SMC Corporation VT315 User manual

Doc. No.VT315∗∗-OMH0002-C
PRODUCT NAME
Direct Operated 3-port solenoid valve
MODEL/ Series
Series: VT315

Contents
Safety Instructions --------------------------------------------------------------------------- 2,3
Precautions on Design / Selection ------------------------------------------------------- 4,5
Mounting ---------------------------------------------------------------------------------------- 5
Piping -------------------------------------------------------------------------------------------- 5
Wiring -------------------------------------------------------------------------------------------- 6
Lubrication -------------------------------------------------------------------------------------- 6
Air Supply --------------------------------------------------------------------------------------- 6
Operating Environment ---------------------------------------------------------------------- 6,7
Maintenance ------------------------------------------------------------------------------------ 7
Specific Product Precautions --------------------------------------------------------------- 8～10
Trouble shooting ------------------------------------------------------------------------------- 11,12
-1-
VT315∗∗-OMH0002-C

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.
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VT315∗∗-OMH0002-C

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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VT315∗∗-OMH0002-C

Warning
Design / Selection
1. Confirm the specifications
This product is designed only for use in compressed air
systems (including vacuum).
Do not operate at pressures or 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. Intermediate stopping
It is difficult to make a piston stop at the required position
accurately due to the compressibility of air.
Furthermore, since valves and cylinders are not guaranteed for
zero air leakage, it may not be possible to hold a stopped
position for an extended period of time.
Please contact SMC if it is necessary to hold a stopped
position for an extended period of time.
4. Effect 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 malfunction, take
countermeasures such as using an individual exhaust manifold.
5. 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.
6. Not suitable for use as an emergency shutoff
valve, etc.
These valves are not designed for safety applications such as
an emergency shutoff valve. If the valves are used for the
mentioned applications, additional safety measures should be
adopted.
7. Release of residual pressure
For maintenance purposes install a system for releasing
residual pressure.
Especially, ensure that the residual pressure between the
valve and the cylinder is released.
8. 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.
In addition, at the time of vacuum adsorption, be sure to 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.
9. Regarding a vacuum switch valve 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.
10. 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.
11. Energizing for extended periods of time
Caution hot surface
∗ Be aware that the valve surface may get hot.
●If a valve is continuously energized for an extended period of
time, the temperature of the valve will increase due to the heat
generated by the coil. This will likely adversersly affect the
performance of the solenoid valve and any nearby peripheral
equipment. Therefore, when 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.
Depending on the operating conditions, it may be possible to
use valves which are not mentioned above. Please contact
SMC. In addition, it is possible to shorten the energizing time
by using a N.O. (normal open) valve.
●When the valve is mounted onto a control panel, incorporate
measures to limit the heat radiation so that it is within the
operating temperature range. Do not touch the valves by bare
hand during or after energization.
For example, the temperature will be high when a 3 station
manifold or larger is put next to other valves and continuously
energised.
12. 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 5% or less of rated voltage
AC coil 15% or less of 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.
VT315 Series
3 port solenoid valve/ Precautions (1)
Be sure to read before handling.
Caution
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VT315∗∗-OMH0002-C

Warning
Design / Selection
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
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. 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 (powerconsumption),
and a 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 (with polarity
protection diode), or install a surge absorption diode between
the loading equipment COM line and the output equipment COM
line (see Figure 2).
5. Operation in low temperature conditions
It is possible to operate this valve in extreme temperature, as
low as –5°C. Take appropriate measures to avoid the freezing
of drainage, moisture, etc., in low temperatures.
6. Mounting orientation
Mounting orientation is unrestricted.
7. Initial lubrication of main valve
The following initial lubricant has already been applied to the
main valve.
Mounting
1. Operation Manual (this document)
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
When screwing fittings into valves, tighten as follows.
Tightening Torque for Piping
Connection thread
Proper tightening torque (N･m)
Rc1/4
12 to 14
Rc3/8
22 to 24
Follow the procedure of the manufacturer when fittings other
than SMC is used.
4. Piping to products
When piping to a product, refer to the instruction manual to
avoid mistakes regarding the supply port, etc.
This product is universal porting type. N.C type, N.O. type, devider
type and selector type can be used.
Caution
Caution
VT315 Series
3 port solenoid valve/ Precautions (2)
Be sure to read before handling.
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VT315**-OMH0002-C

