SMC DXT1215 High Speed Pilot Operated Solenoid Valve

Contents

• Safety Instructions (Pages 2-3)
• Design/Selection (Pages 4-5)
• Mounting (Page 5)
• Piping (Page 5)
• Wiring (Page 6)
• Lubrication (Page 6)
• Air Supply (Page 6)
• Operating Environment (Page 7)
• Maintenance (Page 7)
• Specific Product Precautions (Page 8)
• Valve Construction (Page 9)
• Trouble shooting (Pages 10-11)

Safety Instructions

These safety instructions are intended to prevent hazardous situations and/or equipment damage. They indicate the level of potential hazard with the labels of "Caution," "Warning," or "Danger." All are 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: Indicates a hazard with a low level of risk which, if not avoided, could result in minor or moderate injury.

Warning: Indicates a hazard with a medium level of risk which, if not avoided, could result in death or serious injury.

Danger: Indicates a hazard with a high level of risk which, if not avoided, will result in death or serious injury.

[!] Warning:

1. Compatibility Responsibility: The compatibility of the product is the responsibility of the person who designs the equipment or decides its specifications. Since the product is used under various operating conditions, its compatibility with specific equipment must be decided 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. This person should continuously review product specifications and consider any possibility of equipment failure.

2. Qualified Personnel: Only personnel with appropriate training should operate machinery and equipment. The product may become unsafe if handled incorrectly. Assembly, operation, and maintenance must be performed by an appropriately trained and experienced operator.

3. Service Safety: Do not service or attempt to remove product and machinery/equipment until safety is confirmed. Inspection and maintenance should only be performed after measures to prevent falling or runaway of driven objects are confirmed. Before restarting machinery/equipment, take measures to prevent unexpected operation and malfunction.

4. Special Conditions: Contact SMC beforehand and take special consideration of safety measures if the product is to be used in any of the following conditions:

   • Conditions and environments outside of given specifications, or use outdoors or in a place exposed to direct sunlight.
   • 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 standard specifications.
   • An application which could have negative effects on people, property, or animals requiring special safety analysis.
   • Use in an interlock circuit requiring double interlock for possible failure, using a mechanical protective function, and periodical checks to confirm proper operation.

[Caution] The product is provided for use in manufacturing industries and is basically for peaceful use. If considering use in other industries, consult SMC beforehand. 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 is 1 year in service or 1.5 years after delivery, whichever is first. Consult your nearest sales branch for specified durability, running distance, or replacement parts.
2. For failures or damage clearly the manufacturer's responsibility within the warranty period, a replacement product or necessary parts will be provided. This warranty applies only to the manufacturer's product independently, not to any other damage incurred due to product failure.
3. Prior to using SMC products, 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. Vacuum pads are consumable parts warranted for one year after delivery. Wear due to use or failure due to rubber deterioration are not covered.

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. Exports of SMC products or technology are governed by relevant security laws and regulations. Assure that all local rules governing export are known and followed prior to shipment to another country.

[Caution] SMC products are not intended for use as instruments for legal metrology. Measurement instruments have not been qualified by type approval tests relevant to metrology laws. Therefore, SMC products cannot be used for business or certification ordained by metrology laws.

Design/Selection

Precautions for DXT1215 Series 3-5-Port Solenoid Valves: Be sure to read this before handling products.

1. Confirm Specifications: Products are designed for compressed air systems. Do not operate beyond specified pressures or temperatures, as this can cause damage or malfunction. SMC does not guarantee against damage if the product is used outside the specification range.

2. Actuator Drive: When driving an actuator (e.g., cylinder), take appropriate measures (like installing a cover or restricting access) to prevent potential danger caused by actuator operation.

3. Holding Pressure: Since valves are subject to air leakage, they cannot be used for applications such as holding pressure in a pressure vessel.

4. Emergency Shutoff: These valves are not designed for safety applications like emergency shutoff. If used in such applications, additional safety measures should be adopted.

