SMC D-K79 Auto Switch Instruction Manual

SMC D-K79 Auto Switch

The intended use of the auto switch is to detect and control the position of an actuator using magnetic detection.

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.

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 10218-1: Manipulating industrial robots -Safety. etc.

• Refer to product catalogue, Operation Manual and Handling Precautions for SMC Products for additional information.
• Keep this manual in a safe place for future reference.

  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

• Always ensure compliance with relevant safety laws and standards.
• All work must be carried out in a safe manner by a qualified person in compliance with applicable national regulations.
• This product is class A equipment intended for use in an industrial environment. There may be potential difficulties in ensuring electromagnetic compatibility in other environments due to conducted or radiated disturbances.
• Refer to the operation manual on the SMC website (URL: https://www.smcworld.com) for all Safety Instructions.

Warning

• Special products (-X or -####) might have specifications different from those shown in the Specifications section. Contact SMC for specific drawings.

Specifications

j3.4 mm, 0.2 mm2

Insulation resistance| 50 MΩ or more at 500 VDC mega (between case and cable)
Withstand voltage| 1000 VAC 1 minute (between case and cable)
Ambient temperature| -10 to 60 °C
Enclosure| IP67 to IEC 60529 (JISC0920)

Installation

Warning
Do not install the product unless the safety instructions have been read and understood.

Design and Selection

1. Confirm the specifications.
   Read the specifications carefully and use the product correctly. The product may be damaged or malfunction if it is used outside of the specification range.

2. Take precautions when multiple actuators are used close together.
   When multiple auto switch actuators are used in close proximity, magnetic field interference may cause the switches to malfunction. Maintain a minimum actuator separation of 40 mm.

3. Pay attention to the length of time that a switch is ON at an intermediate stroke position.
   When an auto switch is placed at an intermediate position of the stroke and a load is driven at the time the piston passes, the auto switch will operate, but if the speed is too great the operating time will be short and the load may not operate correctly. The maximum detectable piston speed is:

4. Keep wiring as short as possible
   Although long wire length does not affect the switch function, it is recommended to keep it to 100 m or less.

5. Do not use a load that generates surge voltage.
   Although a zener diode for surge protection is connected at the output side of a solid state auto switch, damage may still occur if the surge is applied repeatedly. When a load such as a relay or solenoid which generates surge is directly driven, use a type of switch with built in surge protection.

6. Caution for use in an interlock circuit
   When an auto switch is used for an interlock signal requiring high reliability, devise a double interlock system by providing a mechanical protection function, or by using another switch (sensor) together with the auto switch.

7. Perform periodic maintenance and confirm proper operation.
   Ensure sufficient clearance for maintenance activities.
   When designing an application, be sure to allow sufficient clearance for maintenance and inspections.

Mounting and Adjustment

1. Do not drop or bump the product.
   Do not drop, bump or apply excessive impact (1000 m/s2 or more) while handling. Although the body of the switch may not appear damaged, the inside of the switch could be damaged and cause a malfunction.

2. Do not carry an actuator by the auto switch lead wires.
   This may not only cause broken lead wires, but it may cause internal elements of the switch to be damaged by the stress.

3. Mount switches using the correct tightening torque.
   The tightening torque of the mounting screw must be 0.5 N•m.
   If a switch is tightened beyond the tightening torque range, the mounting screw, mounting bracket or switch may be damaged.
   On the other hand, tightening below the tightening torque range may allow the switch to slip out of position.

4. Mount a switch at the centre of the operating range.
   Adjust the auto switch mounting position so that the piston is at the centre of the operating range (the range in which the switch is ON).
   The mounting position shown in the catalogue indicates the optimum position at the end of stroke. If mounted at the end of the operating range (around the borderline of ON and OFF) operation may be unstable.

5. The auto switch ON and OFF position operates with a hysteresis. If the hysteresis causes a problem, please consult with SMC.

Mounting
Each actuator has a specified mounting bracket type.
Mounting depends on the actuator type and bore size. Please refer to the actuator catalogue for details.
When an auto switch is mounted for the first time, ensure that the actuator is the type with a magnet built-in, and prepare a mounting bracket corresponding to the actuator.

