SMC Networks VO317 Series User manual

Doc. no. VT317∗∗-OMH0002-B
PRODUCT NAME
3 Port Solenoid Valve
MODEL / Series / Product Number
VT/O317 Series

Contents
Safety Instructions ----------------------------------------------------------------------------------- 2,3
Design / Selection ----------------------------------------------------------------------------------- 4,5
Mounting ----------------------------------------------------------------------------------------------- 5
Piping --------------------------------------------------------------------------------------------------- 5
Wiring --------------------------------------------------------------------------------------------------- 5
Lubrication --------------------------------------------------------------------------------------------- 5
Air Supply ---------------------------------------------------------------------------------------------- 6
Operating Environment ----------------------------------------------------------------------------- 6
Maintenance ------------------------------------------------------------------------------------------- 6
Specific Product Precautions ---------------------------------------------------------------------- 7 to 9
Trouble shooting -------------------------------------------------------------------------------------- 10 ,11
-1-
VT317∗∗-OMH0002-B

Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or equipment damage.
These instructions indicate the level of potential hazard with the labels of “Caution,” “Warning” or “Danger.”
They are all important notes for safety and must be followed in addition to International Standards
(ISO/IEC)*1) , and other safety regulations.
*1) ISO 4414: Pneumatic fluid power -- General rules relating to systems.
ISO 4413: Hydraulic fluid power -- General rules relating to systems.
IEC 60204-1: Safety of machinery -- Electrical equipment of machines .(Part 1: General requirements)
ISO 10218: Manipulating industrial robots -Safety.
etc.
Caution
Caution indicates a hazard with a low level of risk which, if not avoided, could result
in minor or moderate injury.
Warning
Warning
indicates a hazard with a medium level of risk which, if not avoided, could
result in death or serious injury.
Danger
Danger
indicates a hazard with a high level of risk which, if not avoided, will result
in death or serious injury.
Warning
1. The compatibility of the product is the responsibility of the person who designs the equipment or
decides its specifications.
Since the product specified here is used under various operating conditions, its compatibility with specific
equipment must be decided by the person who designs the equipment or decides its specifications based on
necessary analysis and test results.
The expected performance and safety assurance of the equipment will be the responsibility of the person who
has determined its compatibility with the product.
This person should also continuously review all specifications of the product referring to its latest catalog
information, with a view to giving due consideration to any possibility of equipment failure when configuring the
equipment.
2. Only personnel with appropriate training should operate machinery and equipment.
The product specified here may become unsafe if handled incorrectly.
The assembly, operation and maintenance of machines or equipment including our products must be
performed by an operator who is appropriately trained and experienced.
3. Do not service or attempt to remove product and machinery/equipment until safety is confirmed.
1.The inspection and maintenance of machinery/equipment should only be performed after measures to
prevent falling or runaway of the driven objects have been confirmed.
2.When the product is to be removed, confirm that the safety measures as mentioned above are implemented
and the power from any appropriate source is cut, and read and understand the specific product precautions
of all relevant products carefully.
3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.
4. Contact SMC beforehand and take special consideration of safety measures if the product is to
be used in any of the following conditions.
1. Conditions and environments outside of the given specifications, or use outdoors or in a place exposed to
direct sunlight.
2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping,
vehicles, military, medical treatment, combustion and recreation, or equipment in contact with food and
beverages, emergency stop circuits, clutch and brake circuits in press applications, safety equipment or
other applications unsuitable for the standard specifications described in the product catalog.
3. An application which could have negative effects on people, property, or animals requiring special safety
analysis.
4.Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a
mechanical protective function, and periodical checks to confirm proper operation.
-
2
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VT317∗∗-OMH0002-B

