Datasheet

FIBER
SENSORS
LASER
SENSORS
PHOTO-
ELECTRIC
SENSORS
MICRO
PHOTO-
ELECTRIC
SENSORS
AREA
SENSORS
SAFETY
COMPONENTS
PRESSURE
SENSORS
INDUCTIVE
PROXIMITY
SENSORS
PARTICULAR
USE
SENSORS
SENSOR
OPTIONS
WIRE-
SAVING
SYSTEMS
MEASURE-
MENT
SENSORS
STATIC
CONTROL
DEVICES
LASER
MARKERS
PHOTO-
ELECTRIC
SENSORS
Selection
Guide
Amplifier
Built-in
EX-10
CX-400
EX-20
EX-30
EX-40
EQ-30
EQ-500
MQ-W
RX-LS200
RX
CY
PX-2
RT-610
Amplifier-
separated
Power Supply
Built-in
NX5
VF
SU-7 / SH
SS-A5 / SH
Other
Products
EX-20
Amplifi er
Built-in
Ultra-compact Photoelectric Sensor EX-20 SERIES
278
PRECAUTIONS FOR PROPER USE
Refer to p.986 ~ for general precautions.
Stability indicator
The stability indicator (green) lights up when the incident
light intensity has suffi cient margin with respect to the
operation level.
If the incident light intensity level is such that the stability
indicator lights up, stable sensing can be done without
the light received operation and the light interrupted
operation being affected by a change in ambient
temperature or supply voltage.
•
M3 screws
Mounting
Mount using M3 screws. The tightening torque should be
0.5 N·m or less.
•
Front sensing Side sensing
M3 pan head screws (Note)
M3 screws
Note: When mounting the front sensing type sensor, use M3 pan head
screws without washers, etc.
When mounting the front sensing type from the backside,
fi t the mounting spacer (MS-EX20-FS) and fi x with screws.
•
1
Fit the mounting
spacer on the sensor.
2
Align the mounting holes of
the mounting spacer and the
sensor and mount with M3
screws. The tightening torque
should be 0.5 N
· m or less.
Mounting
spacer (Optional)
Sensitivity adjustment (side sensing type only)
Step Sensitivity adjuster Description
1
MAX
Turn the sensitivity adjuster fully counterclockwise to
the minimum sensitivity position (
•
mark).
2
MAX
A
In the light received condition, turn the sensitivity
adjuster slowly clockwise and confi rm the point
A
where the sensor enters the “Light” state operation.
3
MAX
A
B
In the dark condition, turn the sensitivity adjuster further
clockwise until the sensor enters the “Light” state operation
and then bring it back to confi rm point
B
where the sensor
just returns to the “Dark” state operation.
If the sensor does not enter the “Light” state operation even when the
sensitivity adjuster is turned fully clockwise, this extreme position is point
B
.
4
MAX
A
B
Optimum position
The position at the middle of points
A
and
B
is the
optimum sensing position.
Notes: 1) Use the attached adjusting screwdriver to turn the adjuster slowly.
Turning with excessive strength will damage the adjuster.
2) In case of using EX-22□ at a sensing distance of 50 mm 1.969 in or less,
take care that the sensitivity adjustment range becomes extremely narrow.
Operation mode switch (EX-23□ only)
Switch
position
Description
L
D
Light-ON mode is obtained when the operation mode switch
(located on the receiver) is turned fully clockwise (L side).
L
D
Dark-ON mode is obtained when the operation mode switch
(located on the receiver) is turned fully counterclockwise (D side).
Note: Operation mode switch should be turned fully till it stops.
Mounting method
Operation of stability indicator
Output operation
Incident
light
margin
Light
interruption
margin
Output
operation
level
Lights off
0
100
0
Incident light intensity (%)
Setting distance
Lights up
Light interrupted
operation
Lights up
15 % approx.
25 % approx.
Light received
operation
Glossy object sensing (EX-29□)
Please take care of the following points when detecting
materials having a gloss.
•
L
Make L sufficiently long
Sensor
10 to 30 °
Glossy surface
Sensing object
Reflector
Wiring
Excess bending of the cable or stress applied to the
cable may disconnect the internal lead wire.
•
1
Make L, shown in the diagram, suffi ciently long.
2
Install at an angle of 10 to 30 degrees to the sensing object.
Others
Do not use during the initial transient time (50 ms) after
the power supply is switched on.
If sensors are mounted close together and the ambient
temperature is near the maximum rated value, provide for
enough heat radiation / ventilation.
If a refl ective object is present in the background, the
sensing of EX-28□ may be affected. When setting the
sensor, make sure to confi rm that the refl ective object
has no effect. In case the refl ective object affects the
sensing, take measures such as removing the refl ective
object or coloring it in black, etc.
•
•
•
Never use this product as a sensing device
for personnel protection.
In case of using sensing devices for
personnel protection, use products which
meet laws and standards, such as OSHA,
ANSI or IEC etc., for personnel protection
applicable in each region or country.
•
•