Omron WLM - User manual

Long-life Two-circuit Limit Switch WLM@F-99
Limit
Switches
Long-life Two-circuit Limit Switch
WLM@
New Long-life Limit Switches Added to the
Wide Variety of WL Models
• Improved resistance to abrasion and smoother movement in the
head section means that a mechanical life of 30,000,000 oper-
ations minimum is now a reality.
• Wiring and replacement for maintenance purposes are easy
done.
• Fluorescent indicators improve visibility when setting stroke
zones.
Model Number Structure
■Model Number Legend
1. Actuators
CA2: Roller lever: Standard
GCA2: Roller lever: High-precision
H2: Roller lever: Overtravel, general-purpose
G2: Roller lever: Overtravel, high-sensitivity
2. Wiring Specifications
Blank: Screw terminal: G1/2 conduit
K13A: Direct-wired connector: 2-core, AC
K13: Direct-wired connector: 2-core, DC
K43A: Direct-wired connector: 4-core, AC
K43: Direct-wired connector: 4-core, DC
-M1J: Pre-wired connector: 2-core, DC (See note.)
-AGJ03: Pre-wired connector: 4-core, AC (See note.)
-DGJ03: Pre-wired connector: 4-core, DC (See note.)
Note: With 0.3-m cable attached.
1 2
WLM@-LD@

F-100 Long-life Two-circuit Limit Switch WLM@
Ordering Information
■List of Models
Roller Lever with LED
Note: 1. The default setting is light-ON when not operating (NO connection). To switch to light-ON when operating, simply rotate the lamp holder
by 180°. Contact your OMRON representative for details on the 2-core models.
2. 0.3-m cable attached.
3. One-side operation possible means that, by changing the direction of the operational plunger, one of three operating directions can be
selected. One-side operation not possible means that only operation on both sides is possible. See page 106 for details.
Applicable Cables
Use the Cables listed below with the Limit Switch with Connector.
Item Model
Type Standard Overtravel High-precision
General-purpose High-sensitivity
Overall movement
Features One-side operation not possible.
Head can be mounted in any of the four directions.
(See note 3.)
One-side operation possible.
Head can be mounted in any
of the four directions.
(See note 3.)
Screw terminal WLMCA2-LD WLMH2-LD WLMG2-LD WLMGCA2-LD
Direct-wired
connector
2-core AC WLMCA2-LDK13A WLMH2-LDK13A WLMG2-LDK13A WLMGCA2-LDK13A
DC WLMCA2-LDK13 WLMH2-LDK13 WLMG2-LDK13 WLMGCA2-LDK13
4-core AC WLMCA2-LDK43A WLMH2-LDK43A WLMG2-LDK43A WLMGCA2-LDK43A
DC WLMCA2-LDK43 WLMH2-LDK43 WLMG2-LDK43 WLMGCA2-LDK43
Pre-wired
connector
(See note 2.)
2-core DC WLMCA2-LD-M1J WLMH2-LD-M1J WLMG2-LD-M1J WLMGCA2-LD-M1J
4-core AC WLMCA2-LD-AGJ03 WLMH2-LD-AGJ03 WLMG2-LD-AGJ03 WLMGCA2-LD-AGJ03
DC WLMCA2-LD-DGJ03 WLMH2-LD-DGJ03 WLMG2-LD-DGJ03 WLMGCA2-LD-DGJ03
Voltage Core wires Cable length Model Connection wires
1234
AC 2 2 m XS2F-A421-DB0-A --- --- Brown Blue
5 m XS2F-A421-GB0-A
4 2 m XS2F-A421-D90-A Brown White Blue Black
5 m XS2F-A421-G90-A
DC 2 2 m XS2F-D421-DD0 --- --- Blue Brown
5 m XS2F-D421-GD0
4 2 m XS2F-D421-D80-A Brown White Blue Black
5 m XS2F-D421-G80-A

