SMC Networks VEX3 Series User manual

Doc. no. VEX-OMT0003
PRODUCT NAME
3 Position Valve with 3 Ports
MODEL/ Series/ Product Number
VEX3 series
(Mounted pilot valve: V100 / VO307)

VEX-OMT0003
Contents
Safety Instructions ------------------------------------------------------------------------------------- 2, 3
Design/Selection --------------------------------------------------------------------------------------- 4 to 6
Mounting ------------------------------------------------------------------------------------------------- 6
Piping ----------------------------------------------------------------------------------------------------- 6
Wiring ----------------------------------------------------------------------------------------------------- 7
Lubrication ----------------------------------------------------------------------------------------------- 7
Air Supply ------------------------------------------------------------------------------------------------ 7
Operating Environment ------------------------------------------------------------------------------- 8
Maintenance -------------------------------------------------------------------------------------------- 8
Specific Product Precautions ----------------------------------------------------------------------- 9 to 11
Replacement Parts List ------------------------------------------------------------------------------ 12
Troubleshooting --------------------------------------------------------------------------------------- 13
Countermeasures ------------------------------------------------------------------------------------- 14
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VEX-OMT0003
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 10218-1992: 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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VEX-OMT0003
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.
Avacuum 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 govemed 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 goveming that export
are known and followed.
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ollowed.
- 3 -

- 4 -
VEX-OMT0003
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 (cover installation or approach
prohibition) to prevent potential danger caused by actuator
operation.
3. Intermediate stops
Due to the compressibility of air, it is difficult for this product to
make a piston stop at the required intermediate position
accurately and precisely.
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 an
actuator may malfunction due to back-pressure.
5. Holding pressure (including vacuum)
Since the 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.
This product is 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.
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 vacuum
at all times. Failure to do so may result in foreign matter sticking
to the adsorption pad, or air leakage causing the workpiece to
drop.
9. Use of the VEX3 series solenoid type product
When using the VEX3 series solenoid type for the first time,
actuators may travel in an unexpected direction depending on the
switching position of the valve. Implement measures to prevent
any danger from occurring when operating the actuator.
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. Extended periods of continuous energization
• 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. This will likely adversely affect the
performance of the solenoid valve and any nearby peripheral
equipment. Therefore, when it is continuously energized for an
extended period of time or when the energized period per day is
longer than the de-energized period, use VEX3 air operated type
product. For pilot air operation, use a low-wattage type or
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.
• 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 by bare
hand during or after energization.
In particular, note that the temperature rise will be greater if the
product is energized for extended periods of time.
12. Do not disassemble the product or make any
modifications, including additional machining.
It may cause human injury and/or an accident.
VEX3 Series
3 position valve with 3 ports / Precautions (1)
Be sure to read before handling.

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VEX-OMT0003
Design/Selection
1. Leakage voltage
Take note that the leakage voltage will increase when a resistor is
used in parallel with switching element or a C-R circuit (surge
voltage suppressor) is used for protecting a switching device
because of the passing leakage voltage through the C-R circuit.
The suppressor residual leakage voltage should be as follows.
DC coil
3% or less of rated voltage
AC coil
●VEX3121, VEX3122, VEX3221, VEX3222
VEX3321, VEX3322, VEX3421, VEX3422
●VEX3501, VEX3701, VEX3901 } 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.
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) Solenoid valve with full wave rectifier circuit
When the solenoid valve built-in full wave rectifier circuit with
the AC specifications is used, the solenoid valve return failure
may occur depending on the kind of the triac output circuit.
Carefully check this point when selecting a SSR or sequencer.
For details, contact the SSR or sequencer manufacturer.
3. Surge voltage suppressor
1) A 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 electric circuit enters the short-circuit status by
the breakage. If the energizing continues in this status, a large
current flows. This may cause secondary damage to the output
circuit, external peripheral device, or valve, and may also cause
fire accident. So, take appropriate protective measures, such
as installation of an overcurrent protection circuit in the power
supply or drive circuit to maintain the sufficient safety.
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 1V.
4. Surge voltage intrusion
(For VEX3121, VEX3221, VEX3321, and VEX3421)
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 (power consumption),
and the solenoid valve in a deenergized 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).
8
% or
less of
rated voltage
Caution
VEX3 Series
3 position valve with 3 ports / Precautions (2)
Be sure to read before handling.

