EE-SX91
Safety Precautions
Refer to Warranty and Limitations of Liability.
WARNING
Precautions for Correct Use
This product is not designed or rated for ensuring
safety of persons either directly or indirectly. Do not
use it for such purposes.
● Installation
• It is assumed that EE-SX91 Sensors will be built into a device.
These Sensors use non-modulated light and are not equipped to
deal with interference from an external light source. When they are
used in locations subject to external light interference, such as near
a window or under an incandescent light, install them to minimize
the effects of external light interference.
Precautions for Safe Use
• Power Supply Voltage
• Mount the Sensors securely on a flat surface.
Do not exceed the voltage range
Brown
Blue
Load
Black
• Use M3 or M2.0 screws to secure the Photomicrosensor. (The
stronger M3 screws are recommended. In addition, use flat
washers and spring washers to prevent the screws from loosening.)
Refer to the following table for the correct tightening torque.
indicated in the specifications.
Applying a voltage exceeding
the specifications or using an AC
power supply may result in
rupture or burning.
Load
Sensor
White
Screw diameter
M2.0
M3
Tightening torque
0.15 N·m max.
0.54 N·m max.
• Faulty Wiring
Do not reverse the power supply
polarity. Doing so may result in
rupture or burning.
• Do not short-circuit the load. (Do
not connect to the power
supply.)
Brown
Load
Load
Black
• If the Sensor is to be used on a moving part, secure the cable
connection point so that it is not directly subjected to stress.
−
+
Sensor
White
Blue
● Wiring
Unused Output Lines
Be sure to isolate output lines that are not going to be used.
Doing so may result in rupture or
burning.
Connecting to Devices with Voltage Input Specifications
(Load short-circuit)
• Dispose of this product as
industrial waste.
Brown
Load
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.
Load
+
−
Black
Sensor
White
Blue
Insert a resistor
Counter (Voltage input type)
+Vcc
24 V
EE-SX91 series
Power supply
R
SW
main
circuit
Input terminal (CP)
Tr
Output
0 V
Z
(Input impedance:
approx. 5.6 kΩ)
0 V
Example: EE-SX91 Series
Load Resistance of 4.7 kΩ Connected in a Counter
Counter Specifications
Input impedance
5.6 KΩ
Voltage judged as high level (input ON)
Voltage judged as low level (input OFF)
4.5 to 30 VDC
0 to 2 VDC
The high and low levels are found using the following formulas. The
input device specifications must satisfy both formulas.
High level:
Z
R+Z
5.6 k
4.7 k+5.6 k
× 24 V = 13 V
Input voltage VH =
Vcc =
Low level:
Vcc
R
24 V
R
Load current Ic =
=
= 5.1 mA ≤ 100 mA
Input voltage VL ≤ 1.0 V (Residual voltage for 100-mA load
current)
Note: Refer to the ratings of the Sensor for the residual voltage of the load
current.
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