Safety Instructions
Caution
1. The product is provided for use in manufacturing industries.
The product herein described is basically provided for peaceful use in manufacturing industries.
If considering using the product in other industries, consult SMC
beforehand and exchange
specifications or a contract if necessary.
If anything is unclear, contact your nearest sales branch.
Limited warranty and Disclaimer/Compliance Requirements
The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance
Requirements”.
Read and accept them before using the product.
Limited warranty and Disclaimer
1.The warranty period of the product is 1 year in service or 1.5 years after the product is
delivered,whichever is first.
∗
2)
Also, the product may have specified durability, running distance or replacement parts. Please
consult your nearest sales branch.
2. For any failure or damage reported within the warranty period which is clearly our responsibility,
a replacement product or necessary parts will be provided.
This limited warranty applies only to our product independently, and not to any other damage
incurred due to the failure of the product.
3. Prior to using SMC products, please read and understand the warranty terms and disclaimers
noted in the specified catalog for the particular products.
∗
2) Vacuum pads are excluded from this 1 year warranty.
A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
Also, even within the warranty period, the wear of a product due to the use of the vacuum
pad or failure due to the deterioration of rubber material are not covered by the limited
warranty.
Compliance Requirements
1.
The use of SMC products with production equipment for the manufacture of weapons of mass
destruction(WMD) or any other weapon is strictly prohibited.
2. The exports of SMC products or technology from one country to another are governed by the
relevant
security laws and regulation of the countries involved in the transaction. Prior to the
shipment of a SMC product to another country, assure that all local rules governing that export
are known and f
ollowed.
Caution
SMC products are not intended for use as instruments for legal metrology.
Measurement instruments that SMC manufactures or sells have not been qualified by type approval tests
relevant to the metrology (measurement) laws of each country.
Therefore, SMC products cannot be used for business or certification ordained
by the metrology
(measurement) laws of each country.
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3
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VT317∗∗-OMH0002-B

Warning
Caution
Design/Selection
1.Confirm the specifications.
This product is designed only for use in compressed air
systems (including vacuum). Do not operate at pressures,
temperatures, etc., beyond the range of specifications, as this
can cause damage or malfunction.(Refer to the specifications.)
Please contact SMC when using a fluid other than compressed
air (including vacuum).
We do not guarantee against any damage if the product is
used outside of the specification range.
2.Actuator drive
When an actuator, such as a cylinder, is to be driven using a
valve, take appropriate measures (such as the installation of a
cover or the restricting of access to the product) to prevent
potential danger caused by actuator operation.
3. Effects of back pressure when using a manifold
Use caution when valves are used on a manifold because
actuators may malfunction due to back pressure.
Especially, when a single acting cylinder is operated, caution
is necessary. When there is a danger of such a malfunction,
take countermeasures such as using an individual EXH
manifold.
4.Holding pressure (including vacuum)
Since valves are subject to air leakage, they cannot be used
for applications such as holding pressure (including vacuum)
in a pressure vessel.
5.Not suitable for use as an emergency shutoff
valve, etc.
The valves presented in this catalog are not designed for
safety applications (e.g. emergency shutoff valve). If the valves
are used in such applications, additional safety measures
should be adopted.
6.Release of residual pressure
For maintenance and inspection purposes install a system for
releasing residual pressure.
7.Operation in a vacuum condition
When a valve is used for switching a vacuum, take measures
to install a suction filter or similar to prevent external dust or
other foreign matter from entering inside the valve.
supply a constant supply of vacuum. Failure to do so may
result in foreign matter sticking to the adsorption pad or air
leakage, causing the workpiece to drop.
8.Regarding vacuum switch valves and vacuum
release valves
If a non-vacuum valve is installed in the middle of a piping
system that contains a vacuum, the vacuum condition will not
be maintained. Use a valve designed for use under vacuum
conditions.
9.Ventilation
Provide ventilation when using a valve in a confined area,
such as in a closed control panel. For example, install a
ventilation opening, etc., in order to prevent pressure from
increasing inside of the confined area and to release the heat
generated by the valve.
10. Extended periods of continuous energization
Caution for high temperature
∗The surface temperature of the valve may increase.
●If a valve will be continuously energized for an extended period
of time, the temperature of the valve will increase due to the
heat generated by the coil assembly. This will likely adversely
affect the performance of the valve and any nearby peripheral
equipment. If the total energizing time per day is expected to
be longer than the total de-energizing time per day, use a
continuous duty type valve.
As a valve not mentioned above can also be used, depending
on the operating conditions (in particular, DC specification
valves) , please contact SMC for further information.
Also, it is possible to reduce the energizing time by using a
N.O. (normal open) valve.
●For applications such as mounting a valve on a control panel,
incorporate measure to limit the heat radiation so that it is
within the operating temperature range. Do not touch the
valves with bare hands during or after energization.
In particular, note that the temperature rise will be larger if three
or more adjacent valves on the manifold are energized together
for extended periods of time.
11.Do not disassemble the product or make any
modifications, including additional machining.
Doing so may cause human injury and/or an accident.
1.Leakage voltage
Take note that the leakage voltage will increase when a resistor
is used in parallel with a switching element or when a C-R circuit
(surge voltage suppressor) is used for protecting a switching
device because of the leakage voltage passing through the C-R
circuit. The suppressor residual leakage voltage should be as
follows.
DC coil 2% or less of the rated voltage
AC coil 20% or less of the rated voltage
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
1) The surge voltage suppressor built into the valve is intended
to protect the output contacts so that the surge generated
inside valve does not adversely affect the output contacts.
Therefore, if an overvoltage or overcurrent is received from
an external peripheral device, the surge voltage protection
element inside the valve is overloaded, causing the
element to break. In the worst case, the breakage causes
the electric circuit to enter short-circuit status. If energizing
continues while in this state, a large current flows. This may
cause secondary damage to the output circuit, external
peripheral device, or valve, and may also cause a fire. So,
take appropriate protective measures, such as the
installation of an overcurrent protection circuit in the power
supply or a drive circuit to maintain a sufficient level of
safety.
VT317 Series
3 port solenoid valve/ Precautions (1)
Be sure to read this before handling the products.
- 4 - VT317∗∗-OMH0002-B