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VEX-OMT0003
Warning
Design/Selection
5. Operation in a low temperature condition
Take appropriate measures to avoid freezing of drainage,
moisture etc. in low temperature.
The minimum operating temperature for this product is 0
o
C.
6. Operation for air blowing
When using a solenoid valve for air blowing, use an external pilot
type.
Use caution because the pressure drop caused by the air blowing
can have an affect on the internal pilot type valve when the internal
pilot type valves and external pilot type valves are used on the
same manifold.
7. Mounting orientation
Mounting orientation is not specified.
8. 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.
3. Tighten threads with the proper tightening torque.
Wheninstalling 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 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. Wrapping of pipe 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 pipe tape is used, leave 1
thread ridge exposed at the end of
the threads.
3. After piping
Check the piping to prevent air leakage from the piping between the
valve and the cylinder.
4. Connection of pipings and fittings
When screwing the piping or fitting into the valve, tighten it as
follows.
1) When using SMC fitting, follow the procedures below to tighten it.
●M5
First, tighten by hand, then use a wrench appropriate for the
hexagon flats of the body to tighten an additional 1/6 to 1/4 turn.
A reference value for the tightening torque is 1 to 1.5 N·m.
Note) Excessive tightening may damage the thread portion or
deform the gasket and cause air leakage.
Insufficient tightening may loosen the threads, or cause
air leakage.
●When using a fitting other than SMC fitting, follow the
instructions given by relevant fitting manufacturer.
2) For the fitting with sealant R or NPT, first, tighten it by hand,
then use a wrench appropriate for the hexagon flats of the body
to tighten it a further two or three turns. For a tightening torque
guide, refer to the table below.
Connection thread size (R, NPT) Proper tightening torque (N·m)
1/8 3～5
1/4 8～12
3/8 15～20
1/2 20～25
3/4 28～30
1 36～38
1
1
/
4
40～42
1
1
/
2
48～50
2 48～50
3) If the fitting is tightened with excessive torque, a large amount of
sealant will seep out. Remove the excess sealant.
4) Insufficient tightening may cause seal failure, or loosen the
threads.
5. Piping to products
When piping to a product, refer to its instruction manual to avoid
connection of the air lines to the incorrect ports.
Caution Caution
VEX3 Series
3 position valve with 3 ports / Precautions (3)
Be sure to read before handling.

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VEX-OMT0003
Warning Warning
Warning
Wiring
The solenoid valve is an electrical product. For
safety, install an appropriate fuse and circuit breaker
before use.
1. Polarity
Whenconnecting powerto a solenoid valve with a DC specification
and equipped with a light or surge voltage suppressor, check for
polarity.
If a mistake is made regarding the polarity, damage may occur to
the diode in the valve, the switching element in a control device
or power supply equipment, etc.
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 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 20 N
or more is not applied to the lead wire.
Lubrication
1. Lubrication
1) The product has been lubricated by the manufacturer, and does
not require lubrication maintenance.
2) If a lubricant is used in the system, use class 1 turbine oil (no
additive), ISO VG32. For details about lubricant manufacturers’
brands, refer to 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.
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 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 This may cause 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 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. 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.
3. As a countermeasure, install an air filter and a
mist separator on the upstream side of the valve.
If the supply side pressure line contains drain or foreign matter,
the sliding resistance of the moving part will increase, resulting in
a malfunction. In addition, if excessive carbon dust is generated
by the compressor, it may adhere to the inside of the valve and
cause it to malfunction. To avoid the malfunction shown above,
install an air filter and a mist separator on the upstream side of
the valve.
For compressed air quality, refer to SMC Best Pneumatics catalog.
Caution
Caution
VEX3 Series
3 position valve with 3 ports / Precautions (4)
Be sure to read before handling.

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VEX-OMT0003
Warning
Warning
Operating Environment
1. Do not use in an atmosphere having 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 its energized for a long time, make sure
ambient temperature is within the specification
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, malfunction and damage of machinery
or equipment may occur.
2. Removal of equipment, and supply/exhaust of
compressed air
When equipment is 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 compressed air from the system using its residual pressure
release function.
For this product, exhaust the residual pressure between the valve
and the cylinder.
Whenthe equipment is operated after remounting or replacement,
first confirm that measures are in place to prevent 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 the manual override is operated, connected equipment will
be actuated.
Operate 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 of the valve to
confirm the operating condition, and if there is
any air leakage.
1. Drain flushing
Remove drainage from the air filters regularly. (Refer to the
specifications.)
2. Lubrication
Once lubrication has been started, it must be continued.
Use class 1 turbine oil (with no additive), VG32. If other lubricant
oil is used, it may cause malfunction. Please contact SMC for
suggested class 2 turbine oil (with additive), VG32.
Caution
Caution
VEX3 Series
3 position valve with 3 ports / Precautions (5)
Be sure to read before handling.

