12
Standard Photoelectric Sensors
Safety Precautions
This product is not designed or rated for ensuring
safety of persons. Do not use it for such purpose.
Do not apply AC power to the E3T, otherwise the
E3T may rupture.
Do not use the product in atmospheres or environment that
exceed product ratings.
Wiring
The maximum power supply voltage is 24 VDC +10%. Before
turning the power ON, make sure that the power supply volt-
age is not more than maximum voltage.
Load short-circuit protection
The E3T incorporates a load short-circuit protection function.
If the load short-circuits, the output of the E3T will be turned
OFF. Then, recheck the wiring and turn on the E3T again to
reset the load short-circuit protection function. The load short-
circuit protection function will work if there is a current flow
that is 2.4 times larger than the rated load current. When us-
ing an inductance load, be sure that the inrush current will not
exceed 2.4 times larger than the rated current.
Mounting
When mounting the Sensor, never strike it with a heavy ob-
ject, such as a hammer. Doing so may reduce its watertight
properties. Use M2 screws and flat or spring washers to se-
cure the Sensor. (Tightening torque: 0.15 N·m max.)
Mounting the Sensor on Moving Parts
Cable Bending Rupture Test
(Tough Cable Breaking Test)
The cable is repeatedly bent with power supplied to check the
number of bends until the current is turned OFF
.
L
Adjusting
Indicators
• The following graphs indicate the status of each operating
level.
• Be sure to use the E3T within the stable operating range.
Use of E39-E10 Sensitivity Adjustment Unit
(Dark-ON: E3T-ST12)
1.
Mount the Unit on the Receiver.
2. Set the adjuster of the Sensitivity Adjustment Unit to Max.
(Before shipping: Max.)
3. After mounting on the Sensor, adjust the optical axis and
secure the Sensor.
4. Place a workpiece between the Emitter and Receiver and
gradually turn the adjuster counterclockwise toward the
Min. side. Stop turning the adjuster when the operation in-
dicator and stability indicator (green) turn ON.
5. Remove the workpiece and confirm that the operation in-
dicator is OFF and the stability indicator (green) is ON.
This completes the adjustment.
Note: If the light attenuation rate due to a workpiece is 40% or less, the stability
indicator will not turn ON whether or not light is received. When the vari-
ation of light is small such as when sensing semi-transparent workpiec-
es, carefully perform preliminary testing.
Others
Do not install the E3T in the following locations.
• Locations subject to excessive dust or dirt
• Locations subject to direct sunlight
• Locations subject to corrosive gas
• Locations subject to contact with organic solvents
• Locations subject to vibration and shock
• Locations subject to contact with water, oil, or chemicals
• Locations subject to high humidities that might result in
condensation
!
Warning
Precautions for Correct Use
Test
Specimen
Standard cable
2.4 mm dia. (7/
0.127 mm dia.),
3 conductors
Robotics cable
2.4 mm (20/
0.08 mm dia.),
Test 3 conductors
Con-
tents/
condi-
tions
Bending
angle (
θ
)
90° each to the left and right
Bending speed 50 times/min
Load
200 g
Operation per
bend
Once in 1 to 3 in the diagram
Curvature radi-
us of support
point (R)
5 mm
Result
Approx. 14,000
times
Approx. 400,000
times
Weight
R
A
C
B
Consider models that use break resistant ca-
bles (e.g., Robotics Cables) if the Sensor
will be mounted on a moving part, such
as a robot hand. The flexing resistance of
Robotics Cable at approximately 400 thou-
sand times is far superior to that of standard
cable at approximately 14 thousand times.
Stable
operation
range*
Stable
operation
range*
Unstable
operation
range*
Operating
level x 1.2
Operating
level x 0.8
Operating
level
Light
ON
ON
ON
ON
OFF
OFF
OFF
Stability
indicator
(green)
Operation indicator (orange)
E3T-
@@@
1
E3T-
@@@
3
E3T-
@@@
2
E3T-
@@@
4
*If the E3T fs operating level is set to the stable operation range, the E3T
will be in most reliable operation without being influenced by temperature
change, voltage fluctuation, dust, or setting change. If the operating level
cannot be set to the stable operation range, pay attention to environmental
changes while operating the E3T.
Indicator
Adjuster
(At Min)
(At Center)
(At Max.)