Warning
Warning
Warning
Warning
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 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 product has been lubricated for life by the manufacturer
and therefore, does not require lubrication while in service.
2) If a lubricant is used in the system, use class 1 turbine oil (no
additives), ISO VG32.
Once a lubricant is used in the system, lubrication must be
continued because the original lubricant applied during
manufacture will be washed away.
If turbine oil is used, refer to the Safety Data Sheet (SDS) of
the oil.
2. Lubrication amount
If too much oil is supplied, the oil will be accumulated in the
product, causing malfunction or response delay.
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 detailed information regarding the quality of the compressed
air described above, refer to SMC's 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 ㎛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 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 detailed information regarding the quality of the compressed
air described above, refer to SMC's 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.
5. Remove any sources of excessive heat.
6. If it is used in an environment where there is
possible contact with oil, weld spatter, et.,
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.
VT315 Series
3 port solenoid valve/ Precautions (3)
Be sure to read before handling.
Caution
Caution
- 6 -
VT315**-OMH0002-C

Caution
Caution
Warning
Operating Environment
(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. Perform maintenance inspection according to
the procedures indicated in the operation
manual (this document).
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.
VT315 Series
3 port solenoid valve/ Precautions (4)
Be sure to read before handling.
- 7 -
VT315**-OMH0002-C

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).
Electric connection (DIN terminal)
If the rated voltage for the solenoid valve is DC type and there is
polarity, connect terminal No.1 to the positive (+) side and No.2 to
the negative (-) side.
Connector for DIN Terminal
Description
Part no.
DIN connector
GDM2B
Exploded view
VT315 Series
3 port solenoid valve
Specific Product Precautions (1)
Be sure to read this before handling.
- 8 -
VT315∗∗-OMH0002-C

Breathing port
1. The bottom of the solenoid valve has a breathing hole for the
main valve. Take proper measures to prevent this hole from
being blocked as this may lead to malfunction.
∗If the solenoid valve is mounted on a metal surface, it can
breathe through the breathing hole. However, if the valve is
to be mounted on a surface made of rubber, it could
deform and block the breathing hole.
2. Make sure that dust and/or other foreign matters should not
enter the solenoid valve from the unused port such as the
exhaust port.
Also, since there is the breathing port for the armature on the
manual override, do not allow accumulation of dust and/or
other foreign matters to block the breathing port.
Lead wire color (grommet, conduit terminal)
Voltage
Color
100 VAC
Blue
200 VAC
Red
DC
（
With surge voltage suppressor)
Red
（＋）
,Black
（－）
Other
Gray
∗The DC type without the surge voltage suppressor does not have
polarity.
Semi-standard
1. Continuous duty type [VT/O 315E]
Exclusive use recommended for continuous energizing
for an extended period of time.
1) This model is for continuous energizing for an extended period of
time, not for high operating frequency. But even at low operating
frequency, if energizing the solenoid valve more than once a day,
consult with SMC.
2) Energizing the solenoid valve should be done at least once in 30
days.
Apparent power
Holding
：
18VA
（
50Hz
）
Coil rated voltage (V)
AC
（
50/60Hz
）
100, 110, 200, 220
DC
12, 24
2. Vacuum type [VT/O 315V]
Operating pressure range
-101.2kPa to 0.1MPa
The vacuum model has less air leakage than the
standard model under low pressure. It is recommended
for vacuum application.
Since the valves are subject to air leakage, they cannot be used for
applications such as holding pressure (including vacuum) in a
pressure vessel.
If the product is used in an environment where it is exposed to
dust, install a filter to prevent dust from entering the valve.
Light/Surge voltage suppressor
Manual override with lock (option)
1) Using a flat blade screwdriver, press the manual override
button that is located in the head portion of the solenoid valve
in order to directly push the spool valve downward, thus
causing the solenoid valve to switch.
2) With the button remaining pressed down, turn it approximately
90° clockwise or counterclockwise to maintain the manual
override locked state.
3) To revert to the original state, keep the button pressed down
and turn it approximately 90° clockwise.
Caution
Caution
Grommet type
Surge voltage suppressor
VT315 Series
3 port solenoid valve
Specific Product Precautions (2)
Be sure to read this before handling.
Bottom of the solenoid valve
Manual override
Breathing groove
Breathing port
on main valve
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VT315∗∗-OMH0002-C

