Provide ventilation when using a valve in a confined
area, such as in a closed control panel. For example,
install a ventilation opening, etc. in order to prevent
pressure from increasing inside of the confined area
and to release the heat generated by the valve.
12.Extended periods of continuous
energization
･If a valve will be continuously energized for an extended
period of time, the temperature of the valve will increase
due to the heat generated by the coil assembly. This will
likely adversely affect the performance of the valve and
any nearby peripheral equipment. Therefore, if the
valve is to be energized for periods of longer than 30
minutes at a time or if during the hours of operation the
energized period per day is longer than the
de-energized period, we advise using a valve with
specifications listed below
･For applications such as mounting a valve on a control
panel, incorporate measure to limit the heat radiation
so that the temperature will be high when a 3 station
manifold.
13. Do not disassemble the product of
make any modifications, including
additional machining.
Doing so may cause human injury and/or an
accident.
14.Resumption after a long period of
holding time
When resuming operation after a long period of holding
time, there are cases in which, regardless of whether
the product is in an ON or OFF state, there is a delay in
the initial response time due to adhesion. Conducting
several cycles of running in operation will solve this
problem. Please consider implementing this before
resumption
1.Precautions for 2-position double solenoid
valves
If a double solenoid valve is operated with momentary
energization, it should be energized for at least 0.1
seconds. However,
conditions, the cylinder may malfunction even when
the double solenoid valve is energized for 0.1 seconds
or longer. In this case, energize the double solenoid
valve until the cylinder is exhausted completely.
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depending on the piping
No.SYJ3000-OMM0002-B