Mounting; Piping - SMC Networks SYJ Series Operation Manual

SYJ Series
Precautions for 3/5 Port Solenoid Valve ② ② ② ②
Be sure to read before handling. Refer to main text for detailed precautions on every series.
3. Solenoid valve drive for AC with 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
the 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.
4. Surge voltage suppressor
If a surge protection circuit 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 approximately 1 V.
5. Surge voltage intrusion
With non-polar type solenoid valves, at times of sudden
interruption of the loading power supply, such as
emergency shutdown, surge voltage intrusion may be
generated from loading equipment with a large capacity
(power consumption), and the solenoid valve in a
de-energized state may switch over (see Figure 1).
When installing a breaker circuit for the loading power
supply, consider using a solenoid valve with polarity
protection diode), or install a surge absorption diode
between the larding equipment COM line and the output
equipment COM line (see Figure 2).
6.
Operation in a low temperature condition
It is possible to operated a valve in extreme temperature,
as low as -10 ℃. Take appropriate measures to avoid
freezing of drainage, moisture etc. in low temperature.
7.
Operation for air blowing
When using a solenoid valve for air blowing, use an
external pilot type. Use caution because the pressure
drop caused by the air blowing can have an affect on the
internal pilot type valve and external pilot type valves
are used on the same manifold.
Additionally, when compressed air within the pressure
range of the established specifications is supplied to the
external pilot type valve's port, and a double solenoid
valve is used for air blowing, the solenoids should
normally be energized when air is being blown.
8. Mounting orientation
Refer to the specifications of each series.

Mounting

Warning
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
activities.
When installing the products, allow access for
maintenance.
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 operated properly, stop operation.
Check mounting conditions when air and power
supplies are connected. Initial function and leakage
tests should be performed 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

Caution
1.
Refer to the Fittings and Tubing Precautions
for handling one-touch fittings.
2.
Preparation before piping
Before piping is connected, it should be thoroughly
blow out with air (flushing) or washed to remove chips,
cutting oil and other debris from inside the pipe.
3. 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 ridges exposed at the end of the threads
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No.SYJ3000-OMM0002-A