9
E2E-
@
Y/E2F-
@
Y
Precautions for Safe Use
The colors in parentheses are previous wire colors.
Precautions for Correct Use
Installation
Power Reset Time
The Proximity Sensor is ready to operate within 100 ms after power
is supplied. If power supplies 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 signal when it is turned
OFF. Therefore, it is recommended to turn OFF the load before turn-
ing OFF the Proximity Sensor.
Power Supply Transformer
When using a DC power supply, make sure that the DC power supply
has an insulated transformer. Do not use a DC power supply 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 cable of the Proximity
Sensor, wire the cable through an independent metal conduit to pre-
vent against Proximity Sensor damage or malfunctioning.
Cable Tractive Force
Do not pull on cables with tractive forces exceeding the following.
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-resistivity.
Environment
Water Resistivity
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 tem-
perature range and do not use the Proximity Sensor outdoors so that
its reliability and life expectancy can be maintained. Although the
Proximity Sensor is water resistive, a cover to protect the Proximity
Sensor from water or water soluble machining oil is recommended 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 2-wire Sensor
Refer to the following before using AC 2-wire Proximity Sensors.
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 weld-
ing machine) near the Proximity Sensor, connect a surge absorber to
the machine.
Leakage Current
When the Proximity Sensor is OFF, the Proximity Sensor has leak-
age current. Refer to 5 and 6 Leakage Current Characteristics. In this
case, the load is imposed with a small voltage and the load may not
be reset. Before using the Proximity Sensor, make sure that this volt-
age is less than the load reset voltage. The AC 2-wire Proximity Sen-
sor cannot be connected to any card-lift-off relay (e.g., the G2A)
because 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 the Proximity Sensor will be 10 mA mini-
mum and the residual voltage imposed on the load will be less than
the load reset voltage.
Refer to the following to calculate the bleeder resistance and the
allowable 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
maxi-
mum and an allowable power of 3 W minimum
200 VAC (supply voltage): A resistor with a resistance of 20 k
Ω
maxi-
mum and an allowable power of 10 W minimum
If these resistors generate excessive heat, use a resistor with a resis-
tance of 10 k
Ω
maximum and an allowable power of 5 W minimum 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.
WARNING
This product is not designed or rated for ensuring safety
of persons.
Do not use it for such purposes.
Item
Examples
Connection with no load
Make sure to connect a proper load to the E2E in operation, otherwise
it may explode or burn.
Sensor
Brown
Blue
Load
Incorrect
Diameter
Tractive force
4 dia.
50 N max.
Load
Bleeder resistor R
VAC power
supply V
S