Warning
Caution
Warning
Caution
Warning
Caution
Design/Selection
2) 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.
4.Operation in low temperature conditions
It is possible to operate a valve in extreme temperatures, as
low as –10°C. Take appropriate measures to avoid the
freezing of drainage, moisture, etc., in low temperatures.
5.Mounting orientation
Mounting orientation is not specified.
6.Initial lubrication of main valve
Grease has been applied to the main valve as initial lubricant.
Mounting
1.Operation Manual (this copy)
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
and inspection.
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
performed after installation.
5.Painting and coating
Warnings or specifications printed on 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.Winding of sealant 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 sealant tape is used,
leave 1 thread ridge exposed at
the end of the threads.
3.Connection of fittings
For a fitting with sealant R or NPT, first, tighten it by hand,
then use a suitable wrench to tighten the hexagonal portion
of the body an additional two or three turns.
For the tightening torque, refer to the table below.
Connection thread size
(R, NPT)
Proper tightening torque
(N·m)
1/8
3 to 5
1/4
8 to 12
4.Piping to products
When connecting piping to the product, refer to the catalog to
avoid mistakes in the position of the supply port, etc.
This product is universal porting type. N.C type, N.O. type,
divider type and selector type can be used.
Wiring
1.The solenoid valve is an electrical product.
For safety, install an appropriate fuse and
circuit breaker before use.
1.Polarity
When power is supplied to the valves, other than the non-polar
type in the DC specification, pay attention to the 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.
Lubrication
1.Lubrication
1) The valve has been lubricated for life by the factory and
does not require any further lubrication.
2) If a lubricant is used in the system, use class 1 turbine oil
(no additives), ISO VG32. For details about lubricant
manufacturers’ brands, refer to the SMC website. Additionally,
please contact SMC for details about class 2 turbine oil
(with additives) ISO VG32. Once lubricant is utilized within
the system, since the original lubricant applied within the
product during manufacturing will be washed away, please
continue to supply lubrication to the system. Without
continued lubrication, malfunctions could occur.
If turbine oil is used, refer to the Safety Data Sheet (SDS) of
the oil.
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.
VT317 Series
3 port solenoid valve/ Precautions (2)
Be sure to read this before handling the products.
- 5 - VT317∗∗-OMH0002-B