5. Release of Residual Pressure: Install a system for releasing residual pressure for maintenance and inspection purposes.

6. Ventilation: Provide ventilation when using a valve in a confined area (e.g., closed control panel) to prevent pressure buildup and release heat generated by the valve.

7. Extended Periods of Continuous Energization: Continuous energization can increase valve temperature, potentially affecting performance. For periods longer than 30 minutes at a time, or if daily energized time exceeds de-energized time, consider using a valve with specifications like 0.4 W or lower (e.g., SY series) or a valve with a power-saving circuit for pilot-operated types, or a continuous duty type (e.g., VK, VT series) for direct-operated types. Give priority to conflicting instructions in specific product precautions or ordering pages.

8. No Disassembly or Modification: Do not disassemble or modify the product, including additional machining, as this may cause human injury or accidents.

9. Resumption After Long Holding Time: After a long period of inactivity, there might be a delay in initial response time due to adhesion. Conducting several running-in cycles can resolve this.

[Caution] Leakage Voltage: Leakage voltage can increase when a resistor is used in parallel with a switching element or when a C-R circuit (surge voltage suppressor) is used. The suppressor residual leakage voltage should be kept below 3% of rated voltage.

[Diagram Description: A simple electrical circuit diagram shows a power supply connected to a switching element, which is in series with a solenoid (SOL). A resistor (R) is shown in parallel with the switching element, illustrating the concept of leakage voltage.]

[Caution] Valves with a Power-Saving Circuit (PWM Circuit Built-in Type): These valves use a PWM control circuit to reduce power consumption after initial power application (approx. 5 ms). Potential issues include the valve not turning ON (due to switching signal chattering or filter effects) or not turning OFF (if the photo coupler cannot turn OFF). Check operation with the customer's machine sufficiently when selecting the product.

[Caution] Surge Voltage Suppressor: The built-in suppressor protects output contacts from surges. If overvoltage or overcurrent is received from an external device, the suppressor element can break, potentially causing a short-circuit, secondary damage, or fire. Install appropriate protective measures like overcurrent protection. If a surge protection circuit uses nonstandard diodes (Zener, varistor), a residual voltage will remain. Consider controller surge voltage protection; for diodes, residual voltage is approximately 1V.

Mounting and Piping

Design/Selection Precautions (Continued):

1. Operation in Low Temperature Conditions: Valves can operate down to -10°C. Take measures to avoid freezing of drainage or moisture.

2. Operation for Air Blowing: Be cautious about pressure drop when using the valve for air blowing, as it may cause malfunction or non-conformance.

3. Mounting Orientation: Mounting orientation is universal.

4. Initial Lubrication: The main valve is factory-lubricated for life. If a lubricant is used in the system, use class 1 turbine oil (no additives), ISO VG32. Consult the SMC website for lubricant manufacturers' brands. For class 2 turbine oil (with additives), ISO VG32, contact SMC. Once the original lubricant is washed away, continuous lubrication is required.

5. Pilot EXH. (PE) Port: If the pilot EXH (PE) port is restricted or blocked, abnormal operation may occur.

Mounting Precautions:

1. Operation Manual: Install and operate products only after carefully reading and understanding the operation manual. Keep it accessible for reference.

2. Maintenance Space: Ensure sufficient space for maintenance and inspection activities when installing products.

3. Tighten Threads: Tighten threads with the proper torque specifications listed.

4. Leakage/Malfunction: If air leakage increases or equipment does not operate properly, stop operation. Check mounting conditions and perform initial function and leakage tests after installation.

5. Painting and Coating: Do not erase, remove, or cover warnings or specifications. Consult SMC before painting resinous parts, as solvents may cause adverse effects.

[Caution] Piping:

1. Refer to Fittings and Tubing Precautions for handling One-touch fittings.
2. Preparation: Before piping connection, thoroughly blow out with air (flushing) or wash to remove chips, cutting oil, and other debris from inside the pipe.