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VEX-OMT0003
VEX3 Series
Specific Product Precautions (1)
Be sure to read before handling.
Connectors for Series VEX3 Body Sizes 12, 22, 32, 42
How to Use Plug Connector
1. Attaching and detaching connectors
• To attach a connector, hold the lever and connector unit between
your fingers and insert straight onto the pins of the solenoid valve
so that the lever’s pawl is pushed into the groove and locks.
• To detach a connector, remove the pawl from the groove by pushing
the lever downward with your thumb, and pull the connector straight
out.
2. Crimping of lead wires and sockets
Strip 3.2 to 3.7 mm at the end of the lead wires, insert the ends of
the core wires evenly into the sockets, and then crimp with a
crimping tool. When this is done, take care that the coverings of
the lead wires do not enter the core wire crimping area.
Use an exclusive crimping tool for crimping.
(Contact SMC for special crimping tools.)
3. Attaching and detaching sockets with lead wires
• Attaching
Insert the sockets into the square holes of the connector (+, –
indication), and continue to push the sockets all the way in until
they lock by hooking into the seats in the connector.
(When they are pushed in, their hooks open and they are locked
automatically.) Then confirm that they are locked by pulling lightly
on the lead wires.
• Detaching
To detach a socket from a connector, pull out the lead wire while
pressing the socket’s hook with a stick having a thin tip (approx. 1
mm). If the socket will be used again, first spread the hook outward.
Plug Connector Lead Wire Length
Standard length is 300 mm, but the following lengths are also
available.
How to Order Connector Assembly
For DC ：SY100-30-4A-
For 100 VAC ：SY100-30-1A-
For 200 VAC ：SY100-30-2A-
For other voltages of AC ：SY100-30-3A-
Without lead wire ：SY100-30-A
(with connector and 2 of sockets only)
How to Order
Include the connector assembly part
number together with the part number
for the plug connector’s solenoid valve
without connector.
Ex.) In case of 2000 mm of lead wire
For DC For AC
VEX3122-015LO1 VEX3122-011LO1
SY100-30-4A-20 SY100-30-1A-20
Connector Assembly with Cover
Connector assembly with dust proof protective cover.
• Effective to prevention of short circuit failure due to the entry of
foreign matter into the connector.
• Chloroprene rubber for electrical use, which provides outstanding
weather resistance and electrical insulation, is used for the cover
material. However, do not allow contact with cutting oil, etc.
• Simple and unencumbered appearance by adopting roundshaped
cord.
How to Order
SY100-68-A-
Connector Assembly with Cover: Dimensions
How to Order
Enter the part number for a plug connector solenoid valve without
connector together with the part number for a connector assembly
with cover.
Ex.) Lead wire length of 2000 mm
VEX3122-015LO1
SY100-68-A-20
Caution

- 10 -
VEX-OMT0003
VEX3 Series
Specific Product Precautions (2)
Be sure to read before handling.
Connectors for Series VEX3 Body Sizes 12, 22, 32, 42
Surge Voltage Suppressor
For DC
Polarity (positive and negative) does not matter.
Grommet, L/M Plug Connector
DIN Terminal
For AC
• There is no “S” type because the generation of surge voltage is
prevented by a rectifier.
• Surge voltage suppressor of varistor has residual voltage
corresponding to the protective element and rated voltage;
therefore, protect the controller side from the surge. The residual
voltage of the diode is approximately 1 V.
Grommet, L/M Plug Connector
DIN Terminal
How to Use DIN Terminal
●Connection
1. Loosen the holding screw (1) and pull the connector out of the
solenoid valve terminal block.
2. After removing the holding screw (1), insert a flat head screwdriver,
etc. into the notch (2) on the bottom of the terminal block and pry
it open, separating the terminal block (2) and the housing.
3. Loosen the terminal screws (slotted screws) (4) on the terminal
block (2), insert the cores of the lead wires into the terminals
according to the connection method, and fasten them securely with
the terminal screws (4).
4. Secure the cord by fastening the ground nut (5).
∗When making connections, take note that using other than the
supported size (ø3.5 to ø7) heavy duty cord will not satisfy IP65
(enclosure) standards.
Also, be sure to tighten the ground nut (5) and holding screw (1)
within their specified torque ranges.
●Changing the entry direction
After separating the terminal block (2) and housing (3), the cord entry
can be changed by attaching the housing (3) in the desired direction
(4 directions at 90°intervals).
∗When equipped with a light, be careful not to damage the light
with the cord’s lead wires.
●Precautions
Plug in and pull out the connector vertically without tilting to one side.
●Compatible cable
Cord O.D.: ø 3.5 to ø 7
(Reference) 0.5 mm2, 2-core or 3-core, equivalent to JIS C 3306
●DIN Connector Part No.
・Without light：SY100-61-1
・With light
●Circuit Diagram with Light
Rated voltage Voltage symbol Part no.
24 VDC 24V SY100-61-3-05
12 VDC 12V SY100-61-3-06
100 VAC 100V SY100-61-2-01
200 VAC 200V SY100-61-2-02
110 VAC 110V SY100-61-2-03
220 VAC 220V SY100-61-2-04
ランプ・サージ
電圧保護回路付(□Z)
With light/surge voltage
suppressor (□Z)
With light/surge voltage
suppressor (□Z)
Terminal
no. 1
Terminal
no. 2
Terminal
no. 1
Terminal
no. 2
Caution Caution
Terminal
Terminal
Terminal
Terminal
(1)
(3)
(2)
(5)
(4)

