CSM_NL_DS_E_2_2
1
Limit Touch Switch
NL
Application Examples
Press
Workpiece
NL NL
NL
Paper (cloth)
NL NL
Grounding
rod
Grounding
rod
(Ground)
NL
Bellows
Controller
Unit
Pressure
NL Roller
Motor NL
Controller
Unit
Ground side
Paper (cloth)
NL
Paper (cloth)
NL
Grounding rod
· Detection of paper or cloth seam
(using indirect grounding).
· Detection of paper or cloth edge
(using indirect grounding).
· Thickness control of rolling plates.· Displacement detection and control.
· Drill positioning.
· Material positioning.
· Detection of workpiece edges.· Detection of press completion position.
· Detection of mistakes in workpiece
setting or removal.
· Detection of minute workpieces.
Object Actuates Switch and Turns
Built-in Monitor Indicator ON
•Instantaneous operation upon contact with extremely
limited hysteresis for high-precision position detection.
•Detects minute displacement or lightweight objects with
minimal operating force.
•Built-in LED indicator ensures easy operation monitoring.
•DC models provide versatile functions in combination
with the S3D2 Sensor Controller.
Be sure to read Safety Precautions on page 6 to 7 and
Safety Precautions for All Limit Switches.
2
NL
Ordering Information
Built-in Antenna Model
Note: Each model is provided with a standard 1-m cable.
Separate Antenna Model
Note: Each model is provided with a standard 1-m cable.
Specifications
*1. The NL3 has a capacitor and resistor for the protection of the built-in SCR. Therefore, the NL3 has leakage current.
*2. The NL3 requires a current of 30 mA for circuit protection.
If the load current is less than 30 mA, connect the bleeder resistance R in
parallel with the load as shown below so that the total current of the load circuit will be 30 to 300 mA.
Obtain R from the following formula.
Make sure that the permissible power of the resistor is sufficient.
*3. Between current-carrying and non-current-carrying metal parts
Model Built-in antenna model
Features · Provides sufficient OT (overtravel).
· Antenna tip withstands bending.
· Ensures high-precision positioning control.
· OT of 5-mm max. (overtravel)
Antenna
Series Power supply voltage Model Model
NL1 12 VDC NL1-C NL1-P
NL2 24 VDC NL2-C NL2-P
NL3 100 VAC NL3-C 100V NL3-P 100V
200 VAC NL3-C 200V NL3-P 200V
Antenna only NL1-C ANTENNA ASSY (Same for NL1, NL2, and NL3) ---
Model Separate antenna model
Features · Antenna with 3-m extension cable is available for narrow spaces where conventional limit switches cannot be used.
Antenna
Series Power supply voltage Model Model Model
NL1 12 VDC NL1-S NL1-SP NL1-SC
NL2 24 VDC NL2-S NL2-SP NL2-SC
Antenna only --- ---
NL1-SC ANTENNA (Same for NL1 and NL2)
Item Model NL1 NL2 NL3
Degree of protection IP60
Supply voltage 12 VDC 24 VDC 100 VAC or 200 VAC
Rated frequency --- 50/60 Hz
Sensitivity Grounded object: Contact resistance of 3 kΩ max.
Non-grounded object: Antenna-to-ground capacitance of 100 pF min.
Current consumption 8 mA 15 mA ---
Leakage current --- Circuit: 2 mA; Antenna: 1 mA *1
Response time 5 ms max. 20 ms max.
Output signal
Voltage output model: 30 mA at
12 VDC with output
impedance of 4.7 kΩ
Current output model:
24 VDC (directly switching
resistive load of 170 mA max.)
Thyristor output model:
100 or 200 VAC (directly switching resistive
load of 30 to 300 mA) *2
Insulation resistance 0 V (blue lead wire) is connected to casing 100 MΩ min. at 500 VDC *3
Dielectric strength 0 V (blue lead wire) is connected to casing 1,500 VAC at 50/60 Hz for 1 min *3
Pollution degree
(operating environment) 3 (IEC947-5-1)
Protection against
electric shock Class II
Proof tracking index (PTI) 175
Switch category D (IEC335)
Vibration resistance 10 to 55 Hz, 1.5-mm double amplitude
Shock resistance 200 m/s2 max.
