Avoid incorrect wiring
If connections are reversed (power supply line + and power supply line –) on a 3-
wire type switch, the switch will be protected by a protection circuit. However, if
the power supply line (+) is connected to the blue wire and the power supply line
(–) is connected to the black wire, the switch will be damaged.
Do not cut lead wire between sensor and amplifier part.
Circuit of sensor and amplifier are adjusted integrally, if sensor part is replaced,
switch can not operate properly.
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.
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 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.
Mount / adjustment
Do not drop or bump.
Do not drop, bump or apply excessive impacts (1000m/s
2
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 built-in short circuit
protection circuits.
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 3-wire type switches.
Piston moving
direction
ON position
Piston moving
direction
OFF position
Hysteresis
Installation & Maintenance Manual
Auto Switch
(Solid State)
Series D-F7NJL
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.
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.
Caution
Warning
Danger
:
:
:
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
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 locked-out control positions.
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 re-started, ensure all safety measures to
prevent sudden movement of actuators etc. (Supply air into the system
gradually to create backpressure, i.e. incorporate a soft-start valve).
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.
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. 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:
Keep wiring as short as possible
Although longer wiring does not affect the function, please keep it to 100m or
shorter.
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 built-in surge absorbing element.
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.
When designing an application, be sure to allow sufficient clearance for
maintenance and inspections.
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
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.
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.
2. INSTALLATION AND OPERATING ENVIRONMENT
3.Model Indication Method
D-F7NJ
Lead wire length
L
3m
Z
5m
Switch No.
D-#S-TFI88GB-A
4.INTENDED CONDITIONS OF USE
Impact resistance
Sensor : 1000m/s
2
Ambient temperature
Sensor : 0 to 150
Protection structure
IEC60529 standard IP67
Wiring
3 wire
Output
NPN
Application
Relay, Sequence control
Power voltage
24VDC (20 to 26VDC)
Current consumption
25mA or less
Load voltage
28V DC or less
Load current
40mA or less
Internal voltage drop
Current leakage
100 A or less
Operating time
1ms or less
Indication light
(Amplifier)
Operating range Red LED
Switch model number
D-F7NJL
Most sensitive range Green LED
0.8V or less
Amplifier : 300m/s
2
Amplifier : 0 to 60
Danger
Warning
Caution
Warning
Warning
Autoswitch operating range [
mm
]
Load operating time [
ms
]
Warning
Piston moving
direction
Piston moving
ON position
OFF position
Hysteresis
Switch No.
Lead wire length
direction