Warning
Caution
Warning
Caution
Warning
Caution
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 the 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. This may cause the malfunction
of pneumatic equipment.
If the drain bowl is difficult to check and remove, the installation
of a drain bowl with an auto drain option is recommended.
For compressed air quality, refer to the SMC Best Pneumatics
catalog.
4.Use clean air.
Do not use compressed air that contains chemicals, synthetic
oils that include organic solvents, salt, 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 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 the 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 an excessive amount of carbon powder is
present, install a mist separator on the
upstream side of the valve.
If excessive carbon dust 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 the SMC Best Pneumatics
catalog.
Operating Environment
1.Do not use in an atmosphere containing corrosive
gases, chemicals, sea water, water, water steam,
or where there is direct contact with any of these.
2.Do not use in an environment where flammable
gas or explosive gas exists. Usage may cause
a fire or explosion. The products do not have
an explosion proof construction.
3.Do not use in a place subject to heavy vibration
and/or shock.
4.The valve should not be exposed to prolonged
sunlight. Use a protective cover. Note that the
valve is not for outdoor use.
5.Remove any sources of excessive heat.
6.If it is used in an environment where there is
possible contact with oil, weld spatter, etc.,
exercise preventive measures.
7. When the solenoid valve is mounted in a control
panel or it’s energized for a long period of time,
make sure the ambient temperature is within the
specifications of the valve.
1.Temperature of ambient environment
Use the valve within the range of the ambient temperature
specification of each valve. In addition, pay attention when
using the valve in environments where the temperature
changes drastically.
2.Humidity of ambient environment
When using the valve in environments with low humidity,
take measures to prevent static.
If the humidity rises, take measures to prevent the adhesion
of water droplets on the valve.
Maintenance
1.Maintenance should be performed according
to the procedure indicated in the Operation
Manual (this copy).
If handled improperly, human injury and/or malfunction or
damage of machinery and equipment may occur.
2.Removal of equipment, and supply/exhaust of
compressed air
Before components are removed, first confirm that measures
are in place to prevent workpieces from dropping, run-away
equipment, etc. Then, cut off the supply air and electric power,
and exhaust all air pressure from the system using the
residual pressure release function.
When the equipment is operated after remounting or
replacement, first confirm that measures are in place to
prevent the lurching of actuators, etc. Then, confirm that the
equipment is operating normally.
3.Low-frequency operation
Valves should be operated at least once every 30 days to
prevent malfunction. (Use caution regarding the air supply.)
4.Manual override
When a manual override is operated, connected equipment
will be actuated.
Operate only after safety is confirmed.
5.If the volume of air leakage increases or the
valve does not operate normally, do not use
the valve.
Perform periodic maintenance on the valve to
confirm the operating condition and check for
any air leakage.
1.Drain flushing
Remove drainage from the air filters regularly.
2.Lubrication
Once lubrication has been started, it must be continued.
Use class 1 turbine oil (with no additives), VG32. If other
lubricant oil is used, it may cause a malfunction. Please
contact SMC for information on the suggested class 2 turbine
oil (with additives), VG32.
VT317 Series
3 port solenoid valve/ Precautions (3)
Be sure to read this before handling the products.
- 6 - VT317∗∗-OMH0002-B

Continuous duty type: VT317E
This product can be used for an extended period of time.
1. This model is for continuous duty, not for high cycle rates.
But even in low cycle rates, if energizing the valve more
than once a day, please consult with SMC.
2. Energizing solenoid should be done at least once in 30
days.
Vacuum spec. type: VT317V
This vacuum model has less air leakage than the standard
model under low pressure.
1. Since this valve has slight air leakage, it cannot be used for
vacuum holding (including positive pressure holding) in the
pressure container.
If the product is used in an environment where it is exposed
to dust, install a filter to prevent dust from entering the valve.
Specifications different from standardare as follows.
Operating pressure range
–101.2 kPa to 0.1 MPa
Bleed port
1. A bleed port for the main valve is located at the bottom of
the solenoid valve. Since blocking it causes malfunction, do
not block it.
∗Ordinarily, when the solenoid valve is mounted on a metal
surface, it can breathe through the breather hole, via the
breather groove. However, in particular, if the surface to be
mounted is made of the rubber, the rubber could deform and
block the hole.
2. Make sure that dust and/or other foreign materials should
not enter the valve from the unused port (e.g. exhaust port).
Also, since there is a bleed port for the armature in the
manual override, do not allow accumulation of dust and/or
other foreign materials to block bleed port.
Change of Electrical Entry Angle
1. The VT317 series can change
electrical entry angle.(4 directions
by 90°)
2. How to change: Loosen the nut
(1), remove the coil (2) from the
body assembly (3), place the
positioning pin (4) at the required
place, put back the coil (2) to its
place, and tighten sufficiently
with lock nut (1).
Light/Surge Voltage Suppressor
Protection circuit for light/surge voltage suppressor is not the
polarity type.
Lead Wire Color (Grommet)
Voltage
Color
100 VAC
Blue
200 VAC
Red
DC
Red (+), Black (–)
Other
Gray
Electrical Connection
DIN terminal is connected inside as in the figure below.
Connect to the corresponding power supply.
Caution
Caution
Caution
Caution
Caution
Caution
Caution
Specific Product Precautions (1)
Be sure to read this before handling the products.
- 7 -
VT317∗∗-OMH0002-B

