KEYENCE LV-SA - Manual (Page 4)

4 E LV-S-IM
Setting Sensitivity
■ 2-point calibration
1
Press the SET button once without
a workpiece being placed.
2
Place a workpiece at the
designated position, and quickly
press the SET button once again.
* If the sensitivity difference does not have enough room, “++++” flashes after
the calibration is complete. The setting value is changed at this time, too.
■ Maximum sensitivity setting
Set the sensitivity without a workpiece in the case of the reflective type, and
with a workpiece in the case of the transmission type.
1
Press the SET button for three
seconds in the state as shown in
the figure on the left.
The indication flashes when the
setting is complete.
2
Release the SET button.
■ Full-auto calibration (not available for the LV-S31)
1
Let the workpiece pass while the SET
button is being pressed for three
seconds. (The sensitivity is set
according to the received light intensity
while the SET button is pressed.)
2
The indication flashes when the
setting is complete.
3
Release the SET button.
Perform 2-point calibration if the setting cannot be configured as desired.
■ Positioning calibration (not available for the LV-S31)
1
Press the SET button quickly
without a workpiece being placed.
2
Place a workpiece on the position
where you want to perform positioning.
3
Press the SET button for at least
three seconds. When the indication
flashes, release the button.
% calibration (not available for the LV-S31)
This is a calibration method that can set the setting value by percentage with
reference to the received light intensity at the time of sensitivity setting. For
example, if the target value is set to –10P, the setting value is determined 10%
lower than the received light intensity when the SET button is pressed.
By regularly performing external calibration from the device such as a PLC,
even a little sensitivity difference can be steadily detected.
Usage
1
When selecting the sensitivity
setting method (page 6, No. 5),
select the % calibration, and set
the target value of calibration.
(The value can be set by 1%.)
2
Taking the desired light intensity as
a reference (normally without a
workpiece), press the SET button.
* While the % calibration is in use, other calibrations (sensitivity setting) can-
not be used.
* The setting value is calculated based on the intermediate value between
MAX. and MIN. of the received light intensity while the SET button is being
pressed. The conditions in acquiring the sampling value can be changed
using the procedure to set the special modes (page 6).
■ Edge detection (not available for the LV-S31)
Detects the change in the received light intensity during a given period of time.
In the detection mode (page 6, No. 4), select the following edge detection
mode and the detection time.
Sensitivity setting
The sensitivity is set to maximum when the SET button is pressed once.
(If the SET button is pressed and held for a while, changes in the light inten-
sity during that period are ignored.)
Output status
■ External calibration
1
Select the external calibration with the menu switch.
2
Short-circuiting the pink wire 20 ms or more as follows for each model is
equivalent to pressing the SET button.
* LV-11SA/11SAP only
* The maximum number of times of writing is one million.
* Input is not accepted while setting any mode (page 6).
Fine-adjusting Sensitivity
The setting value can be directly changed by pressing the manual button.
1 2
Received light intensity
Setting value
Time
The value set at the intermediate point
between the received light intensity
measured when the SET button is pressed
for the first time and that measured when it
is pressed for the second time.
1
2
Reflective type
Transmission type
With no workpiece
With workpiece
Received light intensity
Setting value
Time
MAX
MIN
The value is set at the intermediate point
between the MAX value and the MIN value
of the received light intensity measured
while the SET button is pressed.
Received light intensity
Setting value
Time
The sensitivity is set at the point where
the value becomes ON exactly when a
workpiece comes to the point where you
want to position it.
Rising detection Detects the increase (rising edge) of
the received light intensity
Falling detection Detects the decrease (falling edge) of
the received light intensity
Rising/falling
(both-edge) detection Detects both the rising and falling
edges of the received light intensity.
Setting Operation
L-ON Always OFF. Turns ON only when the light intensity changes.
D-ON Always ON. Turns OFF only when the light intensity changes.
When “five-digit display” is set (page 6, No.9) for the number of digits
to be displayed for the received light intensity
1
Press the manual button quickly once, and check that the setting value flashes.
2
While the setting value is flashing, change the setting value with the
Manual button.
Brown*
Blue*
Pink
Brown*
Pink
Blue*
+V
0 V
+V
0 V
LV-11SA/12SA LV-11SAP/12SAP