E3T

13

Safety Precautions

Refer to Warranty and Limitations of Liability.

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 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

M2-mounting Sensors: 0.15 N·m max

M3-mounting Sensors: 0.5 N·m max

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.

● 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 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.

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

WARNING

Precautions for Correct Use

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

Test

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 radius of

support point (R)

5 mm

Result

Approx. 14,000 times

Approx. 400,000 times

θ

θ

Weight

R

A

C

B

Stable

operation

Unstable

operation

Stable

operation

Operating

level x 1.2

Operating

level

Operating

level x 0.8

ON

ON

ON

ON

OFF

OFF

OFF

Stability

indicator

(green)

Operation indicator (orange)

E3T-

@@@1

E3T-

@@@3

E3T-

@@@2

E3T-

@@@4

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.)