Proximity Sensors Technical Guide
General Precautions
For precautions on individual products, refer to the
Safety Precautions
in individual product information.
These products cannot be used in safety devices for
presses or other safety devices used to protect human
life.
These products are designed for use in applications for
sensing workpieces and workers that do not affect safety.
To ensure safety, always observe the following precautions.
●
Wiring Considerations
●
Operating Environment
Do not use the Sensor in an environment where there are explosive or combustible gases.
WARNING
Precautions for Safe Use
Item
Typical examples
Power Supply Voltage
Do not use a voltage that exceeds the operat-
ing voltage range. Applying a voltage that is
higher than the operating voltage range, or us-
ing an AC power supply (100 VAC or higher)
for a Sensor that requires a DC power supply
may cause explosion or burning.
DC 3-Wire NPN Output Sensors
DC 2-Wire Sensors
Load short-circuiting
•
Do not short-circuit the load. Explosion or
burning may result.
•
The load short-circuit protection function op-
erates when the power supply is connected
with the correct polarity and the power is
within the rated voltage range.
DC 3-Wire NPN Output Sensors
•
DC 2-Wire Sensors
•
Even with the load short-circuit protection
function, protection will not be provided when
a load short circuit occurs if the power supply
polarity is not correct.
Incorrect Wiring
Be sure that the power supply polarity and oth-
er wiring is correct. Incorrect wiring may cause
explosion or burning.
DC 3-Wire NPN Output Sensors
Connection without a Load
If the power supply is connected directly with-
out a load, the internal elements may explode
or burn. Be sure to insert a load when connect-
ing the power supply.
•
DC 2-Wire Sensors
•
Even with the load short-circuit protection
function, protection will not be provided if
both the power supply polarity is incorrect
and no load is connected.
AC 2-Wire Sensors
Load
Sensor
Brown
Blue
Black
Load
Sensor
Brown
Blue
−
+
(Load short
circuit)
Load
Sensor
Brown
Blue
Black
(Load short circuit)
Load
Sensor
Brown
Blue
−
+
+
−
−
+
Load
Load
Sensor
Brown
Black
Blue
Sensor
Brown
Blue
Black
−
+
Sensor
Brown
Blue
Sensor
Brown
Blue
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