Ambient temperature −10°C to +60°C (with no icing)
Ambient humidity 35% to 95%RH
Weight Approx. 370 g (NL@-C, -P) Approx. 550 g (NL@-S) Approx. 680 g (NL@-SP, -SC)
Coil spring Plunger
No antenna Plunger
with antenna
Coil spring with antenna
NL3 Black (Blue)
Power suppl
y
100 VAC
(200 VAC)
White
(Black)
R
i
Red (Brown)
Load
V
30−i
R= (kΩ)
3
NL
Structure and Nomenclature
Nomenclature
Principle of Operation
Classification by Series and Features
Contact your OMRON representative for the datasheet of the S3D2.
Applicable model Sensor Controller Function Power supply voltage
NL1
S3D2-AK Basic operation
100 to 240 VACS3D2-BK Memory and timer operation
S3D2-CK Timer operation
NL2 S3D2-AKD Basic operation 24 VDC
S3D2-CKD Timer operation
Coil spring antenna
O-ring
Rubber packing
Cable
SC connector
(not removable)
Cover
(not removable)
Head
LED operation
indicator
Mounting hole
(with mounting pitch
conforming to DIN standards)
Antenna assy
Antenna
The Limit Touch Switch
constantly emits a high
frequency. If an object
comes in touch with the
touch antenna, ..
Switching circuit
will operate and
send out output
signals.
Constants of the
oscillation circuit
will change and
oscillation will stop.
Applicable to a variety of
purposes in combination
with a dedicated sensor
power supply.
Feedback
circuit
Oscillation
circuit NOT circuit S3D Sensor
Power Supply
100 VAC
(200 VAC)
Wave detec-
tion circuit
NL1
Power supply
S3D2:
100 to 240 VAC
Load
Sensor
power supply
The S3D2 Controller is available
and has a variety of functions,
thus ensuring ease of use.
12 VDC
NL2
Load (24 VDC, 170 mA)
L/R=0
The NL2 with 24 VDC can
directly switch the load.
NL3
Load with 30 to 300 mA
(cos φ = 1) at 100/200 VAC
Power supply
100 VAC
(200 VAC)
Connects to 100/200 VAC
power supply and directly
switches AC loads.
NL1 NL2 NL3
4
NL
Connections
Output Circuit Diagrams
Note: The 0-V power supply side will be connected to the casing if the model is the NL1 or NL2.
External Connection
Sensor Power Supply (S3D2)
The use of the S3D2 is recommended for supplying 12 VDC to the
NL2 (or 24 VDC to the NL2) and converting the output of the NL into
relay or open collector output in versatile timing control. The NL3 does
not require a sensor power supply.
Be sure to wire the cable correctly according to the color of each lead wire. Do not wire power lines or high-tension lines alongside the
cable.
The use of S3D2 is recommended as a power supply to the NL1. Contact your OMRON representative for the datasheet of the S3D2.
Note: 1. The lead wire colors of the NL have been changed in compliance with the latest applicable JIS standards. Colors in parentheses are previous ones.
2. The figures in the S3D2 illustration indicate the terminal numbers of the socket.
3. Use a three-conductor cable with a minimum thickness of 0.75 mm to connect the NL and the Sensor Power Supply or other devices with no built-in contacts.
The cable can be extended up to 100 m on condition that the cable is wired in an independent conduit.
0 V
Output
+12 VD
C
Brown (Red)
Black (White)
Blue (Black)
4.7 kΩ
Switch
main
circuit
+24 VD
C
0 V
Output
Brown (Red)
Black
(White)
Blue (Black)
2.2 Ω
Switch
main
circuit
Load
Output
100 VAC, 200 VA
C
Brown (Red)
Black
(White)
Blue (Black)
Switch
main
circuit
Load
NL1 NL2 NL3
S3D2 Controller Unit
Applicable model Sensor Controller Power supply
voltage
NL1
S3D2-AK Basic operation
S3D2-BK Memory and timer
operation
S3D2-CK Timer operation
NL2 S3D2-AKD Basic operation
S3D2-CKD Timer operation
S3D2-AK
NL1 NL2
OUT Black
(White)
0 V Blue
(Black)
Brown
(Red)
IN1 IN2
NORM INV
Black
(White)
Blue
(Black)
+12 VDC Brown (Red)
* Ground the blue (black) wire.
* Be sure to ground the blue (black)
line of the NL3.
Black
(White)
(Output)
Blue (Black) *
External circuit
A maximum DC load of 170 mA
(with no inductance or resistance).
