E2E2-WIREDC
E2E2-WIREDC
20
JINSTALLATION
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 turning off
the Proximity Sensor.
Power Supply Transformer
When using a DC power supply, make sure that the DC power sup-
ply 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.
JWIRING
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 cable with the tractive forces exceeding the following.
Diameter Tractive force
4mmdia.max. 30 N max.
4 mm dia. min. 50 N max.
JMOUNTING
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.
JENVIRONMENT
Water Resistance
Do not use the Proximity Sensor underwater, outdoors, or in the
rain.
Operating Environment
Use the Proximity Sensor within its operating ambient temperature
range and do not use the Proximity Sensor outdoors, in order to
maintain its reliability and life expectancy. Although the Proximity
Sensor is water resistant, a cover to protect the Proximity Sensor
from water or water soluble machining oil is recommended to main-
tain its reliability and life expectancy. Do not use the Proximity Sen-
sor in an environment with chemical gas (e.g., strong alkaline or
acid gasses including nitric, chromic, and concentrated sulfuric acid
gases).
JCONNECTING LOAD TO DC 2-WIRE SENSOR
Refer to the following before using AC or DC 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 welding machine) near the Proximity Sensor, connect a surge
absorber to the machine.
Leakage Current
When it is OFF, the Proximity Sensor has leakage current. Refer
to 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 voltage is
less than the load reset voltage.
Countermeasures Against Leakage Current
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
Refer to the following to calculate the bleeder resistance and the
allowable power of the bleeder resistor.
R≦VS/(iR-- i OFF)(kΩ)
P>V
S2/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.)
iR: Leakage current of Sensors (mA)
iOFF: Release current of load (mA)
The following resistors are recommended.
12 VDC (supply voltage): A resistor with a resistance of 15 kΩ
maximum and an allowable power of 450 mW minimum 24 VDC
(supply voltage): A resistor with a resistance of 30 kΩmaximum
and an allowable power of 0.1 W minimum
Inrush Current
A load that has a large inrush current (e.g., a lamp or motor) will
damage the Proximity Sensor, in which case connect the load to
the Proximity Sensor through a relay.