SMC Networks VFR4000 Series, Operation Manual

Page: 7 / 17

- 6 -
VFR4000-OMH0003-D
Piping
5. Connection of fittings
When screwing fitting into the valve, tighten it as follows.
1) When using a fitting other than SMC fitting, follow the
instructions given by relevant fitting manufacturer.
2) When screwing the Rc thread or fitting, follow the
procedures below to tighten it.
Tighten with the proper torque shown below.
Connection
thread
Proper tightening torque
(N
･
m)
Rc 1/8 7 to 9
Rc 3/8 22 to 24
Rc 1/2 28 to 30
6. Piping to products
When piping to a product, avoid mistakes regarding the supply
port, etc.
Wiring
1. The solenoid valve is an electrical product. For
safety, install an appropriate fuse and circuit breaker
before use.
1. Polarity
When connecting power to a solenoid valve with a DC
specification and a light or surge voltage suppressor, check for
polarity. If there is polarity, take note of the following.
With diode to protect polarity:
If the polarity connection is wrong, the valve will 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.
4. External force applied to the lead wire
If an excessive force is applied to the lead wire, this may cause
faulty wiring. Take appropriate measures so that a force of 30 N
or more is not applied to the lead wire. When instructions are
given in the Specific Product Precautions, follow these
specifications.
Lubrication
1. Lubrication
1) All valves have been lubricated for life by the manufacturer
and therefore, do not require lubrication while in service.
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 (SDS) of the oil.
Please contact SMC for details about class 2 turbine oil (with
additives) ISO VG32.
2. Lubrication amount
If the lubrication amount is excessive, the oil may accumulate
inside the pilot valve, causing malfunction or response delay.
So, do not apply a large amount of oil. When a large amount of
oil needs to be applied, use an external pilot type to put the
supply air on the pilot valve side in the non-lube state. This
prevents the accumulation of oil inside the pilot valve.
Air Supply
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 cause malufunction 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 gases, etc., as it
can cause damage or malfunction.
1. When extremely dry air is used as the fluid,
degradation of the lubrication properties inside 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
μ ｍ
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 of pneumatic equipment such as valves.
Therefore, take appropriate measures to ensure air quality,
such as by providing an aftercooler, air dryer, or water
separator.
4. If excessive carbon powder is seen, install a mist
separator on the upstream side of the valve.
If excessive carbon powder is generated by the compressor, it
may adhere to the inside of a valve and cause it to malfunction.
For
compressed air quality, refer to SMC’s Best Pneumatics
catalog.
Warning
Warning
Warning
Caution
VFR4000 Series
5 Port Solenoid Valve / Precautions 3
Be sure to read before handling.
Caution
Caution