- 11 -
VEX-OMT0003
VEX3 Series
Specific Product Precautions (3)
Be sure to read before handling.
Connectors for Series VEX3 Body Sizes 50, 70, 90
How to Use DIN Terminal
Disassembly
1) After loosening the screw (1), then if the housing (2) is pulled in
the direction of the screw (1), the connector will be removed from
the body of equipment (solenoid, etc.).
2) Pull the screw (1) out of the housing (2).
3) On the bottom part of the terminal block (3), there’s a cut-off part
(9). If a small flat head screwdriver is inserted between the
opening in the bottom, terminal block (3) will be removed from the
housing (2).
4) Remove the cable gland (4), plain washer (5) and rubber seal (6).
Wiring
1) Pass the cable (7) through the cable gland (4), plain washer (5)
and rubber seal (6) in this order, and then insert them into the
housing (2).
2) Loosen the screw (11) attached to the terminal block (3). Then,
pass the lead wire (10) through the terminal block (3) and tighten
the screw (11) again.
Note 1) Tighten within the tightening torque of 0.5 Nm ±15%.
Note 2) Cable (7) outside diameter: ø6 to ø8 mm
Note 3) Crimped terminal like round-shape or Y-shape cannot be
used.
Assembly
1) Pass the cable (7) through the cable gland (4), plain washer (5)
and rubber seal (6) in this order and connect to the terminal block
(3). Then, mount the terminal block (3) on the housing (2).
(Push it down until you hear the click sound.)
2) Put the rubber seal (6) and plain washer (5) in this order into the
cable entry of the housing (2), and then tighten the cable gland (4)
securely.
3) Insert the gasket (8) between the bottom part of terminal block (3)
and the plug attached to the equipment. Then, screw in (1) from
the top of the housing (2) to tighten it.
Note 1) Tighten within the tightening torque of 0.5 Nm ±20%.
Changing the entry direction
The orientation of a connector can be changed 180
o
,depending on
the combination of a housing (2) and a terminal block (3).
Connector for DIN Terminal
Electrical Connection(DIN Terminal)
DIN terminal is connected inside as in the figure below. Connect to
the corresponding power supply.
・Applicable cable O.D.
ø6 to ø8
Lead Wire Color (Grommet)
Light/Surge Voltage Suppressor
AC
DC
Description Part no.
DIN connector B1B09-2A (Standard)
GM209NJ-B17 (CE-compliant)
DIN terminal block
Terminal no. 1 2
DIN terminal ＋ －
Voltage Color
100 VAC Blue
200 VAC Red
DC Red (+), Black (–)
Others Gray
Caution Caution
Caution
Caution
（～）
（～）
Indicator light assembly
(DIN terminal: Yes, Grommet: No)
Indicator light assembly
(DIN terminal: Yes, Grommet: No)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(11)(9)
(10)