Can be switched directly.
Blue (Black)
24 VDC
0 V
10
7
11
8
12
9
1
4
2
5
3
6
Load
NL3
Black
(White)
(Output)
Blue (Black) *
External circuit
A maximum AC load of 300 mA
(cos φ = 1).
Can be switched directly.
Brown (Red)
100 VAC or
200 VAC
Load
5
NL
Dimensions (Unit: mm)
Built-in Antenna Models
Separated Antenna Models
The dimensions provided for the NL1-SP, NL2-SP, NL1-SC, and NL2-SC are the external dimensions for the antennas. The casing
dimensions of these models are all the same as those for the coil spring or plunger models.
Note: Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions.
1.2 dia. *1
5.3 dia.
25.8
16
15
5
7-dia. Connection
cable (1 m)
8
12.5 1
30
15
40±0.8
110±2
43.7±0.8
30
±
0.2
6.5±0.8
Two,
5.3±0.12 dia.
holes
Two, 5.3-dia.
long holes
(7.3)
*2
Caution label
LED operation
indicator
(15)
55
60±0.2
75
25 max.
*1.
The coil spring antenna is movable in any direction. Make sure
that the angle of the antenna is within 30° to the FP (free position)
after the antenna comes into contact with the object.
*2. Use after removing the caution label.
16
(99)
75
8
1
12.5
5 *2
31
5
15
40+0.8
30
+0.2
Two, 5.3-dia.
long holes
(7.3)
6 dia. *1
7-dia. Connection
cable (1 m)
25 max.
15
30
43.7
+0.8
60±0.2
Two,
5.3+0.12 dia.
holes
*3
Caution label
*1. The stainless-steel plunger antenna allows a maximum
OT (overtravel) of 5 mm.
*2. This position is the FP (free position) of the plunger.
*3. Use after removing the caution label.
Coil Spring
NL1-C
NL2-C
NL3-C
Plunger
NL1-P
NL2-P
NL3-P
Note: 1. The force that pushes the actuator must not exceed 1.96 N.
2. The antenna is replaceable. Contact your OMRON representative for
details.
Note: Do not apply a force greater than 9.8 N to the plunger.
40.5
±
2
1.2 dia. *1
*2
90.5±
2
(10.5) 31
22.5
863.5
*1.
The coil spring antenna is movable in any
direction. Make sure that the angle of the
antenna is within 30° to the FP (free position)
after the antenna comes into contact with the
object.
*2. A standard 3-m high-frequency coaxial
cable is provided.
*1
6 dia.
Two, M22 x 1
mounting nuts
Distance to
opposite side: 26
thickness: 4
()
(2.3R)
5 *2
16±0.2
35±0.5
*3
*1.
The stainless-steel plunger antenna
allows a maximum OT (overtravel)
of 5 mm.
*2. This position is the FP
(free position) of the plunger.
*3.
A standard 3-m high-frequency
coaxial cable is provided.
R16
51
t 2.3
12
20
32
4.5
16
35
(10.5) 31
22.5
86
Plunger Antenna
NL1-SP
NL2-SP
Coil Spring Antenna
NL1-SC
NL2-SC
No Antenna
NL1-S
NL2-S
Note: 1. Make sure that the shape of the antenna is suitable to the application.
Use the plunger antenna or coil spring antenna as shown right for the
NL1-S or NL2-S.
2. Do not cut or extend the connecting cable.
Note: 1. Do not apply a force greater than 9.8 N to the plunger.
2. Do not cut or extend the connecting cable.
Note: 1. Do not cut or extend the connecting cable.
2. The antenna is replaceable. Contact your OMRON representative for
details.
7 dia. *1
LED operation
indicator
Two, 5.3-dia.
long holes
(7.3)
16
15
30
(95)
75
8
1
(27)
25 max.
5
15
7-dia. Connection
cable (1 m)
Two,
5.3±0.12 dia.
holes
*2
Caution label
60±0.2
43.7
±
0.8
40±0.8
30
±
0.2
*1. A standard 3-m high-frequency coaxial cable is provided.
*2. Use after removing the caution label.
6
NL
Safety Precautions
Refer to Safety Precautions for All Limit Switches.
Make sure that the antenna does not come into contact
with the human body, otherwise an electric shock may
be received.
