Datasheet

Precautions
 INSTALLATION
Power Reset Time
The Proximity Sensor is ready to operate within 100 ms after power
is supplied. If powersupplies are connected to the Proximity Sensor
and load respectively, be sure to supply power to the Proximity Sen-
sor before supplying power to the load.
Power OFF
The Proximity Sensor may output a pulse signalwhen it is turnedoff.
Therefore, it is recommended to turn off the load before turning off
the Proximity Sensor.
Power Supply Transformer
When using a DC power supply, make sure that the DC power sup-
ply hasaninsulatedtransformer. Donot use a DC powersupply with
an auto-transformer.
Sensing Object
Metal Coating:
The sensing distances of the Proximity Sensor vary with the metal
coating on sensing objects.
 WIRING
High-tension Lines:
Wiring through Metal Conduit
If there is a power or high-tension line near the cord of the Proximity
Sensor, wire the cord through an independent metal conduit to pre-
vent against Proximity Sensor damage or malfunctioning.
Cord Tractive Force
Do not pull cords with the tractive forces exceeding the following.
Diameter
Tractive force
4mmdia.max. 30 N max.
4 mm dia. min. 50 N max.
 MOUNTING
The Proximity Sensor must not be subjected to excessive shock
with a hammer when it is installed, otherwise the Proximity Sensor
may be damaged or lose its water-resistance.
 ENVIRONMENT
Water Resistance
Do not use the Proximity Sensor underwater, outdoors, or in the
rain.
Operating Environment
Be sure to use the Proximity Sensor within its operating ambient
temperature rangeanddo not usethe Proximity Sensor outdoors so
that its reliability and life expectancy can be maintained. Although
the Proximity Sensor is water resistant, a cover to protect the Prox-
imity Sensor from water or water soluble machining oil is recom-
mended so that its reliability and life expectancy can be maintained.
Do not use the Proximity Sensor in an environment with chemical
gas (e.g., strong alkaline or acid gasses including nitric, chromic,
and concentrated sulfuric acid gases).
 CONNECTING LOAD TO AC OR DC 2-WIRE
SENSOR
Refer to the following before using AC or DC 2-wire Proximity Sen-
sors.
Surge Protection
Although the Proximity Sensor has a surge absorption circuit, if
there is any machine that has a large surge current (e.g., a motor or
welding machine) near the Proximity Sensor, connect a surge ab-
sorber to the machine.
Leakage Current
When the Proximity Sensor is OFF, the Proximity Sensor has leak-
age current. Refer to Leakage Current Characteristics. In this case,
the load is imposed with a small voltage and the load may not be re-
set. Before using the Proximity Sensor, make sure that this voltage
is less than the load reset voltage. The AC 2-wire Proximity Sensor
cannot be connected to any card-lift-off relay (e.g., the G2A) be-
cause contact vibration of the relay will be caused by the leakage
current and the life of the relay will be shortened.
Countermeasures Against Leakage Current
AC 2-wire Models
Connect a bleeder resistor as the bypass for the leakage current so
that the current flowing into the load will be less than the load reset
current.
As shown in the following diagram, connect the bleeder resistor so
that the current flowing into theProximity Sensor will be 10 mA mini-
mum and the residual voltage imposed on the load will be less than
the load reset voltage.
Load
Bleeder resistor R
VAC power
supply V
S
Refer to the following to calculate the bleeder resistance and the al-
lowable power of the bleeder resistor.
R

V
S
/(10 -- I) (k
Ω
)
P>V
S
2
/R (mW)
P: The allowable power of the bleeder resistor. (The actual power
capacity of the bleeder resistor must be at least a few times as
large as the allowable power of the bleeder resistor.)
I: Load current (mA)
The following resistors are recommended.
100 VAC (supply voltage): A resistor with a resistance of 10 k
Ω
max-
imum and an allowable power of 3 W minimum
200 VAC (supply voltage): A resistor with a resistance of 20 k
Ω
max-
imum and an allowable power of 10 W minimum
If these resistors generate excessive heat, use a resistor with a re-
sistance of 10 k
Ω
maximum and an allowable power of 5 W mini-
mum at 100 VAC and a resistor with a resistance of 20 k
Ω
maximum
and an allowable power of 10 W minimum at 200 VAC instead.
DC 2-wire Models
Connect a bleeder resistor as the bypass for the leakage current so
that the current flowing into the load will be less than the load reset
current.
Load
Bleeder resistor R
E2E2 E2E2