How to wire DIN terminal
1.Disassembly
1) After loosening the screw (1), then if the housing (4) is pulled
in the direction of the screw (1), the connector will be
removed from the body of equipment (solenoid, etc.).
2)Pull out the screw (1), then remove the gasket (2) .
3)On the bottom part of the terminal block (3), there’s a cut-off
part (indication of an arrow) (3a). If a small flat head
screwdriver is inserted between the opening in the bottom,
terminal block (3) will be removed from the housing (4).
(Refer to graph at right.)
4)Remove the cable gland (5) and plain washer (6) and rubber
seal (7).
2.Wiring
1)Pass the cable (8) through the cable gland (5), washer (6),
rubber seal (7), in this order and then insert them into the
housing (4).
2)Dimensions of the cable (8) are as shown in the right figure.
Skin the cable and crimp the crimped terminal (9) to the
edges.
3)Remove the screw (3f) from the bracket (3e). (Loosen in the
case of Y-shape type terminal.) As shown in the right figure,
mount a crimped terminal (9), and then again tighten the
screw (3f).
Note) Tighten within the tightening torque of 0.5 N·m ±15%.
Note: a) It is possible to wire even in the state of bare wire. In
that case, loosen the screw (3f) and place a lead wire
into the bracket (3d), and then tighten it once again.
b) The maximum size for the round terminal (9) is 1.25
mm2－3.5 and for the Y terminal is 1.25 mm2－4.
c) Cable (8) outside diameter: ø6 to ø12 mm
Note) For the one with outside diameter ranged between ø9 to
ø12 remove the inside parts of the rubber seal (7) before
using.
3.Assembly
1)Terminal block (3) connected with housing (4) should be
reinstated. (Push it down until you hear the click sound.)
2)Putting rubber seal (7), plain washer (6), in this order into the
cable introducing slit on the housing (4), then further tighten
the cable gland (5) securely.
3)By inserting gasket (2) between the bottom part of the
terminal block (3) and a plug on an equipment, screw in (1)
on top of the housing (4) and tighten it.
Note) Tighten within the tightening torque of 0.5 N·m ±20%.
Changing the entry direction
The cable entry direction of a connector can be changed as
desired (4 directions at 90° intervals), depending on the
combination of a housing (4) and a terminal block (3).
Maintenance parts
Refer to SMC catalog for the part No. of the coil assembly and
DIN terminal connector.
When the rated voltage is AC and if it is assembled with the coil
for DC, response may be delayed and occur malfunction. Also, for
DC valves, when the coil for AC is assembled, it occurs
malfunction.
Pay attention that the coil is assembled correctly after performing
maintenance for the coil.
Exploded view
Caution
Specific Product Precautions (2)
Be sure to read this before handling the products.
- 8 -
VT317∗∗-OMH0002-B

