SMC Networks SY 5000 Series: SY7000 Series, Руководство по эксплуатации

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SY3000*-OMJ0003-A
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Operation of actuator
When an actuator, such as a cylinder, is to be driven using a valve, take
appropriate measures to prevent potential danger caused by actuator
operation
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Intermediate stopping
When a 3position closed center valve is used to stop a cylinder at
intermediate position, accurate stopping of the piston in a
predetermined position is not possible 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 stopped position for an
extended length of time. Contact SMC if it is necessary to hold a
stopped position for an extended time.
③ ③ ③ ③
Effect of back pressure when using a manifold.
Use caution when valves are used on a manifold, an actuator
malfunction due to back-pressure may occur. Special caution must be
taken when using 3 position exhaust center valve or when driving a
single acting cylinder. To prevent a malfunction, implement counter
measures such as using a single EXH spacer assembly or an individual
exhaust manifold.
④
④ ④
④Holding of pressure(including vacuum)
Holding of pressure(including vacuum) Holding of pressure(including vacuum)
Holding of pressure(including vacuum)
Since valves are subject to air leakage, they cannot be used for
applications such as holding pressure (including vacuum) in a pressure
vessel.
⑤ ⑤ ⑤ ⑤
Cannot be used as an emergency shut off valve, etc.
The valves presented in this operation manual are not designed for
safety applications such as an emergency shut off valve. If the valves
are used in this type of system, other reliable safety assurance
measures should also be adopted.
⑥ ⑥ ⑥ ⑥
Maintenance space
The installation should allow sufficient space for maintenance activities
(removal of valve, etc.).
⑦ ⑦ ⑦ ⑦
Release of residual pressure
Provide a residual pressure release function for maintenance purpose.
Especially in case of 3 position closed center valve or perfect valve,
ensure the release of residual pressure between valve and cylinder.
⑧
⑧ ⑧
⑧
Vacuum applications
When a valve is used for vacuum switching, etc. take measures against
the suction of external dust or other contaminants from vacuum pads
and exhaust ports, etc. Moreover, an external pilot type valve should be
used in this case. Contact SMC in case of an internal pilot type or air
operated valve, etc.
⑨ ⑨ ⑨ ⑨
About using the 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 a valve. Implement countermeasures not to occur any danger by the
actuator’s operation.
⑩ ⑩ ⑩ ⑩
About ventilation
When it is used inside a sealed control panel, etc. provide ventilation to
prevent a pressure increase caused by exhausted air inside the control
panel or temperature rise caused by the heat generated by valve.
-4-
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５ ５ ５ ５
Port Solenoid Valve
／ ／ ／ ／
Precautions
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Be sure to read before handing.
Selection
Warning
Caution
Design
Warning
OFF
C
R
P
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Current leakage
V
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Valve
Switching device
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Momentary energizatuon
If a double solenoid valve will be operated with momentary
energization, it should be energized for at least 0.1 second.
However, depending on the secondary load conditions, it should
be energized until the cylinder reaches the stroke end position,
as there is a possibility of malfunction otherwise.
② ② ② ②
Leakage voltage
When using a resistor in parallel the switching element or using a
C-R element (surge voltage suppressor) for protection of the
switching element, note that leakage voltage will increase due to
leakage current flowing through the resistor or C-R element. Limit
the amount of residual leakage voltage to the following values.
①
① ①
①
Confirm the specifications
The products presented in this operation manual are
designed only for use in compressed air systems (including
vacuum). Do not operate at pressures or temperatures, etc.
beyond the range of specifications, as this can cause
damage or malfunction. (Refer to specifications.) Contact
SMC when using a fluid other than compressed air (including
vacuum).
② ② ② ②
Long period of continuous energization
・
Continuous energization of the valve for extended periods of
time may have an adverse effect on the solenoid valve
performance and the peripheral equipment due to temperature
rises caused by the heat generation of the coil. Please consult
SMC if valves will be continuously energized for extended
periods of time or the energized period per day will be longer
than the de-energized period. It is also possible to shorten the
energization period by using valves of the N.O. (normally open)
type.
・
When solenoid valves are mounted in a control, employ
measures to radiate excess heat, so that temperatures remain
within the valve specification range. Use special caution when
three or more stations sequentially aligned on the manifold are
continuously energized since this will cause a drastic
temperature rise. (As for AC specifications, since the applicable
merchandises are ready to provide separately, please contact
SMC.)
DC coil: Should be 3% or less of the rated voltage
AC coil: should be 8% or less of the rated voltage