Long-life Two-circuit Limit Switch WLM@F-101
Limit
Switches
Specifications
■Ratings
General-purpose Ratings
Refer to these ratings before using the product.
Screw Terminal Models
Note: Only for high-sensitivity overtravel models.
Direct-wired/Pre-wired Models
Note: 1. The above figures are for standard currents.
2. Inductive loads have a power factor of 0.4 min. (AC) and a time constant of 7 ms max. (DC).
3. Lamp load has an inrush current of 10 times the steady-state current.
4. Motor load has an inrush current of 6 times the steady-state current.
■Characteristics
Note: 1. The figures in parentheses for dielectric strength, are those for overtravel (high-sensitivity) or connector models.
2. The values are calculated at an operating temperature of 5°C to 35°C, and an operating humidity of 40% to 70%. Contact your OMRON
sales representative for more detailed information on other operating environments.
Model Rated
voltage Non-inductive load Inductive load
Resistive load Lamp load Inductive load Motor load
NC NO NC NO NC NO NC NO
Standard, overtravel
(except high-sensitivity),
and high-precision
115 VAC 10 3 1.5 10 5 2.5
12 VDC 10 6 3 10 6
24 VDC 6 4 3 6 4
48 VDC 3 2 1.5 3 2
115 VDC 0.8 0.2 0.2 0.8 0.2
Overtravel
(High-sensitivity)
115 VAC 5 --- --- ---
115 VDC 0.4 --- --- ---
Inrush current NC 30 A max. (15 A max. (See note))
NO 20 A max. (10 A max. (See note))
Model Rated
voltage Non-inductive load Inductive load
Resistive load Lamp load Inductive load Motor load
NC NO NC NO NC NO NC NO
DC12VDC33333333
24VDC33333333
48VDC33333333
115 VDC 0.8 0.8 0.2 0.2 0.8 0.8 0.2 0.2
AC 115 VAC 3 3 3 1.5 3 3 3 2.5
Degree of protection IP67
Durability (See note 2.) Mechanical: 30,000,000 operations min. (10 mA at 24 VDC, resistive load)
Electrical: 750,000 operations min. (10 A at 115 VAC, resistive load),
but for high-precision models: 500,000 operations min. (10 A at 115 VAC, resistive load)
Operating speed 1 mm to 1 m/s (for WLMCA2)
Operating frequency Mechanical: 120 operations/minute
Electrical: 30 operations/minute
Rated frequency 50/60 Hz
Insulation resistance 100 MΩmin. (at 500 VDC)
Contact resistance 25 mΩmax. (initial value)
Dielectric strength 1,000 VAC, 50/60 Hz for 1 min between non-continuous terminals. (Except connector models.)
2,200 VAC (1,500 V), 50/60 Hz for 1 min between non-current-carrying metal part and ground.
2,200 VAC (1,500 V), 50/60 Hz for 1 min between each terminal and non-current-carrying metal part.
Vibration resistance 10 to 55 Hz, 1.5-mm double amplitude
Shock resistance Destruction: 1,000 m/s2min.
Malfunction: 300 m/s2min.
Ambient temperature Operating: –10°C to 80°C (with no icing)
Ambient humidity Operating: 95% max.
Weight Approx. 275 g (for WLMCA2)

F-102 Long-life Two-circuit Limit Switch WLM@
■Operating Characteristics
■Contact Form
Screw Terminal Models
WLM@-LD
Direct-wired Connector/Pre-wired Connector Models
AC Models: WLM@-LD@@
Note: Light-ON when not operating means that the lamp remains lit when the actuator is free, and goes out when the Limit Switch contacts (NO)
close when the actuator rotates or is pushed down.
Operating characteristics WLMCA2-LD@
Standard models WLMH2-LD@ Overtravel models
(general-purpose)
WLMG2-LD@
Overtravel models
(high-sensitivity)
WLMGCA2-LD@
High-precision models
OF max. 9.81 N 9.81 N 9.81 N 13.34 N
RF min. 0.98 N 0.98 N 0.98 N 1.47 N
PT
OT min. 30°55°65°40°
MD max. 12°12°7°3°
15±5°15±5°10
+2°
−1°
5
+2°
−0°
Lamp-equipped: Light-ON when not operating
Internal circuit
Built-in switch
Lamp-equipped: Light-ON when not operating (See note.)
Internal circuit
Built-in switch
Internal circuit
Built-in switch
AC model DC model
Pin No.
2-core
4-core
Pin No.
2-core
4-core

