2. INSTALLATION AND OPERATING ENVIRONMENT
3.Model Indication Method
Installation & Maintenance Manual
Auto Switch (Solid State)
Series D-F79(W) / D-F7P(W)
Design and selection
Confirm the specifications.
Read the specifications carefully and use this product appropriately. The product may be damaged or malfunction if it is used outside the range of specifications for load current, voltage, temperature or impact.
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.
Avoid incorrect wiring
If connections are reversed (power supply line + and power supply line
Operating environment
Do not use in an area where a magnetic field is generated.
Auto switches can malfunction or magnets inside actuators can become demagnetized.
Switch No. 
Output
F79 3wire NPN output
F7P 3wire PNP output
J79 2wire
Indication LED
No number | 1 color display |
W2 color display
Lead wire length |
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No number | 0.5m |
L3m
Z5m
Read this manual before using this product.
For future reference, please keep this manual in a safe place.
This manual should be read in conjunction with the current catalogue.
1.1 General recommendation
These safety instructions are intended to prevent a hazardous situation and/or equipment damage.
These instructions indicate the level of potential hazard by label of "Caution", "Warning" or "Danger".
To ensure safety of personnel and equipment the safety instructions in this manual and the product catalogue must be observed, along with other relevant safety practices.
Maintain a minimum actuator separation of 40mm.
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 shortened and the load may not operate properly. The maximum detectable piston speed is:
Autoswitch operating range [mm]
Load operating time [ms]
Keep wiring as short as possible
Although longer wiring does not affect the function, please keep it to 100m or shorter.
Do not use in an environment where the auto switch will be continually exposed to water.
Although switches satisfy IEC standard IP67 construction (JIS C 0920: watertight construction), avoid using switches in applications with continual exposure to water splash or spray. Poor insulation or swelling of the potting resin inside switches may cause malfunction.
Do not use in an environment with oil or chemicals.
Consult SMC if auto switches are to be used in an environment with coolant, cleaning solvent, various oils or chemicals. If auto switches are used under these conditions for even a short time, they may be adversely affected by improper insulation, malfunction due to swelling of the potting resin, or hardening of the lead wires.
Do not use in an environment with temperature cycles.
Consult SMC if switches are used where there are temperature cycles
Switch No. 
Output
F79 3wire NPN output
F7P 3wire PNP output
J79 2wire
Indication LED
No number | 1 color display |
W2 color display
Lead wire length
S0.5m
M 1m
PC
Connector pin assignment
A
B
D
Caution
Warning 
Danger
Operator error could result in injury or equipment damage.
Operator error could result in serious injury or loss of life.
In extreme conditions, there is a possible result of serious injury or loss of life.
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 a
Cautions for use in an interlock circuit
When an auto switch is used for an interlock signal requiring high reliability, devise a double interlock system to avoid trouble by providing a mechanical protection function, or by also using another switch (sensor) together with the auto switch.
Also perform periodic maintenance and confirm proper operation.
Ensure sufficient clearance for maintenance activities.
other than normal air temperature changes, as there may be adverse effects inside the switches.
Do not use in an area where surges are generated.
When there are units (solenoid type lifter, high frequency induction furnace, motor, etc.) which generate a large amount of surge in the area around actuators with solid state auto switches, this may cause deterioration or damage to the switches. Avoid sources of surge generation and crossed
lines.
Avoid accumulation of iron waste or close contact with magnetic substances.
When a large amount of iron waste such as machining chips or spatter has accumulated, or a magnetic substance (something attracted by a magnet) is
D-F7BA 
Switch No.
Lead wire length
L3m
Z5m
D-F7BA 
PC
Switch No. 
Lead wire length |
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S | 0.5m |
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M | 1m |
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1.1.1. The compatibility of pneumatic equipment is the responsibility |
of the person who designs the pneumatic system or decides |
its specifications. |
Since the products specified here are used in various operating |
When designing an application, be sure to allow sufficient clearance for maintenance and inspections.
brought into close proximity with an auto switch actuator, it may cause auto switches to malfunction due to a loss of the magnetic force inside the actuator.
