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37
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Operations Guide 2
Series SYJ3000
Polarity
When DC power is connected to a solenoid valve equipped
with light and/or surge voltage suppressor, check for polarity
indications.
No diode to protect polarity :
If polarity connection is wrong, the diode in the valve or
switching device at control equipment or power supply may be
damaged.
With diode to protect polarity :
If polarity connection is wrong, the valve does not switch.
Applied voltage
When electricity is applied to the solenoid valve, be careful to
apply the proper voltage. Improper voltage may cause
malfunction or coil damage.
Connection
Make sure connections are tight after wiring.
Wiring
Before piping
Make sure that chips, cutting oil, dust etc., in contact with piping
are removed (flushing) before installation.
Sealant tape
When installing piping or fittings into a port, ensure that sealant
material does not enter the port internally.
When using sealing tape, leave 1.5 to 2 threads exposed on
the end of pipe/fitting.
Piping
Tightening torques
When installing fitting, etc., follow the given torque levels below.
Thread
M3
M5
Rc(PT)1/8
Rc(PT)1/4
0.78 (3 to 5)
13 to 17.3 (15 to 20)
61 to 78 (70 to 90)
104 to 121 (120 to 140)
Appropriate tightening torque inch-lbs. (kgf-cm)
Tightening torque
Winding
direction
Seal tape
2 thread to be
left exposed
Lubrication
The valve has been lubricated for life at manufacture, and
does not require lubrication in service.
If a lubricant is used in the system, use turbine oil Class 1,
ISO VG32 (no additives). Once lubricant is used in the system,
you must continue to lubricate as the original lubricant applied
during manufacturing will be washed away.
Contact SMC for recommended turbine oil Class 2, ISO
VG32 (with additives).
Lubrication
Use clean air
If the compressed air supply includes chemicals, synthetic
materials (including organic solvents), salinity, corrosive gas,
etc., it can lead to damage or malfunction.
Supply Air
Install an air filter
Install an air filter at the upper stream side of the valve.
Filtration degree should be 5 m or less.
Install an air dryer, after cooler, etc..
Air that includes excessive condensate may cause malfunction
of valve and other pneumatic equipment. To prevent this,
install an air dryer, after cooler etc..
If excessive carbon powder is present in the line,
install a mist separator on the upstream side of the
valve.
Refer to "Air Cleaning Equipment" catalog for compressed air
quality.
Piping to product
When installing piping to a product, refer to operation manual to
avoid mistakes.
Precautions for closed center valves:
When using a closed center or perfect spacer type, make sure
that there are no air leaks in the piping between the valve and
the cylinder.
2
1
1
1
1
2
3
4
2
3
4
5
1
2
3
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