Antenna Grounded through Sensing Object
<Size of Sensing Object>
•Grounded Object
If the sensing object is the following grounded conductor, its size
will not affect the operation of the NL. Check for the presence of
insulators sticking to the sensing object or the corrosion of the
sensing object, however, so that the ground resistance will not
exceed 3 kΩ.
Contact with Grounded Conductor
The sensing object is equivalently grounded through ground resistor R.
R: 3 kΩ max.
The sensing object must not come into contact with the human body.
•Non-grounded Object
If the sensing object is the following non-grounded conductor, the
NL will operate if the capacitance between the sensing object and
the ground is 100 pF or more. The larger the surface area of the
sensing object is, the higher its capacitance will be. The shorter the
distance between the sensing object and the ground is, the higher
the capacitance will be. Furthermore, the capacitance greatly
varies with the ground condition (e.g., dry sand, concrete, or wet
soil).
Contact with Non-grounded Conductor
The sensing object is equivalently grounded through capacitor C.
C: 100 pF min.
<Conditions of Sensing Object>
•The detection of conductors (e.g., iron, stainless steel, aluminum,
and brass objects) poses no particular problem. A conductor
coated with paint cannot be detected, however, because there is no
electrical continuity between the antenna and the conductor.
•Non-conductive objects (e.g., plastic, ceramic, glass, and cloth
objects) can be detected by grounding them indirectly.
Antenna
<Shape and Extension>
If a metal plate is used as an antenna by connecting it to the built-in
or separated antenna of the NL, the surface area of the metal plate
must be 200 cm2 maximum. The antenna can be extended, provided
that the total length of the antenna is 1 m maximum and that the
bottom of the antenna is at least 10 cm away from the ground. Refer
to the illustrations below.
Antenna Connection
To connect a suitable antenna to the high-frequency coaxial cable of
the NL@-S, perform the following steps.
Braided Shield
•The shield is connected to the casing of the NL. Pay the utmost
attention so that the conductor connected to the antenna will not
come into contact with the shield. Secure the shield with insulation
tape.
•If the antenna cable needs to be extended, use the separated
antenna model. Do not use a standard cable in place of the high-
frequency coaxial cable.
CAUTION
Precautions for Correct Use
3 kΩ max.
R
Grounded
conductor
100 pF min.
Generally, the conductor will
be detectable if the ambient
humidity is 60% to 70%RH and
the surface area of the conductor
is approximately 300 × 500 mm.
C
Non-grounded
conductor
NL
Fig. 1
Metal plate
200cm
2
max.
NL
NL
10 cm min.
1 m max.
Ground
Fig. 2 Fig. 3
+ --- ≤1 m
56
6
4
3
2
1
1
Antenna
High-frequency
coaxial cable
Screwing (I) Screwing (II)
Antenna
High-frequency
coaxial cable
High-frequency
coaxial cable
Soldering
Antenna
Insulation tape
Braided shield
Conductor
Incorrect
Correct
NL
Standard cable
High-frequency coaxial cable
NL (separated
antenna model)
Antenna
Installation
Installation
7
NL
<Antenna in Parallel>
If more than one NL is used in parallel or side-by-side, make sure that
the distance between the antennas is at least 4 cm.
<Maintenance>
Make sure that the antenna is free of oil, dust, or rust, otherwise
the antenna may not operate.
Application in Locations Subject to Water or Oil.
Do not use the NL in places where water or oil (especially water-
soluble oil) is frequently sprayed to the NL or antenna, otherwise the
NL may malfunction.
Grounding
•In order to maintain the operational reliability of the NL, be sure to
ground the blue (black) wire of the power cable.
•The blue (black) lead wire of the connection cable will be connected
to the casing internally if the model is the NL1 or NL2. The NL1 or
NL2 does not operate with the service power supply of the PC
(Programmable Controller) because the negative end of the service
power supply is not grounded. The noise immunity performance of
the PC will be degraded if the negative end of the service power
supply is grounded.
•Provided that single-phase 200 V is supplied to the NL3, if one
phase is grounded, the power supply will be short-circuited and a
machinery breakdown will result. Use an isolating transformer and
ground the secondary side of the transformer instead.
•To maintain operating reliability and durability, connect the blue
(black) line in the connecting cable to ground.
•In the above case, be sure to ground the secondary side, otherwise
the NL may not operate.
Note: The lead wire colors of the NL have been changed in compliance with the
latest applicable JIS standards. Colors in parentheses are previous ones.