3. Sealant Tape: When screwing piping or fittings into ports, ensure that chips or sealing material do not enter the piping. If sealant tape is used, leave approximately one thread ridge exposed at the end of the threads.

   [Diagram Description: Shows sealant tape wound around a pipe thread, with the last thread ridge left unwound.]

4. Connection of Piping and Fittings: Tighten fittings as follows:

   • For fittings with sealant (R or NPT): Tighten by hand, then use a wrench to tighten the hexagonal portion an additional two or three turns. Refer to the table below for tightening torque.
   • If excessive torque is applied, excess sealant may seep out; remove it.
   • Insufficient tightening may cause seal failure or loosen threads.
   • For Reuse: Fittings with sealant can typically be reused 2-3 times. To prevent leakage, remove loose sealant by blowing air over the threaded portion. If sealing is no longer effective, wind new sealing tape over the existing sealant. Do not use sealant other than tape type. Backing out a tightened fitting often causes sealant defect and leakage.
   • When using non-SMC fittings, follow the fitting manufacturer's instructions.

   Proper Tightening Torque for R/NPT Fittings

   Connection thread size (R, NPT)	Proper tightening torque (N·m)
   1/8	3 to 5

5. Uni Thread Fittings: Tighten the threaded portion by hand, then use a wrench to tighten the hexagonal portion further by the specified angle. Refer to the table below for reference torque.

   Uni Thread Fittings - Rc,NPT

   Uni thread size	Wrench tightening angle after tightened by hand (deg)	Tightening torque (N·m)
   1/8	30 to 60	3 to 5

   Uni Thread Fittings - G

   Uni thread size	Wrench tightening angle after tightened by hand (deg)	Tightening torque (N·m)
   1/8	30 to 60	3 to 5

   The gasket can be reused 6-10 times and replaced if damaged. To remove a broken gasket, hold it and turn in the loosening direction. If difficult, cut with nippers, being careful not to scratch the sealing face.

6. Piping to Products: Refer to the operation manual to avoid mistakes regarding the supply port, etc.

Wiring, Lubrication, and Air Supply

Wiring Precautions:

[!] Warning: The solenoid valve is an electrical product. For safety, install an appropriate fuse and circuit breaker before use.

[Caution] Applied Voltage: Be careful to apply the proper voltage when connecting electric power. Improper voltage may cause malfunction or coil damage.

Check Connections: Verify that all wiring connections are correct after completion.

External Force on Lead Wire: If excessive force is applied to the lead wire, it may cause faulty wiring. Take measures to ensure a force of 30 N or more is not applied.

Lubrication Precautions:

[Warning] Lubrication:

1. The valve is lubricated for life by the factory and requires no further lubrication.
2. If a lubricant is used in the system, use class 1 turbine oil (no additives), ISO VG32. Consult the SMC website for lubricant manufacturers' brands. For class 2 turbine oil (with additives), ISO VG32, contact SMC. Once the original lubricant is washed away, continuous lubrication is required. Without it, malfunctions may occur. Refer to the Safety Data Sheet (SDS) for turbine oil.
3. Lubrication Amount: Excessive oil can accumulate inside the pilot valve, causing malfunction or response delay. Do not apply a large amount of oil. If a large amount is needed, use an external pilot type to supply air to the pilot valve side in a non-lube state to prevent oil accumulation.

Air Supply Precautions:

[Warning] Type of Fluids: Consult SMC when using the product in applications other than compressed air.

Large Amount of Drainage: Compressed air with significant drainage can cause pneumatic equipment malfunction. Install an air dryer or water separator upstream from filters. If drain bowls are not emptied regularly, they can overflow, causing malfunction. Consider a drain bowl with an auto drain option if checking and removal are difficult. Refer to the SMC Best Pneumatics No. 6 catalog for compressed air quality.

Use Clean Air: Do not use compressed air containing chemicals, synthetic oils with organic solvents, salt, or corrosive gases, as it can cause damage or malfunction.

