Datasheet

SA1U Photoelectric Switches
11
Indicator and Output Operation
SENS.
L-OND-ON
Operation LED (yellow)
Stable LED (green)
The operation LED turns on (yellow) when the control output is on.
The stable LED turns on (green) either at stable incident or stable
interruption. Make sure to use the SA1U photoelectric switch after
the stable LED is on.
See the table below.
Light
Receiving
Status
Stable
LED
(green)
Operation LED (yellow)/
Control Output
Light ON Dark ON
Stable
Incident
ON
ON OFF
Unstable
Incident
OFF
Unstable
Interruption
OFF ON
Stable
Interruption
ON
Optical Axis Alignment (Light ON)
(1) Through-Beam Model
Fasten the receiver temporarily. Place the projector facing the
receiver. Move the projector up, down, right and left to find the
range where the operation LED turns on. Fasten the projector in
the middle of the range. Next, move the receiver up, down, right,
and left in the same manner and fasten in the middle of the range
where the operation LED turns on. Make sure that stable LED turns
on at stable incident and stable interruption.
1 2 3
Fasten temporarily
Up & down
Left & right
Projector
Receiver
Up & down
Left & right
(2) Polarized Retroreflective Model
Install the reflector perpendicularly to the optical axis. Move
the SA1U photoelectric switch up, down, right, and left to find
the range where the operation LED turns on. Fasten the switch
in the middle of the range. Polarized retroreflective model can
be installed also by finding the position where the reflection of
projected red light is most intense, while observing the reflection
on the reflector from behind the switch. Make sure that stable LED
turns on at stable incident and stable interruption.
(3) Diffuse-Reflective Model
Place the SA1U photoelectric switch where the switch can detect
an object. Move the switch up, down, right, and left to find the
range where the operation LED tuns on. Fasten the switch in the
middle of the range. Make sure that stable LED turns on at stable
incident and stable interruption.
Sensitivity Adjustment
(except Background Supression Model)
•Referring to the table below, adjust the sensitivity of the SA1U
photoelectric switch when necessary, such as when the through-
beam model is used to detect small or translucent objects or the
reective model is affected by background. The table explains the
status of operation LED when the operation mode is set to light
ON.
•After adjusting the sensitivity, make sure that stable LED turns on
at stable incident and stable interruption.
•
Sensitivity is set to the maximum at the factory before shipment.
When adjusting the sensitivity, use the screwdriver supplied with
the SA1U photoelectric switch to turn the control as shown below,
to a torque of 0.03 N·m maximum.
Step
Photoelectric
Switch Status
Sensitivity
Control
Adjusting Procedure
1
Receiving light
•
Through-beam,
polarized reflec-
tive:
No object detected
•Diffuse reective:
Object detected
A
min. max.
Turn the control counterclockwise
to the minimum. Then turn clockwise
until the operation LED turns on (turns
off with dark ON type) (point A).
2
Light is interrupted
•
Through-beam,
polarized reflec-
tive: Object
detected
•
Diffuse reflective:
No object detect-
ed
A
B
min. max.
At interruption status, turn the
control clockwise from point A, until
the operation LED turns on (turns off
with dark ON type) (point B).
If the operation LED does not turn
on (turn off with dark ON type) even
though the control has reached the
maximum, set the maximum position
as point B.
3
—
A
C
B
min. max.
Set the middle point between point A
and B as point C.
Adjustment of Sensing Range for
Background Suppression
When adjusting the sensing range, follow the instruction below.
Step Distance Control Adjusting Procedure
1
A
DIST.
Install the photoelectric switch and the object rmly.
Turn the control counterclockwise until the operation
LED turns off (turns on with dark ON type). From this
point, turn the control clockwise until the operation
LED turns on (turns off with dark ON type) (point A).
2
DIST.
A
B
Remove the object, and conrm that the operation
LED turns off (turns on with dark ON type). Turn the
control clockwise until the operation LED turns on
(detecting the background) (turns off with dark ON
type) (point B). (Note 1)
3
DIST.
A
C
B
Set the middle point between point A and B
as point C. (Note 2)
Note 1: When the background distance is too far and not detected,
turn the control 360°, and set the point as point C.
Note 2: Because the control is multi-turn, it may take more than
one turn to move from point A to point B.
DIST.
L-ON D-ON
Operation LED (yellow)
Distance Control (Note 3)
Note 3: Turning the control clockwise lengthens the sensing
distance.
Note 4: Background suppression (BGS) model is not provided with
a stable LED.
Instructions