Warning
Manifold specifications
Manifold
1) For more than 6 stations, supply air to both sides of P port. The
common exhaust type should exhaust from both of the R port.
2) The mounting bracket can change the P and R port (only P
port for the individual exhaust type) to 3/8".The common
exhaust type needs a specific base.
Accessory for manifold applicable solenoid Valve
[VO315]
Description
Part no.
Qty
O-ring
KA00087 (P8)
4
Screw
DXT010-66-2
2
Option
Description
Part no.
Note
Mounting bracket
DXT010-37-4
□
A
Common exhaust type
DXT010-37-3
□
A
Individual exhaust type
Blanking plate
(with O-ring and screws)
DXT010-36-2A
Common exhaust type
Individual exhaust type
□：Thread type (Refer to catalog “How to order”.)
Mounting
When the solenoid valves are mounted 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. .
The solenoid valves are assembled as N.C. valves at the time of
shipment.
By removing the two mounting screws from the desired valves,
and rotating each valve body 180° and reassembling it on the
manifold base, it is possible to reassemble an N.C. valve as an
N.O. valve. (When doing so, make sure that the gasket is
attached to the mounting surface of the valve.) Properly tighten
the screws.
The tightening torque of the mounting screws is 3 N·m.
How to switch over from N.C. to N.O.
Universal porting permits convertibility N.C/N.O. by a simple 180o
rotation.
Mounting conditions for N.C. and N.O. are shown in the figure
below.
Caution
Common exhaust
Individual exhaust
VT315 Series
3 port solenoid valve
Specific Product Precautions (3)
Be sure to read this before handling.
- 10 -
VT315∗∗-OMH0002-C

Air leakage from the air
exhaust port [3(R)port] of the
main valve.
* For N.O. specification, from
[1(P) port].
Open coil wire
④
Swollen spool valve
⑤
Failure due to
buzzing sound
（For AC）
Foreign matter caught in the gap between the
gasket and mounting surface
Worn core
Low line voltage
⑫
④
Tightening failure of mounting screw
⑧
Foreign matter caught in core of solenoid valve
Wear of packings of the spool valve
⑩
Leakage at manual override
⑬
Incomplete switch of spool valve
Intrusion of foreign matter
Coil splashed by water, etc.
⑦
⑤⑧
Leakage at actuator (cylinder, etc.) side
⑨
Over voltage or incorrect coil
⑥
Foreign matter caught in the spool valve
Excessive oil supply
⑧
⑪
Measures
Faulty wiring
①
Blown fuse or disconnection lead wire
②
Poor contact at contactor wire or connection part
③
Should any trouble be found during operation, trace the source of the trouble in the following order and take corrective action.
A big continuous buzzing
sound is emitted when the
power is turned on
Faulty operation
Sealing failure
Valve is not operated
Burned coil
Trouble phenomenon
Cause expected
(For manifold)
Leakage between manifold
base and solenoid valve body
(following page)
TROUBLE SHOOTING
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VT315∗∗-OMH0002-C

Remedy
7. Prohibited way of using the valve which is written at "Precautions" section in this operation manual
In addition, in the case of trouble, please send it back to the supplier for repair or replacement.
⑬
Remove foreign matter.
1. Voltage out of rated voltage has been used.
2. Oil other than the specified one has been lubricated.
3. Lubrication has been stopped intermediately, or lubrication was suspended temporary.
4. Water splashed directely.
5. Strong impact was given.
6. Alien substance such as drain and particle got into. Drain or garbage invaded a valve.
⑨
⑧
If no improvement is achieved in spite of the above countermeasure, inside of the valve may have
some abnormality. In this case, stop using the valve immediately.
Reduce the supply oil to the amount at which the oil does not splash from the exhaust port (R port).
Regulate voltage so that the voltage at the time of the operation becomes specifications range.
If any of followings are carried out, inside of the valve may have some failure. In this case, stop using
the valve immediately.
⑩
⑫
⑪
Check voltage. Replace valve.
No.
①
⑦
⑥
⑤
④
②
③
Protect the valve so that water does not splash the coil. Replace valve.
In case of intrusion of foreign matter, to remove foreign matter by air blow of piping and then replace valve.
Repair or replace actuators.
After stopping air and re-tighten the bolts.
Remedy
Re-wire correctly.
Replace part.
Replace part or re-wire positively.
Replace valve.
･If wrong oil is used, completely air blow to remove oil, and replace valve. After valve is replaced, use turbine
oil class 1 (ISO VG32).
･When a large quantity of drain is given and cannot carry out drain omission surely, install either an auto-drain
or a dryer.The valve should be replaced.
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VT315∗∗-OMH0002-C

S
Revision history
□
AE ARenewal NU
A□ BE ASafety Instructions Po
A□ CE ASafety Instructions VX
1st printing: 1988.4
4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN
Tel: + 81 3 5207 8249 Fax: [phone]
URL http://www.smcworld.com
Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
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VT315∗∗-OMH0002-C