[Caution] Extremely Dry Air: Using extremely dry air may degrade lubrication properties inside the equipment, reducing reliability or service life. Consult SMC.

Install Air Filter: Install an air filter upstream near the valve with a filtration size of 5 µm or smaller.

Ensure Air Quality: Take measures like installing an aftercooler, air dryer, or water separator to ensure air quality, as drainage can cause valve malfunction.

Carbon Powder: If excessive carbon powder is present, install a mist separator on the upstream side of the valve. Carbon dust can adhere to the valve interior and cause malfunction.

Operating Environment and Maintenance

Operating Environment Precautions:

[Warning]

1. Do not use in atmospheres containing corrosive gases, chemicals, sea water, water, or water vapor, or where there is direct contact with any of these.
2. Products with IP67 enclosures are protected against dust and water but cannot be used under water. Ensure proper mounting for IP67 compliance.
3. Do not use in environments with flammable gas or explosive gas, as products are not explosion-proof and usage may cause fire or explosion.
4. Do not use in places subject to heavy vibration and/or shock.
5. The valve should not be exposed to prolonged sunlight. Use a protective cover; the valve is not for outdoor use.
6. Remove any sources of excessive heat.
7. If there is possible contact with oil, weld spatter, etc., exercise preventive measures.
8. When the solenoid valve is mounted in a control panel or energized for a long period, ensure the ambient temperature is within the valve's specifications.

[Caution] Temperature of Ambient Environment: Use the valve within its specified ambient temperature range. Pay attention to environments with drastic temperature changes.

[Caution] Humidity of Ambient Environment: In low humidity environments, take measures to prevent static. If humidity rises, take measures to prevent water droplet adhesion on the valve.

Maintenance Precautions:

[Warning] Perform maintenance and inspection according to the operation manual. Improper handling can cause injury or equipment damage.

Removal of Equipment and Air Supply/Exhaust: Before removing components, confirm measures are in place to prevent workpieces from dropping or equipment run-away. Cut off supply air and electric power, and exhaust all air pressure using the residual pressure release function. When restarting, confirm measures to prevent actuator lurching and normal operation.

Low-Frequency Operation: Operate valves at least once every 30 days to prevent malfunction. Use caution regarding air supply.

Manual Override: When a manual override is operated, connected equipment will actuate. Operate only after safety is confirmed.

Malfunction: If air leakage increases or the valve does not operate normally, do not use the valve. Perform periodic maintenance to confirm operating condition and check for air leakage.

[Caution] Drain Flushing: Remove drainage from air filters regularly.

[Caution] Lubrication: For rubber seals, once lubrication starts, it must be continued. Use class 1 turbine oil (no additives), VG32. If other lubricant oil is used, it may cause malfunction. Contact SMC for information on suggested class 2 turbine oil (with additives), VG32.

Specific Product Precautions

Environment: Do not use valves in atmospheres with corrosive gases, chemicals, sea water, water, or water vapor, or where there is direct contact with any of these.

Manual Override: The manual override switches the main valve regardless of the electric signal. Confirm it is safe to do so beforehand, as the connected actuator will start.

Non-locking Push Type: Push the manual override button all the way down.

Installation: Even if inlet pressure is within the operating range, restricted piping diameter due to supply port (P) size reduction can lead to insufficient flow, causing the valve to not switch completely and the cylinder to malfunction.

Surge Voltage Suppressor (With Power-Saving Circuit): Power consumption is reduced to approximately 1/4 of startup power by eliminating the need for electrical current for holding (effective after being energized for more than 5 ms when 24 VDC rated voltage is applied).

Operating Principle: The circuit reduces power consumption by eliminating the need for electrical current for holding. Refer to the electrical power waveform graph.

[Diagram Description: A graph shows electrical power consumption over time. Initially, a higher power level is maintained for a brief period (approx. 5ms), after which it drops to a significantly lower, sustained level, illustrating the power-saving function.]

