E3T Datasheet, PDF (14/21 Pages) Omron Electronics LLC – Photoelectric Sensor with Built-in Amplifier (Ultracompact and Thin Type)

Safety Precautions
Refer to Warranty and Limitations of Liability.
WARNING
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.
Precautions for Correct Use
Do not use the product in atmospheres or environments 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 voltage 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 1.5 times larger than the rated
load current. When using a capacitance load, be sure that the inrush
current will not exceed 1.5 times larger than the rated current.
● Mounting
When mounting the Sensor, never strike it with a heavy object, such
as a hammer. Doing so may reduce its watertight properties. Use M2
screws and flat or spring washers to secure the Sensor.
(Tightening torque: 0.15 N·m max.)
Mounting the Sensor on Moving Parts
Consider models that use break
resistant cables (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 thousand times is far
superior to that of standard cable at
approximately 14 thousand times.
B
A
C
θ
θ
R
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.
Weight
Test
Specimen
Standard cable
2.4-mm dia.
(7/0.127-mm
dia.),
3 conductors
Robotics cable
2.4-mm dia.
(20/0.08-mm
dia.),
3 conductors
Bending angle (θ) 90° each to the left and right
Bending speed 50 times/min
Con-
tents/
condi-
tions
Load
Operation per
bend
Curvature radius
of support point
(R)
200 g
Once in 1 to 3 in the diagram
5 mm
Result
Approx. 14,000 Approx. 400,000
times
times
E3T
● Adjusting
Indicators
• The following graphs indicate the status of each operating level.
• Be sure to use the E3T within the stable operating range.
Stable
operation
range*
Unstable
operation
range*
Stable
operation
range*
Operating
level x 1.2
Operating
level
Operating
level x 0.8
Stability
indicator
(green)
ON
OFF
ON
Operation indicator (orange)
E3T-@@@1 E3T-@@@2
E3T-@@@3 E3T-@@@4
ON
OFF
OFF
ON
*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 environmen-
tal changes while operating the E3T.
Use of E39-E10 Sensitivity Adjustment Unit
(Dark-ON: E3T-ST12)
(At Min) (At Center) (At Max.)
Indicator
Adjuster
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 indicator and stability
indicator (green) turn ON.
5. Remove the workpiece and confirm that the operation indicator 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
variation of light is small such as when sensing semi-transparent
workpieces, 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
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