Wiring; Lubrication; Air Supply - SMC Networks SYJ Series Operation Manual

Be sure to read before handling. Refer to main text for detailed precautions on every series.
4.
Closed center and double check valve types
For closed center type, check the piping to prevent air
leakage from the piping between the valve and the
cylinder.
5. Connection of fittings
When screwing fittings into valves, tighten as follows.
(1) Follow the procedures below when installing an
SMC fitting, etc.
1) M3 types
After tightening the fitting by hand, use a wrench to
tighten the fitting an additional approximately 1/4
turn. As a reference value, tightening torque is 0.4
to 0.5N･m.
Note) If tightened excessively, the thread of the
product may break or the gasket may deform.
If tightened insufficiently, the thread of the
product may become loose. In either case, air
leakage can occur.
2) M5 types
After tightening the fitting by hand, use a wrench to
tighten the fitting a additional approximately 1/6 to
1/4 turn. As a reference value, tightening torque is 1
to 1.5 N･m.
(2) Follow the procedure of the manufacture when
fittings other than SMC is used.
2) Rc type
Tighten with the proper torque shown below.
Tightening Torque for Piping Applicable
Screwing piping Reasonable
torque N･ ･ ･ ･ m
Rc1/8
Rc1/4
6. Piping to products
When piping to a product, refer to the instruction
manual to avoid mistakes regarding the supply port,
etc.

Wiring

Caution
1. Polarity
When connecting power to a solenoid valve with a DC
specification and equipped with a light or surge voltage
suppressor, check for polarity. If there is polarity, take
note of the following.
No diode to protect polarity.
If a mistake is mode regarding the polarity, damage
may occur to the diode in the valve, the switching
element in a control device or power supply
equipment, etc.
With diode to protect polarity.
If polarity connection is wrong, the valve does not
operate.
2. Applied voltage
When electric power is connected to a solenoid valve,
be careful to apply the proper voltage. Improper voltage
may cause malfunction or coil damage.
3. Check the connections.
Check if the connections are correct after completing all
wiring.
SYJ Series
Precautions for 3/5 Port Solenoid Valve ③ ③ ③ ③
tightening
7~ 9
12~ 14
- 6 -

Lubrication

Caution
1. Lubrication
1) The valve has been lubricated for life by the factory
and does not require any further.
2) If a lubricant is used in the system, use class 1
turbine oil (no additive), ISO VG32.
Once a lubricant is used in the system, lubrication
must be continued because the original lubricant
applied during manufacturing will be washed away.
If turbine oil is used, refer to the Material Safety Data
Sheet (MSDS) of the oil.
3) Please contact SMC regarding class 2 turbine oil

Air Supply

Warning
1.
Type of fluids
Please consult with SMC when using the product in
applications other than compressed air.
2.
When there is a large amount of drainage.
Compressed air containing a large amount of drainage
can cause malfunction of pneumatic equipment. An air
dryer or water separator should be installed upstream
from filters.
3.
Drain flushing
If condensation in the drain bowl is not emptied on a
regular basis, the bowl will overflow and allow the
condensation to enter the compressed air lines. It
causes malfunction of pneumatic equipment. If the
drain bowl is difficult to check and remove, installation
of a drain bowl with an auto drain option is
recommended.
For compressed air quality, refer to SMC's Best
Pneumatics catalog.
4.
Use clean air
Do not use compressed air that contains chemicals,
synthetic oils including organic solvents, salt or
corrosive gasses, etc., as it can cause damage or
malfunction.
Caution
1.
When extremely dry air is used as the fluid,
degradation of the lubrication properties in
side the equipment may occur, resulting in
reduced reliability (or reduced service life) of
the equipment. Please consult with SMC.
2.
Install an air filter.
Install an air filter upstream near the valve. Select an
air filter with a filtration size of 5 µm or smaller.
3.
Take measures to ensure air quality, such as
by installing an aftercooler, air dryer, or water
separator.
Compressed air that contains a large amount of
drainage can cause malfunction
equipment such as valves. Therefore, take appropriate
measures to ensure air quality, such as by providing an
aftercooler, air dryer, or water separator.
of pneumatic
No.SYJ3000-OMM0002-A