Proximity Sensors Technical Guide

General Precautions

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.

For precautions on individual products, refer to the Safety Precautions

in individual product information.

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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