Long-life Two-circuit Limit Switch WLM@F-103
Limit
Switches
Engineering Data
■Electrical Durability: cosφ = 1
■Lamp-equipped Models
The operating status of the Switch can be checked using a neon
lamp of LED indictor.
Circuit checks and troubleshooting errors are easy done.
The built-in switch’s terminal screws are used to connect the lamp
terminal (indicator cover). Since the connection spring (coil spring) is
used for this connection, it will not be necessary to connect to the
lamp terminal. When a ground terminal is provided however, lead
wire method must be used.
WL-LD has a built-in rectifier stack, so it will not be necessary to
change the polarity.
The indicator cover is molded from diecast aluminum and has out-
standing sealing properties. Furthermore, regardless of whether the
power is connected or not, the operating status is shown (operating
or not operating), and indicators can be switched from light-ON when
operating and light-ON when not operating, by simply rotating the
lamp holder by 180°.
The lamp-equipped models are ideal in locations using a conveyor
belt where items need to be checked, or locations that are difficult to
inspect for faults.
Indicator Lamp and Load Operation
When the indicator lamp is set to light-ON when operating, connect
the load on the NC side, and set so that the load turns ON when the
actuator is free.
When the indicator lamp is set to light-ON when not operating, con-
nect the load on the NO side, and set so that the load turns ON when
the actuator is pushed down.
Light-ON when Operating
When the Switch’s contacts and the internal circuit of the lamp holder
are connected in parallel, there is large resistance from the internal
circuit, so the current will flow through the Switch’s contacts and the
load will turn ON.
When the contacts and the internal circuit are separated, only a
small voltage, enough to light the indicator lamp will flow to the lamp,
but the load will not turn ON.
Operation
Note: 1. Light-ON when operating means that the lamp lights when
the Limit Switch contacts (NC) release, or when the actuator
rotates or is pushed down.
2. Light-ON when not operating means the lamp remains lit
when the actuator is free, or when the Limit Switch contacts
(NO) close when the actuator rotates or is pushed down.
Operating temperature: 5°C to 30°C
Operating humidity: 40% to 70%
Switching current (mA)
Durability (x 104operations)
125 VAC
250 VAC
480 VAC
Operating frequency: 30 operations/min
cosφ= 1
Operation
indicator
window
Light emitting diode (LED)
Lamp holder
Contact spring
LIght-ON
when
operating
(See note 1.)
Light-ON
when not
operating
(See note 2.)
Light-ON when Operating
Light-ON when Not Operating
LED at bottom
LED at top
WL-LD Power supply
Built-in switch
Load
Internal circuit
WL-LD Power supply
Built-in switch
Load
Internal circuit

F-104 Long-life Two-circuit Limit Switch WLM@
Models/Ratings
Note: 1. In the model number, @indicates the actuator number. For
example, MCA2, etc.
2. The default setting is “light-ON when not operating.” Turn the
lamp holder by 180°to change the setting to “light-ON when
operating.”
Internal Circuits
Nomenclature
Note: By changing the direction of the operational plunger, any one of the three operational directions (both sides, left, or right) can be selected.
(Only applicable to the WLMGCA2-@.)
Operating
characteristics Maximum rated voltage Leakage current Lamp- equipped
Switch
Lamp-
equipped
cover only
LED 10 to
115 VAC, DC Approx. 1 mA WL@-LD (See note 1.) WL-LD
WL-LD
Contact spring Rectifier stack Resistance
Constant current diode
Light-emitting diode (LED)
Zener
diode
Operational Plunger (See note.)
Cover Seal
By using a packing seal as the cover seal, an
optimum squeeze can be obtained and high sealing
properties are assured as well.
Terminal Screws
Four, M4 screws
Cover
Separator
The separator has outstanding insulation
properties and prevents the generation of any
gases which may corrode the internal parts.
Cover Mounting Screw
A Phillips screw is used to ensure ease of use.
Conduit Opening
In addition to level screws which use G 1/2tube, direct-
wired and pre-wired connectors have been added.
Built-in Switch
Built-in switch with SPST-NO+NC contact form.
Bearing
The bearing smooths the plunger movement.
Shaft Section Seal
By fitting a double seal consisting of an oil seal
and an X-ring to the rotary shaft, even greater
sealing properties are achieved.
Head
The Head can be mounted in any of the
four directions by removing the screws at
the four corners of the Head. Requires maintenance
(excessive overtravel)
Proper range
Requires maintenance (insufficient overtravel)
Proper range
Requires maintenance (excessive overtravel)
Set Position Marker Plate
The set position is easy to view. The stroke is
indicated in fluorescent color that is visible from
the slit in the rubber cap.
Roller
The roller is made of self-lubricating stainless sintered
and boasts high resistance to wear.
Lever
The lever forged of anti-corrosive aluminium alloy
features high corrosion resistance and outstanding
ruggedness. With roller lever models, the actuator
position can be set anywhere within 360°. (The lever
cannot be mounted in the opposite direction.)
Standard Model Long-life Model
Smooth movement is achieved using
olefin grease. (Standard models use
molybdenum disulfide grease.)
Grease holder
Long-life Model
Standard Model
O-ring Oil seal X-ring
Standard Model Long-life Model
Standard Model Long-life Model
Sintered
alloy
Stainless steel
+
Hardening
Release Plunger
Hardening method changed for greater abrasion resistance.
Head
Mounting
Screws
Smoother Movement
A grease holder is provided on the shaft to
prevent the grease from running out.
Fluorescent paint

