SMC Networks VFR4000 Series, Руководство по эксплуатации

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VFR4000-OMH0003-D
Design / Selection
1. Confirm the specifications.
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.) Please contact SMC when using a fluid
other than compressed air (including vacuum). 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 (such as the installation of a
cover or the restricting of access to the product) to prevent
potential danger caused by actuator operation.
3. Intermediate stops
For the 3-position closed center or double check valve types, it
is difficult to make the 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. Please contact SMC if it
is necessary to hold a stopped position for an extended period
of time.
4. Effects of back pressure when using a manifold
Use caution when valves are used on a manifold because
actuators may malfunction due to back pressure.
Especially when using a 3-position exhaust center valve or a
single acting cylinder take appropriate measures to prevent
malfunction by using it with an individual EXH spacer
assembly(VVFS4000-R-04-1,2).
5. Holding 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.
6. Not suitable for use as an emergency shutoff 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 in such applications, additional safety measures
should be adopted.
7. Release of residual pressure
For maintenance and inspection purposes install a system for
releasing residual pressure. Especially in the case of the
3-position closed center valve or double check valve types,
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 supply a constant supply
of vacuum. Failure to do so may result in foreign matter sticking
to the adsorption pad or air leakage, causing the workpiece to
drop.
9. 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.
10. 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. This will likely adversely affect the
performance of the solenoid valve and any nearby peripheral
equipment. Therefore, when it is continuously energized or the
energized period per day is longer than the de-energized period
use a DC specification valve. For applications such as
mounting a valve on a control panel, incorporate measure to
limit the heat radiation so that it is within the operating
temperature range. For example, the temperature will be high
when a 3 station manifold or larger is put next to other valves
and continuously energized.
If conflicting instructions are given in the “Specific Product
Precautions” or on the “How to Order Valves” page, give them
priority.
11.Do not disassemble the product or make any
modifications, including additional machining.
Doing so may cause human injury and/or an accident.
12.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, depending on the piping 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.
2. Leakage voltage
Take note that the leakage voltage will increase when a resistor
is used in parallel with a switching element or when a C-R
circuit (surge voltage suppressor) is used for protecting a
switching device because of the leakage voltage passing
through the C-R circuit. The suppressor residual leakage
voltage should be as follows.
DC coil 3% or less of the rated voltage
AC coil 20% or less of the rated voltage
VFR4000 Series
5 Port Solenoid Valve / Precautions 1
Be sure to read before handling.
Warning
Caution