General Precautions - Omron E3Z-L User Manual

General Precautions

These Sensors cannot be used in safety devices for
presses or other safety devices used to protect
human life. These Sensors are designed for use in
applications for sensing workpieces and workers
that do not affect safety.
Precautions for Safe Use
To ensure safety, always observe the following precautions.
● Wiring
Item
Power Supply Voltage
Do not use a voltage in
excess of the operating
voltage range.
Applying a voltage in excess
of the operating voltage
range, or applying AC power
(100 VAC or greater) to a DC
Sensor may cause explosion
or burning.
Load Short-circuiting
Do not short-circuit the load.
Doing so may cause explo-
sion or burning.
Incorrect Wiring
Do not reverse the power
supply polarity or otherwise
wire incorrectly. Doing so
may cause explosion or
burning.
Connection without a
load
If the power supply is
connected directly without a
load, the internal elements
may burst or burn. Be sure to
insert a load when
connecting the power
supply.
● Operating Environment
(1) Do not use a Sensor in an environment where there are explosive or inflammable gases.
(2) Do not use the Sensor in environments where the cables may become immersed in oil or other liquids or where liquids may penetrate the
Sensor. Doing so may result in damage from burning and fire, particularly if the liquid is flammable.
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For precautions on individual products, refer to Safety Precautions in individual product information.
WARNING
• DC Three-wire NPN Output Sensors
Load
Brown
Sensor
Black
Blue
• DC Three-wire NPN Output Sensor
Load
Brown
Sensor
Black
Blue
• DC Three-wire NPN Output Sensors
Example: Incorrect Polarity
Load
Brown
Sensor
Black
Blue
• DC Three-wire NPN Output Sensors
Sensor
http://www.ia.omron.com/
Photoelectric Sensors Technical Guide
Typical examples
• AC Two-wire Sensors
Example: E3E2
+
(Load
Brown
-
short
Sensor
circuit)
Blue
• DC Three-wire NPN Output Sensors
Example: Incorrect Polarity Wiring
-
Brown
Sensor
+
Black
Blue
• AC 2-wire Sensors
Example: E3E2 etc.
Brown
12 to
24VDC
Brown
Black
Sensor
Blue
0V
Blue
(c)Copyright OMRON Corporation 2007 All Rights Reserved.
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Load
(Load short circuit)
Load
Brown
Sensor
Blue
-
Black
+
Load
+
-
C-1