- - 5 - -
- 5 -
VG300
∗∗−
OMH0002-B
2. Solenoid valve drive for AC with a solid state
output (SSR, TRIAC output, etc.)
1) Current leakage
When using a snubber circuit (C-R element) for surge
protection of the output, a very small amount of
electrical current will continue to flow even during the
OFF state.
This results in the valve not returning. In a situation
where the tolerance is exceeded, as in the above case,
take measures to install a bleeder resistor.
2) Minimum allowable load amount (Min. load current)
When the consumption current of a valve is less than
the output’s minimum allowable load volume or the
margin is small, the output may not switch normally.
Please contact SMC.
3. Surge voltage suppressor
If a surge protection circuits contains nonstandard diodes,
such as Zener diodes or varistor, a residual voltage that is
in proportion to the protective circuit and the rated voltage
will remain. Therefore, take into consideration the surge
voltage protection of the controller.
In the case of diodes, the residual voltage is appro-
ximately 1V.
4. Operation in a low temperature condition
It is possible to operate a valve in extreme temperature,
as low as -10
o
C. Take appropriate measures to avoid
freezing of drainage, moisture etc. in low temperature.
5. Operation for air blowing
When using a solenoid valve for air blowing, use an
external pilot type.
Additionally, when compressed air within the pressure
range of the established specifications is supplied to the
external pilot type valve’s port.
6. Mounting orientation
Mounting orientation is free.
Mounting
1. Operation manual
Install the products and operate them only after reading
the operation manual carefully and understanding its
contents. Also, keep the manual where it can be referred
to as necessary.
2. Ensure sufficient space for maintenance ac-
tivities
When installing the products, allow access for main-
tenance.
3. Tighten threads with the proper tightening
torque.
When installing the products, follow the listed torque
specifications.
4. If air leakage increases or equipment does not
operate properly, stop operation.
Check mounting conditions when air and power supplies
are connected. Initial function and leakage tests should
be preformed after installation.
5. Painting and coating
Warnings or specifications printed or affixed to the
product should not be erased, removed or covered up.
Please consult with SMC before applying paint to
resinous parts, as this may have an adverse effect due to
the solvent in the paint.
Piping
1. Preparation before piping
Before piping is connected, it should be thoroughly blown
out with air (flushing) or washed to remove chips, cutting
oil and other debris from inside the pipe.
2. Wrapping of pipe tape
When screwing piping or fittings into ports, ensure that
chips from the pipe threads or sealing material do not
enter the piping. Also, if pipe tape is used, leave 1 thread
ridge exposed at the end of the threads.
Design
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Selection
VG342 Series
3 Port Solenoid Valve / Precautions 2
Be sure to read before handling.
Caution
Caution
Warning
