Safety Precautions; Precautions For Correct Use - Omron E3T-C Datasheet

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 26.4 VDC. Before turning the
power ON, make sure that the power supply voltage be 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
screws with spring, flat, or toothed washers to secure the Sensor.
Tightening Torque
Small Cylindrical Sensors: 1 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.
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.
Specimen
Test
Bending angle () 90 each to the left and right
Bending speed 50 times/min
Con-
tents/ Load 200 g
condi-
Operation per bend Once in 1 to 3 in the diagram
tions
Curvature radius of
5 mm
support point (R)
Result Approx. 14,000 times Approx. 400,000 times
E3T-C
B
A
θ θ
R
Weight
Standard cable Robotics cable
2.4-mm dia. 2.4-mm dia.
(7/0.127-mm dia.), (20/0.08-mm dia.),
3 conductors 3 conductors
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
*
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.
E3T-CD@@ Sensitivity Adjustment
Use the special screwdriver that is provided with the Sensor to adjust
the sensitivity. Do not exceed 0.8 N·m when turning the adjuster.
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
C
Stability
Operation indicator (orange)
indicator
E3T-@@@1
(green)
E3T-@@@3
ON
ON
Operating
level x 1.2
OFF
Operating
level
Operating
level x 0.8
OFF
ON
E3T-@@@2
E3T-@@@4
OFF
ON
5