Long-life Two-circuit Limit Switch WLM@F-105
Limit
Switches
Dimensions
Rotating Lever Models: Standard
Note: Unless otherwise indicated, a tolerance of ±0.4 mm applies to all dimensions.
58.7±0.2
30.2 ± 0.2
29.2 ± 1.2
35
25.4
13.1
12.7
25.4
68.7
21.6
38R
14.7
5
(15.1)
(4.9)
53±1.5
41.5±1.5
40±1.5
40±0.7
53.2±0.8
58.7±0.2
30.2 ± 0.2
29.2 ± 1.2
35
25.4
13.1
12.7
25.4
68.7
21.6
38R
14.7
5
(15.1)
(4.9)
53±1.5
41.5±1.5
40±1.5
53.2±0.8
12.5
40±0.7
42 max.
Screw Terminals
WLM@-LD
Direct-wired Connectors
WLM@-LD@
Pre-wired Connectors
WLM@-LD@
17.5 dia. ×7 (See note)
Four, M3.5
(length: 26.5)
M5 ×12
Allen-head
bolt
Rubber cap
Three, M4 ×13
Lamp cover
JIS B0202 G1/2
Effective thread:
4 threads min.
Four, M6
Depth: 15 min.
60 max.
Four ,5.2+0.2dia.
holes
0
17.5 dia. ×5 (See note)
Four, M3.5
(length: 26.5)
M5 ×12
Allen-head
bolt
Rubber cap
Three, M4 ×13
Lamp cover
JIS B0202 G1/2
Effective thread:
4 threads min.
0
Four ,5.2+0.2dia.
holes
Four, M6
Depth: 15 min.
60 max.
42 max.
SC-2FD
M12 ×1
Note: Stainless steel rollerNote: Stainless steel roller
17.5 dia. ×7 (See note)
Four, M3.5
(length: 26.5)
M5 ×12
Allen-head
bolt
Rubber cap
Three, M4 ×13
Lamp cover
Four, M6
Depth: 15 min.
60 max.
0
Four, 5.2+0.2dia.
holes
42 max.
Note: Stainless steel roller
XS2H-D421
6 dia.
58.7±0.2
300±50
30.2 ± 0.2
29.2 ± 1.2
35
25.4
13.1
12.7
25.4
68.7
21.6
38R
14.7
5
(25)
(15.1)
(4.9)
53±1.5
41.5±1.5
40±1.5
53.2±0.8
40±0.7
52

F-106 Long-life Two-circuit Limit Switch WLM@
Accessories
Cable
Installation
Item Appropriate model/actuator Details
Changing the installation position of
the actuator
By loosening the Allen-head bolt on the
actuator lever, the position of the actua-
tor can be set anywhere within 360°.
With Lamp-equipped Switches, the ac-
tuator lever comes in contact with the
top of the lamp cover, so use caution
when rotating and setting the lever.
Roller Levers: WLMCA2@, WLMH2@,
WLMG2@, WLMGCA2@
Installing the roller on the inside
By installing the roller lever in the oppo-
site direction, the roller can be installed
on the inside. (Set so that operation can
be completed within a 180°level
range.)
Roller Levers: WLMCA2@, WLMH2@,
WLMG2@, WLMGCA2@
Changing the orientation of the head
By removing the screws in the four cor-
ners of the Head, the Head can be set
in any of the four directions. Be sure to
change the plunger for internal opera-
tions at the same time. (The operational
plunger does not need to be changed
on overtravel general-purpose and
overtravel high-sensitivity models.)
Roller Levers: WLMCA2@, WLMH2@,
WLMG2@, WLMGCA2@
Changing the operating direction
By removing the Head on models which
can operate on one-side, and then
changing the direction of the operation-
al plunger, one of three operating direc-
tions can be selected.
The tightening torque for the screws on
the Head is 0.78 to 0.88 N·m.
Roller Levers: WLMGCA2@
Straight
5 dia. 5 dia.
14.9 dia.
6 dia.
DC AC
Loosen the M5 ×12 bolt, set the
actuator's position and then
tighten the bolt again.
Loosen the
Allen head bolt
Head Loosen the screws
Loosen the
screws
Head
The output of the
Switch will be changed,
regardless of which
direction the lever is
pushed.
The output of the
Switch will only be
changed when the lever
is pushed in one
direction.
Operating
Operating Operating Operating
Not operating Not operating
Operational
plunger
Operation in both
directions
Clockwise operation Anti-clockwise
operation

