SMC Networks VXF2 Series, Руководство пользователя, Страница: 34 / 40

2 Port Solenoid Valve For Dust Collector
Series VXF2/VXFA2
Series
VXF2/VXFA2
Specific Product Precautions 1
Be sure to read before handling. Refer to back cover for Safety Instructions, “Handling
Precautions for SMC Products” (M-E03-3) and the Operation Manual for 2 Port Solenoid
Valves for Fluid Control. Please download it via our website, http://www.smcworld.com
Silencer
Caution
1. The silencer’s affect on the valve response times is
initially negligible, but will change due to clogging after
extended use. Replace it after using about 500,000
times. This number is subject to change based on fluid
quality and energizing time.
2. When using a silencer, ensure there is space for repla-
cing the silencer.
Design
Warning
1. Cannot be used as an emergency shutoff valve etc.
The valves presented in this catalogue are not designed for
safety applications such as an emergency shutoff valve. If the
valves are used in this type of system, other reliable safety
assurance measures should also be adopted.
2. Extended periods of continuous energization
The solenoid coil will generate heat when continuously
energized. Avoid using an enclosed space. Install it in a
well-ventilated area. Furthermore, do not touch it while it is
energized or inmediately after it is de-energized.
3. When the conduit type is used as equivalent to an
IP65 enclosure, install a wiring conduit etc.
Selection
Warning
1. Air quality
1. Use clean air.
Do not use compressed air that contains chemicals, synthetic
oils including organic solvents, salt or corrosive gases, etc.,
as it can cause damage or malfunction.
2. Install an air filter.
Install an air filter close to the valve on the upstream side. A
filtration degree of 5 μm or less should be selected.
3. Install an aftercooler or air dryer, etc.
Compressed air that contains excessive drainage may cause
malfunction of valves and other pneumatic equipment. To
prevent this, install an aftercooler or air dryer, etc.
4. If excessive carbon powder is generated, eliminate it
by installing a mist separator on the upstream side of
valves.
If excessive carbon powder is generated by the compre-
ssor, it may adhere to the inside of the valves and cause
a malfunction.
Selection
Warning
2. Ambient environment
Use within the allowable ambient temperature range. Check
the compatibility of the product’s parts materials with the
ambient atmosphere.
3. Countermeasures against static electricity
Take measures to prevent static electricity since some fluids
can cause static electricity.
4. Low temperature operation
The valve can be used in an ambient temperature of between
–20 to –10
°
C.
5. Fluid properties
Use a general compressed air with a filter of 5
μ
m or less
mounted on the inlet of the piping. (Excluding dry air)
AC/Class B built-in full-wave rectifier coil: 10% or less of rated voltage
DC coil: 2% or less of rated voltage
Caution
1. Leakage voltage
Particularly when using a resistor in parallel with a switching element and
using a C-R element (surge voltage suppressor) to protect the switching
element, take note that leakage current will flow through the resistor, C-R
element, etc., creating a possible danger that the valve may not turn off.
2. The response performance and start-up speed of air
operated type (VXFA2) is slower compared to the solenoid
type (VXF2). Refer to the data for pilot piping.
3. Note that for DC units, idle time and return time increase
if the voltage is lowered. If a surge voltage suppressor is
installed, the return speed decreases.
R
SOL.
OFF
Switching element
C
Leakage current
Leakage voltage
Power supply
31