Others
•Do not disassemble the NL, otherwise the internal wiring will be
damaged and the NL will fail to operate.
•Make sure that the conduit opening is free of foreign materials or
cuttings.
•The sealing of the NL uses nitrile butadiene rubber (NBR), which is
highly oil resistive. If exposed to some types of oil or chemical
indoors or outdoors, however, the NBR may deteriorate. Contact
your OMRON representative for details.
•Make sure that the load is connected according to the connection
diagram. The internal circuit of the NL will break due to mistakes in
wiring or load short-circuiting.
Note: The lead wire colors of the NL have been changed in compliance with the
latest applicable JIS standards. Colors in parentheses are previous ones.
•Remove the warning label on the end of the connection cable
before wiring.
•Load Switching
The NL3 switches AC loads. The maximum switching load varies
with the ambient temperature as shown in the following graph of
load characteristic curves.
Note: 1. Load (1) is an inductive load with a maximum repetitive operation rate
of once per 5-minute period or resistive load.
2. Load (2) is an inductive load with a maximum repetitive operation rate
of 3 times per minute.
3. Load (3) is an inductive load with a maximum repetitive operation rate
of 30 times per minute.
4. Load (4) is an inductive load with a maximum repetitive operation rate
of 300 times per minute.
5. Except for the resistive load, the characteristic curves cover repetitive
operations in an ON-to-OFF ratio of 1:1. If the OFF period is extremely
short in actual application, use 80% of the above values.
NL
NL
4 cm min. NLNL
4 cm min.
NL3
AC
Brown
(Red)
Black
(White)
Blue
(Black)
Load
Brown (Red)
Incorrect
Black (White)(Output)
Blue (Black)
Power
supply
Load
Brown (Red)
Incorrect
Black (White)(Output)
Blue (Black)
Power
supply
Brown (Red)
Correct
Blue (Black)
Power
supply
Load
Black (White)
(Output)
(3)
(4)
0
(1)
NL3 Load Characteristic Curves
(2)
0.3
0.2
0.1
−15 20 40
Temperature (°C)
Switching current (A)
60
Read and Understand This Catalog
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or
comments.
Warranty and Limitations of Liability
WARRANTY
OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other period if specified)
from date of sale by OMRON.
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT, MERCHANTABILITY, OR
FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS
DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED.
LIMITATIONS OF LIABILITY
OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR COMMERCIAL LOSS
IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT
LIABILITY.
In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.
IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS REGARDING THE PRODUCTS UNLESS
OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT
SUBJECT TO CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.
Application Considerations
SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in the customer's
application or use of the products.
At the customer's request, OMRON will provide applicable third party certification documents identifying ratings and limitations of use that apply to the
products. This information by itself is not sufficient for a complete determination of the suitability of the products in combination with the end product,
machine, system, or other application or use.
The following are some examples of applications for which particular attention must be given. This is not intended to be an exhaustive list of all possible
uses of the products, nor is it intended to imply that the uses listed may be suitable for the products:
Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or uses not described in this catalog.
Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical equipment, amusement machines, vehicles,
safety equipment, and installations subject to separate industry or government regulations.
Systems, machines, and equipment that could present a risk to life or property.
Please know and observe all prohibitions of use applicable to the products.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE
SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE PROPERLY RATED AND
INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
PROGRAMMABLE PRODUCTS
OMRON shall not be responsible for the user's programming of a programmable product, or any consequence thereof.
Disclaimers
CHANGE IN SPECIFICATIONS
Product specifications and accessories may be changed at any time based on improvements and other reasons.
It is our practice to change model numbers when published ratings or features are changed, or when significant construction changes are made.
However, some specifications of the products may be changed without any notice. When in doubt, special model numbers may be assigned to fix or
establish key specifications for your application on your request. Please consult with your OMRON representative at any time to confirm actual
specifications of purchased products.
DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.
PERFORMANCE DATA
Performance data given in this catalog is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the
result of OMRON’s test conditions, and the users must correlate it to actual application requirements. Actual performance is subject to the OMRON
Warranty and Limitations of Liability.
ERRORS AND OMISSIONS
The information in this document has been carefully checked and is believed to be accurate; however, no responsibility is assumed for clerical,
typographical, or proofreading errors, or omissions.
2012.9
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2012 All Right Reserved.