Long-life Two-circuit Limit Switch WLM@F-107
Limit
Switches
Precautions
■Correct Use
When wiring terminal screws, use M4 round crimp terminals and
tighten screws to the recommended torque. Wiring with broken
wires, or the incorrect crimp terminals, or not tightening screws to the
recommended torque can lead to short-circuits, leakage current, and
fire.
When performing internal wiring there is a chance of short-circuit,
leakage current, or fire, so be sure to protect the inside of the Switch
from splashes of oil or water, corrosive gases, and cutting powder.
Using an inappropriate connector or assembling Switches incorrectly
(assembly, tightening torque) can result in malfunction, leakage cur-
rent, or fire, so be sure to read the instruction manual thoroughly
beforehand.
Even when the connector is assembled and set correctly, the end of
the cable and the inside of the Switch may come in contact. This can
lead to malfunction, leakage current, or fire, so be sure to protect the
end of the cable from splashes of oil or water and corrosive gases.
Environmental Precautions
When the Switch is used in locations subject to splashes of water or
oil, the material of the seal, which ensures the sealing properties of
the Switch, may undergo changes in shape and quality. This is due to
deterioration (including expansion and contraction), and may result in
reduced performance, ineffective return, and ineffective sealing
(leading to ineffective contact, insulation, leakage current, and fire).
Confirm the possible effects of the operating environment on the
Switch before use.
Built-in Switch
Do not replace the built-in switch. If the position of the insulation
sheet moves (separator), the insulation may become ineffective.
Tightening Torque
If screws are too loose they can lead to an early malfunction of the
Switch, so ensure that all screws are tightened using the correct
torque.
In particular, when changing the direction of the Head, make sure
that all screws are tightened again to the correct torque. Do not allow
foreign objects to fall into the Switch.
Installing the Switch
To install the Switch, make a mounting panel, as shown in the follow-
ing diagram, and tighten screws using the correct torque.
Connectors
Either the easy-to-use Allen-head nut or the SC Connector can be
used as connectors. To ensure high-sealing properties, use the SC
Connector. (SC-1M to -5M and others.)
No. Type Torque
1 Head mounting screw 0.78 to 0.88 N·m
2 Cover mounting screw 1.18 to 1.37 N·m
3 Allen-head bolt
(for securing the lever)
4.90 to 5.88 N·m
4 Terminal screw 0.59 to 0.78 N·m
5 Connector 1.77 to 2.16 N·m
6 Main Unit screws 4.90 to 5.88 N·m
0
Four, 5.2+0.2 dia. mounting holes or M5 taps

F-108 Long-life Two-circuit Limit Switch WLM@
Wiring
Use 1.25-mm lead wires and M4-insulation covered crimp terminals
for wiring.
Crimp Terminal External Dimensions
Wiring Method
Switch Box Section
Note: Ground terminals are not installed on the standard models.
Operation Set Position
There is a set position marker slit on the rubber cap of the head.
After operation, set the slit on the rubber cap so that the fluorescent
color on the shaft section can be seen.
Terminal Plate
By using a short circuit plate, as shown in the following diagram, the
Switch can be fabricated into a single-polarity double-break model.
When ordering specify WL Terminal-Plate (IWPA01).
.
D dia.
dz dia.
dz dia. 4.3
D dia. 4.5
B: 8.5
L: 21.0
F: 7.8
l: 9.0 (mm)
Ground terminal
NO terminal
NC terminal
16±0.15
9+0.2
2.1R
2R
3R
t = 0.6 Copper plate
In the interest of product improvement, specifications are subject to change without notice.
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
Cat. No. C112-E1-02