Connector pin assignment | |
A | |
B | |
D | |
conditions,their compatibility for the specific pneumatic system |
must be based on specifications or after analysis and/or tests to |
meet your specific requirements. |
1.1.2. Only trained personnel should operate pneumatically operated |
machinery and equipment. |
Compressed air can be dangerous if an operator is unfamiliar with it |
Assembly, handling or repair of pneumatic systems should be |
performed by trained and experienced operators. |
1.1.3. Do not service machinery/equipment or attempt to remove |
component until safety is confirmed. |
1)Inspection and maintenance of machinery/equipment should only be performed after confirmation of safe
2)When equipment is to be removed, confirm the safety process as mentioned above. Switch off air and electrical supplies and exhaust all residual compressed air in the system.
3)Before machinery/equipment is
1.1.4.Contact SMC if the product is to be used in any of the following conditions:
1)Conditions and environments beyond the given specifications, or if product is used outdoors.
2)Installations in conjunction with atomic energy, railway, air navigation, vehicles, medical equipment, food and beverage, recreation equipment, emergency stop circuits, press applications, or safety equipment.
3)Equipment intended for use in potentially explosive atmospheres. Applications which have the possibility of having negative effects on people, property or animals.
Special safety analysis is required.
Mount / adjustment
Do not drop or bump.
Do not drop, bump or apply excessive impacts (1000m/s2 or more for solid state switches) while handling. Although the body of the switch may not be damaged, the inside of the switch could be damaged and cause a malfunction.
Do not carry a actuator by the auto switch lead wires.
Never carry an actuator by its 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.
Mount switches using the proper tightening torque.
If a switch is tightened beyond the range of tightening torque, the mounting screws, mounting brackets or switch may be damaged.
On the other hand, tightening below the range of tightening torque may allow the switch to slip out of position.
Mount a switch at the center of the operating range.
Adjust the mounting position of an auto switch so that the piston stops at the center of the operating range (the range in which a switch is ON). (The mounting position shown in the catalog indicates the optimum position at stroke end.) If mounted at the end of the operating range (around the borderline of ON and OFF), operation may be unstable.
Wiring
Avoid repeatedly bending or stretching lead wires.
Broken lead wires can result from wiring patterns which repeatedly apply bending stress or stretching force to the lead wires.
Confirm proper insulation of wiring.
Be certain 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.
Do not wire with power lines or high voltage lines.
Wire separately from power lines or high voltage lines, avoiding parallel wiring or wiring in the same conduit with these lines. Control circuits containing auto switches may malfunction due to noise from these other lines.
Do not allow short circuit of loads.
All models of PNP output type switches do not have
Note that if a load is short circuited, the switch will be instantly damaged because of excess current flow into the switch.
*Take special care to avoid reverse wiring of the brown power supply line and the black output line on
Maintenance
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, retighten 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.
Others
For durability against water, elasticity, application at welding site, please consult us.
If ON and OFF position (hysteresis) cause problems, please consult us.
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4.INTENDED CONDITIONS OF USE
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Wiring | 3 wire | 2 wire | ||||
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Output | NPN | PNP |
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Application | IC circuit/Relay/PLC | 24V DC Relay/PLC | ||||
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Power voltage | 5/12/24V DC (4.5 to 28V DC) |
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Current consumption | 10mA or less |
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Load voltage | 28V DC or less | - | 24V DC(10 to 28V DC) | |||
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Load current | 40mA or less | 80mA or less | 5 to 40mA | |||
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Internal voltage drop | (0.8V or less | 0.8V or less | 4V or less | |||
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Current leakage | 100 A or less at 24V DC | 0.8mA or less at 24V DC | ||||
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Operating time |
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Indication light |
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| Operating range Red LED / Most Sensitive range Green LED |
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Impact resistance |
| 1000m/s2 |
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Insulation resistance | 50M or more at 500V DC mega | |||||
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Withstand voltage | 1000V AC for 1 minute (lead wire, between cases) | |||||
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Ambient temperature |
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Protection structure |
| IEC60529 standard IP67 |
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