• D-G79# / D-K79# mounting

Setting the switch position

• Set the actuator at the stroke end. Set the switch in the area where the auto switch Red LED is ON (detection end position).
• Based on dimensions A and B in the actuator catalogue, set the switch. Tighten the mounting screw to the required torque.
• Tightening torque of mounting screw: 0.5 N•m (5 kgf•cm)

Wiring

1. Avoid repeatedly bending or stressing lead wires.
   Broken lead wires can result from wiring layouts which repeatedly apply bending stress or stretching force to the lead wires.

2. Confirm proper insulation of wiring.
   Check that there is no faulty wiring insulation (contact with other circuits, ground fault, improper insulation between terminals, etc.) Damage may occur due to excess current flow into a switch.

3. Do not route wiring with power lines or high voltage lines.
   Avoid parallel wiring or wiring in the same conduit with these lines. Control circuits containing auto switches may malfunction due to noise.

4. Do not allow short circuit of loads.
   The auto switch does not have built-in short circuit protection. Note that if a load is short circuited, the switch will be instantly damaged because of excess current flow into the switch.

5. Avoid incorrect wiring.
   If wiring is incorrect the switch will be damaged.

Wiring diagram

• D-G79# (NPN type)
• D-K79# (Sink mode)
• D-K79# (Source mode)

Auto switch with Pre-wired connector
Auto switches are available with pre-wired M8 or M12 connector. Refer to the “How to Order” information in the catalogue or operation manual on the SMC website (URL: https://www.smcworld.com) for details.

Connector pin assignment

Environment

Warning

• Do not use in an environment where oil, corrosive gases, chemicals, salt water or steam are present.

• Do not install in a location subject to vibration or impact in excess of the product specifications.

• Do not mount in a location exposed to radiant heat that would result in temperatures in excess of the product specification.

• Do not use in an area where a magnetic field is generated.
  Auto switches can malfunction or magnets inside actuators can become demagnetized.

• Do not use in an environment where the auto switch will be continually exposed to water.

• Do not use in an environment with temperature cycles.

• Avoid accumulation of iron waste or close contact with magnetic substances. A large amount of accumulated iron waste such as machining chips or spatter may cause the auto switch to malfunction.

Maintenance

General Maintenance

Caution

• Not following proper maintenance procedures could cause the product to malfunction and lead to equipment damage.

• If handled improperly, compressed air can be dangerous.

• Maintenance of pneumatic systems should be performed only by qualified personnel.

• Before performing maintenance, turn off the power supply and be sure to cut off the supply pressure. Confirm that the air is released to atmosphere.

• After installation and maintenance, apply operating pressure and power to the equipment and perform appropriate functional and leakage tests to make sure the equipment is installed correctly.

• If any electrical connections are disturbed during maintenance, ensure they are reconnected correctly and safety checks are carried out as
  required to ensure continued compliance with applicable national regulations.

• Do not make any modification to the product.

• Do not disassemble the product, unless required by installation or maintenance instructions.

• Perform the following maintenance periodically in order to prevent possible danger due to unexpected auto switch malfunction.

  1. Securely tighten switch mounting screws. If screws become loose or the mounting position is dislocated, re-tighten them after readjusting the mounting position.
  2. Confirm that there is no damage to lead wires. To prevent faulty insulation, replace switches or repair lead wires, etc., if damage is discovered

How to Order
Refer to the catalogue or operation manual on the SMC website (URL: https://www.smcworld.com) for How to order information.

Outline dimensions
Refer to the catalogue or operation manual on the SMC website (URL: https://www.smcworld.com) for Outline dimensions.

Troubleshooting

When detection failure occurs check the switch based on the flow chart.

• (A) = Auto switch output failure (replace)
• (B) = Check wiring and correct fault
• (C) = Auto switch failure.
• (D) = Replace actuator. Detectable magnetic field inadequate (or no magnet)

Limitations of Use

Limited warranty and Disclaimer/Compliance Requirements
Refer to Handling Precautions for SMC Products.

Product disposal
This product should not be disposed of as municipal waste. Check your local regulations and guidelines to dispose of this product correctly, in order to reduce the impact on human health and the environment.

Contacts
Refer to www.smcworld.com or www.smc.eu for your local distributor/importer.

URL:
https://www.smcworld.com (Global) https://www.smceu.com (Europe)
SMC Corporation, 4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021, Japan
Specifications are subject to change without prior notice from the manufacturer.
© 2021 SMC Corporation All Rights Reserved.
Template DKP50047-F-085M

References

• SMC Europe | SMC Europe
• SMC株式会社
• SMC Expertise - Passion - Automation
• SMC株式会社

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