Port Solenoid Valve / Precautions - SMC Networks VPX400 Series Operation Manual

Design/Selection
Warning
(1) Confirm the specifications.
This product is designed for use only in compressed air systems.
Do not use this product under pressure or temperature out of the
specified range because doing so causes damage and/or
malfunction of the product.
SMC does not guarantee the product against any damage if it is
used outside the specification range.
(2) Actuator drive
When an actuator, such as a cylinder, is to be driven using a safety
exhaust valve (hereinafter referred to as "valve"), take appropriate
measures (cover installation or approach prohibition) in advance
to prevent potential danger from being posed by actuator
operation.
(3) Pressure retention
Since the valves are subject to air leakage, they cannot be used
for applications such as pressure retention in a pressure vessel.
(4) Ventilation
Provide ventilation when using a valve in a confined area, such as
in a closed control panel. For example, provide a ventilation
opening, etc. in order to prevent pressure from increasing inside
the control panel due to discharged air and to release the heat
generated by the valve.
(5) Prohibition of disassembly and modification
Do not disassemble the product or make any modifications,
including additional machining.
Failure to follow this instruction may cause bodily injury and/or an
accident.
Caution
(1) Leakage voltage
In particular, when a resistor and a switching element are used in
parallel or a C-R device (surge voltage suppressor) is used for the
protection of the switching device, note that the leakage voltage
will increase because leakage current passes through the resistor
or C-R device. Suppress the residual voltage leakage to 3% of the
rated voltage or less.
(2) Surge voltage suppressor
1) A surge voltage suppressor built into the valve is intended to
protect the output contacts so that the surge generated inside
the valve will not adversely affect the output contacts. Therefore,
if an overvoltage or overcurrent is received from an external
peripheral device or the like, the surge voltage protection
element inside the valve may be overloaded and broken. In the
worst case, the electric circuit becomes short-circuited due to
the breakage. If the energization continues in this condition, a
large current may flow, which may cause secondary damage to
(25A-)VPX400 Series

3 port solenoid valve / Precautions 1

Be sure to read before handling.
the output circuit, peripheral device, or valve, and may also
cause fire accident. Therefore, take appropriate protective
measures, such as installation of an overcurrent protection
circuit in the power unit or drive circuit, to maintain the sufficient
safety.
2) If a surge protection circuit contains nonstandard diodes, such
as Zener diode or varistor, a residual voltage in accordance with
the protective device and rated voltage will remain. Therefore,
take into consideration the surge voltage protection of the
controller.
(3) Mounting orientation
Mounting orientation is not specified.
(4) Initial lubricant applied to main valve
Initial lubricant has been applied to the main valve.
Warning
(1) Operation Manual
Thoroughly read and understand the operation manual before
installing and operating the product.
Keep the manual at hand so that it can be referred to anytime.
(2) Securing of maintenance space
Secure a space that allows access for maintenance.
(3) Tightening of screw and strict observation of screw
tightening torque
When installing the product, tighten screws to the
recommended torque.
(4) If air leakage increases or the equipment does not
operate properly, do not use the product.
At the time of installation and maintenance, connect
compressed air and power supplies to the equipment and
perform appropriate functional and leakage inspections to make
sure that the equipment is mounted properly.
(5) Do not erase or peel off warnings or specifications
printed or labeled on the product and do not paint
over characters.
Caution
(1) For the handling of one-touch fittings, refer to the
Fittings and Tubing Precautions.
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Mounting
Piping
No. DOC1092179