WL-N/WLG
Gener
al-pur
pose Switches
En
vironment-resistant Switches
Spatter-pre
vention Switches
Long-lif
e Switches
Accessor
ies
Saf
ety Precautions
83
Safety Precautions
For the Safety Precautions for All Limit Switches, refer to the OMRON website.
Meanings of Warning Signal Text
• Be sure to ground. Otherwise electric shock may result.
• Do not touch charged switch terminals while the switch has carry
current, Otherwise electric shock may result.
• Do not disassemble the limit switch or touch inside of it under
supplying power, Otherwise electric shock may result.
• Do not disassemble or touch the inside while the power is turned
on. Otherwise electric shock may result.
• Do not touch the wire or rod type actuator in order to prevent injury.
Doing so may result in injury.
• Connect a fuse which has 1.5 to 2 times higher breaking current
than the switch rated current to the switch in series in order to
prevent the switch from short-circuit damage.
• On the occasion when using the switch with EN/IEC/GB ratings,
use a 10 A fuse that complies IEC60269, either type gG.
• The durability of switch is depends on the operating condition Be
sure to check the condition with actual using condition before
using, and use with the number of times of operating without a
performance problem.
• Otherwise, there is the possibility of spoiling the normal operation.
Do not drop the switch.
• Do not connect a Single Limit Switch to two power supplies that are
different in polarity or type. Risk of interference.
• Be sure to keep the load current less than the rated value.
Otherwise, there is the possibility that the switch may be damage
and/or burnout.
• Do not use the Switch by itself in atmospheres containing
flammable or explosive gases. Arcs and heating resulting from
switching may cause fire or explosion.
• Be sure to prevent the foreign materials such like a scrapped cable
intrusion in to the switch when wiring. Otherwise, there is the
possibility of spoiling the normal operation.
• Never wire to the wrong terminals.
• Using the Switch in a pressed-in state for an extended period of
time can accelerate part deterioration and also lead to failure to
return to the original position. Check the Switch beforehand, and
perform periodic inspection and replacement.
• Do not store or use the switch with following place.
Where the temperature fluctuates greatly.
Where the humidity is very high and condensation may occur.
Where the vibration is too much.
Where receiving direct sunshine.
Where receiving salty wind.
Where exposed to cutting powder, machining chips, oil, and
chemicals inside the protective doors.
Where exposed to cleansers, thinners, and other solvents
• Do not use or store the Switch in locations with corrosive gas, such
as sulfuric gas (H
2
S or SO
2
), ammonium gas (NH
3
), nitric gas
(HNO
3
), or chlorine gas (Cl
2
), or high temperature and humidity.
Otherwise, contact failure or corrosion damage may result.
• Do not disassemble and/or modify the switch at anytime.
• Otherwise, there is the possibility of spoiling the normal operation.
Do not apply the force such like deformation and/or degeneration
to the switch.
• If the Switch will not be switched ON or OFF for an extended period of
time, contact reliability may degrade due to oxidation of the contact
points, resulting in inadequate conductivity, which could lead to an
accident.
Operating Environment
• This switch is only for indoor use. If it is used in outdoor, it may be
cause of switch failure.
• Take special care to use where there is fine powder, mud and/or
foreign materials stacking. And check the condition with actual
using condition before using. Then use without a performance
problem.
• Seal material may deteriorate if a Switch is used outdoor or where
subject to special cutting oils, solvents, or chemicals. Always
appraise performance under actual application conditions and set
suitable maintenance and replacement periods.
• Install Switches where they will not be directly subject to cutting
chips, dust, or dirt. The Actuator and Switch must also be protected
from the accumulation of cutting chips or sludge.
• Constantly subjecting a Switch to vibration or shock can result in
wear, which can lead to contact interference with contacts,
operation failure, reduced durability, and other problems.
Excessive vibration or shock can lead to false contact operation or
damage. Install Switches in locations not subject to shock and
vibration and in orientations that will not produce resonance.
• The Switches have physical contacts. Using them in environments
containing silicon gas will result in the formation of silicon oxide
(SiO
2
) due to arc energy. If silicon oxide accumulates on the
contacts, contact interference can occur. If silicon oil, silicon filling
agents, silicon cables, or other silicon products are present near
the Switch, suppress arcing with contact protective circuits (surge
suppressor) or remove the source of silicon gas.
Installing the Switch
• To install the Switch, make a mounting panel, as shown in the
following diagram, and tighten screws using the appropriate
tightening torque.
* If the conduit size and ground terminal specifications are “with
TS 1/2-14NPT ground terminal”, the back mounting hole is 4-6.2 dia.
.
Precautions
for Safe Use
Indicates an action that must be performed or
avoided for safe use of this product.
Precautions
for Correct
Use
Indicates an action that must be performed or
avoided for preventing operation failure or
malfunction of the product or adverse impact
on performance or functionality.
Precautions for Safe Use
Precautions for Correct Use
Not Suitable
Suitable
±0.15
30.2
58.7
±0.15
+0.2
0
+0.2
0
Front Mounting : Four, 5.2 dia. holes
or M5 tapped holes
Rear Mounting : Four, 6.2 dia. holes
+0.2
0
