Datasheet

Photomicrosensors
28
● Installation
• The Sensors without light modulation (i.e., EE-SX, EE-SY)
are built into the device being used and are, therefore, not
equipped to deal with interference from an external light
source. When using a Sensor without light modulation in an
area exposed to an incandescent light or other external light
interference, install so as to minimize the effects of external
light sources.
• Mount the Sensors securely on a flat surface.
• Mount the Sensor with two M3 screws, using a spring
washer to ensure the screws will not become loose. Use a
tightening force of 6 kgf·cm (0.59 N·m) max.
Note: Be sure to read the precautions for the model being used before
tightening the screws.
• Install so that nothing can collide with the sensing section of
the Sensor. Damage to the sensing surface will result in
inferior performance.
• Before using the Sensor, check to be sure that it has not
become loose due to vibration or shock.
● Wiring
Surge
• If there is surge in the power supply, try connecting a
capacitor (with a capacitance of 0.1 to 1 μF) or a Zener
diode (Z
D in the diagram below, with a rated voltage of 30 to
35 V). Use the Sensor only after confirming that the surge
has been removed.
• When driving a small inductive load, such as a relay, wire as
shown below. (Be sure to connect a diode to absorb the
reverse voltage.)
• Separate the wiring for the Sensor from high-tension lines
or power lines. If the wiring is routed in the same conduit or
duct as such lines, the Sensor will be damaged or its
operation will be affected by inductive interference.
• Make sure that the connectors (either dedicated or
commercially available) are securely locked.
Voltage Output
• A Sensor with an open-collector output can be connected to
a counter with a voltage input by connecting a resistor
between the power source and output. Select a resistor with
reference to the following example. The resistance of the
resistor is generally 4.7 kΩ and its wattage is 1/2 W for a
supply voltage of 24 V and 1/4 W for 12 V.
Example:
If resistance R = 4.7 kΩ for the EE-SX670, the input voltage
at the high level is as follows:
And the input voltage and load current at the low level are
as follows:
Input voltage V
L ≤ 0.4 V
(Residual voltage for 40-mA load current)
Note: Refer to the ratings of the Sensor for the residual voltage of the load
current.
Terminals
• Make sure that the terminals are not subjected to stress
(external force). Stress will cause damage to the terminals.
Precautions for Correct Use
ZD
ZD: Zener diode
L
OUT
0.1 to 1 μF
OUT
+V
0 V
D
Relay
X
Input voltage VH =
Z
VCC =
4.7 k
× 24 V
R + Z 4.7 k + 4.7 k
= 12 V
Residual voltage IC =
V
CC
=
V
CC
= 5.1 mA ≤ 40 mA
RR
SW
main
circuit
Tr
+Vcc
EE-SX670
Counter
(Voltage input type)
Insert a resistor
Output
0 V 0 V
R
24 V
Power supply
Z
Input terminal (CP)
(Input
impedance:
approx. 4.7 kΩ)
Terminal Terminal