Residual Voltage of Surge Voltage Suppressor: If a diode surge voltage suppressor is used, there will be a residual voltage of approximately 1V. Pay attention to the surge voltage protection on the controller side.

M8 Connector Type:

Connector Cable: Connector cables for M8 connectors can be ordered as follows:

How to Order

1. To order a solenoid valve and connector cable together: (The connector cable will be included in the shipment of the solenoid valve.)

   Example: DXT1215T-5W□-01(-X1)

   Cable Length [mm]

   Symbol	Cable length [mm]
   1	300
   2	500
   3	1000
   4	2000
   5	3000
   6	4000
   7	5000

2. To order only the connector cable:

   Connector Dimensions

   Part no.	Cable length (L)	Sheath O.D.	Cover diameter	Conductor area
   V100-49-1-1	300 mm	Ø3.4 mm	35	Ø1.16 mm
   V100-49-1-2	500 mm			0.16 mm²
   V100-49-1-3	1000 mm
   V100-49-1-4	2000 mm
   V100-49-1-5	3000 mm
   V100-49-1-6	4000 mm
   V100-49-1-7	5000 mm

   [Diagram Description: Shows connector dimensions with labels for cable length (L), sheath O.D., cover diameter, and conductor area. Also shows pin wiring for the solenoid valve side: Pin 1 (+,-) and Pin 3 (-,+), with an LED indicator.]

   Recommended M8 Connector Angle Type

   Cable length	Product no.	Order No.
   1.5 m	SAC-3P-1,5-PUR/M 8FR	1669738
   3 m	SAC-3P-3,0-PUR/M 8FR	1669741
   5 m	SAC-3P-5,0-PUR/M 8FR	1669631
   10 m	SAC-3P-10,0-PUR/M 8FR	1694169

   [Note: Phoenix Contact products should be ordered directly from the manufacturer or its distributors.]

[Caution] The M8 connector type is IP67 compliant and protected against dust and water but cannot be used under water. Select an SMC connector cable (V100-49-1-) or an FA sensor type connector with M8 threaded 3-pin specifications conforming to NECA4202 (IEC 60947-5-2).

Connector Tightening: Do not use tools to mount the connector, as this may damage it. Tighten only by hand (0.4 to 0.6 N·m). Applying excessive force (over 30 N) on the cable connector will result in it no longer satisfying IP67 requirements. Failure to satisfy IP67 requirements may occur if using connectors other than those shown or if the connector is insufficiently tightened.

Valve Construction

2-position single

[Diagram Description: A cross-section of a solenoid valve shows internal components and ports labeled 1 (P), 2 (B), 3 (EB), 4 (A), and 5 (A). The diagram illustrates the flow paths for a 2-position single operation.]

Standard 5-port specification

[Diagram Description: A schematic symbol for a standard 5-port solenoid valve, showing two positions and five ports labeled 1, 2, 3, 4, 5.]

Made to Order 3-port specification (-X1)

[Diagram Description: A schematic symbol for a made-to-order 3-port solenoid valve, showing two positions and three ports labeled 1, 2, 3. The 3-port specification is a configuration where the 2(B) port is plugged and closed, and the 3(EB) port is kept open for pilot exhaust.]

Component Parts

Trouble shooting

For valve non-conformance, take the following countermeasures referring to the trouble:

If countermeasures are not effective, there may be a trouble with the valve. Stop using the valve immediately.

If any of the following examples are applicable, there may be an internal trouble with the valve. Stop using the valve immediately:

• It was used with a voltage other than the rated voltage.
• The supplied oil was not the specified type.
• Lubrication was stopped during operation or interrupted temporarily.
• Severe impact was applied.
• Foreign matter such as condensate or dust has entered the product.
• Other than the cases mentioned above, any usage which falls under the precautions in this operation manual.

* If the product has failed, return it without any modifications.