Warning
Manifold
Mounting
1. When mounting valves on the manifold
base, the mounting orientation is
decided. If it is mounted in the wrong
direction, connected equipment may
malfunction. Mount it by referring to
how to switch over from N.C. to N.O.
specifications.
1. Each valve is fixed to the manifold
base with two M4 mounting screws.
Tighten the screws evenly when
re-mounting.
Tightening torque of the mounting
screw (M4): 1.4 N·m
2. For mounting, tighten M4 or equivalent
screws evenly into the mounting holes
of the manifold base.
Changing from N.C. to N.O.
Universal porting permits convertibility N.C./N.O. by a simple 180 degree rotation.
Mounting conditions for N.C. and N.O. is indicated as below figure.
∗ Changing from N.C. to N.O.
This product is delivered as N.C. valve. If N.O. valve is needed, remove mounting
screws of the required valve and turn the valve at 180Odegrees. (Make sure that there
are O-rings fixed on 4 positions of the valve surface.) Then, tighten the mounting
screws to fix the valve to the manifold base.
N.C. N.O.
Common exhaust
Individual exhaust
Exhaust port type
Valve
Caution
Caution
Specific Product Precautions (3)
Be sure to read this before handling the products.
- 9 -
VT317∗∗-OMH0002-B

Troubleshooting
(10)
Foreign matter caught in the armature
Insufficient tightening of the bolt
Foreign matter caught in the gap between
the gasket and mounting surface
(4)
Decline in the power supply voltage
(13)
(14)
Wear-out of armature
Perform troubleshooting with higher possibility based on the failure phenomenon.
(4)
(9)
(11)
Failure phenomenon
Possible causes
Operation failure
Incorrect wiring
(1)
Fuse blown out and/or lead wire broken
(2),(4)
Countermeasures
(12)
Coil has burned out.
High voltage or incorrect coil
(7)
Incorrect contact at the contact and connection
(3)
Broken wire in the coil
Foreign matter caught in the armature
Buzzing noise
Air leakage from the gap
between the valve and manifold
base
Continuous buzzing sound is
generated when the power is
supplied.
(5)
Directly exposed to water
(8)
Sealing failure
Wear of the spool seal
Lodging of foreign matter
Sealing failure of actuators (such as cylinder)
(2),(4)
(4)
Air leakage from the main valve
air exhaust [3 (R) port].
*For N.O. specification, from
[1(P) port].
The valve does not perform the
switching operation.
(Refer to the next page)
Incomplete switch of spool valve
(6)
Swelling, sliding failure or sticking of the spool valve.
(6)
Excessive lubrication
- 10 - VT317∗∗-OMH0001-B

Countermeasures
No.
Countermeasures
(1)
Connect wires correctly.
(2)
Replace the parts.
(3)
Replace the parts or connect wires correctly.
(4)
Replace the valve.
(5)
Adjust the pressure so that pilot pressure is within the specified range during operation.
(8)
Protect the valve especially the coil to prevent it from being exposed to water.
(6)
・If incorrect oil has been used for lubrication, remove the oil with air blow, and replace the valve
with a new one.
If a lubricant is used in the system after replacing the valve, use turbine oil Class 1 (with no additive)
ISO VG32.
・If there is a large amount of condensate or condensate cannot be removed completely, mount an
auto drain or install a dryer and replace the valve.
(7)
Check the voltage and replace the valve.
(9)
If air leakage is caused by foreign matter, remove foreign matter in the piping by air blow and
replace the valve.
(10)
Repair or replace the actuators.
If the countermeasures above are not effective, there may be a problem with the valve. Stop using the valve
immediately.
(13)
Adjust the voltage so that voltage during operation will satisfy the specification.
If any of the examples below are applicable, there may be an internal problem with the valve. Stop using the
valve immediately.
(11)
Stop the air and additionally tighten the bolt.
(12)
Reduce the amount of lubrication to the amount at which the oil does not splash from the exhaust
port [3(R) port].
(14)
Remove foreign matter.
7. Other than those specified, if precautions on the operation manual apply.
∗If the product has failed, then please return the valve as it is.
1. The voltage used was not the rated voltage.
2. The oil supplied was not the specified type.
3. Lubrication was stopped during operation or lubrication was interrupted temporarily.
4. The product was directly exposed to water.
5. Severe impact was applied.
6. Foreign matter such as condensate or dust has entered the product.
- 11 - VT317∗∗-OMH0001-B

Revision history
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Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
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VT317∗∗-OMH0002-B