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VEX-OMT0003
Replacement Parts List
Note 1) For solenoid valve only.
Note 2) Refer to SMC catalog for pilot valve part numbers.
∗ Refer to page 9 to 11 for the connector part numbers.
∗ Screw tightening torque VO307K: 1.35 to 1.45 Nm
V11 □: 0.14 to 0.17 Nm
Parts for manifold
Description VVEX2 VVEX4
Blanking plate assembly
(with bracket and mounting
screws)
VEX1-17-3A VEX4-5-3A
Select the symbols from the table below for (1) and (2).
(1) Port size (2) Thread type
Symbol
Port size Symbol
Thread
type
VEX322□ VEX342□ Nil Rc
A 1/8 1/4 F G
B 1/4 3/8 N NPT
C - 1/2 T NPTF
Description VEX312□- VEX322□- VEX332□- VEX342□- VEX350□- VEX370□- VEX390□-
Bracket
(with bolt and washer)
VEX1-18-1A - - - VEX5-32A VEX7-32A VEX9-32A
Foot bracket
(with bolt and washer)
VEX1-18-2A - VEX3-32-2A - - - -
Silencer for pilot exhaust
port (PE)
AN120-M5 AN103-01 AN210-02
Sub plate
- VEX1-9-2 (1) (2) - VEX4-2A-1 (1) (2) - - -
Base gasket
- VEX1-11-2 - VEX4-4 - - -
Function plate between pilot
valve and cover (with gasket)
- - - - DXT152-14-1A
Pilot valve
Grommet
L-connector
M-connector
V114□-□□□□ VO307K-□□□1
DIN terminal V115□-□□□
01
02
01
02
02
03
04
02
03
04
10
12
14
20
04
06
10
Note 1)
4
5
Note 2)

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VEX-OMT0003
Troubleshooting
Foreign matter caught in the seat
Sealing failure
Incorrect wiring (1)
Fuse blown out and/or lead wire broken (2)
Incorrect contact at the contact and connection
(3)
Broken wire in the coil (4)
Failure phenomenon Possible causes
Operation failure The pilot valve does not switch. Incorrect voltage (7)
Foreign matter caught in the armature
Poppet valve does not switch
or switches late despite the
pilot valve switches.
Decrease in pilot pressure (5)
Swell of valve seal and/or piston seal (6)
Excessive lubrication (12)
Coil has burned out. High voltage or incorrect coil (7)
Directly exposed to water (8)
Air leakage from poppet valve
(Adsorption and vacuum
release cannot be performed)
Wear-out of the valve seal and/or piston seal
(9)
Lodging of foreign matter (5)
Poppet valve does not switch completely (6)
Increase in operating pressure (14)
Sealing failure of driving equipment such as vacuum pad
(10)
(4)
Foreign matter caught in the armature
Air leakage from joint Loosening of bolt (11)
Air leakage from the pilot
exhaust (P2) port Increase in pilot pressure (5)
Continuous buzzing sound is
generated when the power is
supplied.
(7)
Buzzing noise Wear-out of armature (4)
Foreign matter caught in the armature.
Decline in the power supply voltage (13)
AC voltage was applied to a DC pilot valve.
Countermeasures
（ Refer to the next page)

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VEX-OMT0003
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 ran e durin operation.
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 the replacin the valve, use turbine oil Class 1 (ISO VG32).
If there is a lar e amount of condensate or condensate cannot be removed completely, mount an auto drain
or install a dryer and replace the valve.
(7) Check the volta e and replace the valve.
(8) Protect the valve especially the coil to prevent it from bein exposed to water.
(9) If air leaka e is caused by forei n matter, remove forei n matter in the pipin by air blow and replace the valve.
(10) Repair or replace the actuators.
Stop the air and additionally ti hten the bolt. Check whether there is vibration or impact which has caused
the loosenin of the bolt. Install dampin rubber so that the product is not affected by the vibration and impact.
(12) Reduce the amount of lubrication to the amount at which the oil does not splash from the (pilot) exhaust port.
(13) Adjust the volta e so that volta e durin operation is within the specified ran e.
(14) Adjust the volta e so that the upstream pressure (vacuum pressure) becomes the required (vacuum) pressure.
1. Voltage was outside of the rated voltage.
2. Oils other than specified were supplied.
3. Lubrication was stopped in the middle of lubrication. Or, lubrication was interrupted temporarily.
4. Directly exposed to water
5. Severe impact was applied.
6. Foreign matter such as condensate or dust entered.
7. Other than the cases mentioned above, any usage which falls outside the precautions given in this
Operation Manual.
(6)
(11)
If the countermeasures above are not effective, there may be a problem with the valve.
Stop using the valve immediately.
If any of the examples below are applicable, there may be an internal problem with the valve.
Stop using the valve immediately.
∗If the product has failed, then please return the valve as it is.

Revision history
1st printing : TW
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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