Sensitivity Setting - Panasonic SU-7 Series Manual

12
Slim Body Automatic Sensitivity Setting Photoelectric Sensor
PRECAUTIONS FOR PROPER USE
Amplifier
Wiring
• The self-diagnosis output does not incorporate a short-
circuit protection circuit. Do not connect it directly to a
power supply or a capacitive load.

Sensitivity setting

● Normal sensitivity setting
Standard setting
The sensor recognizes the ON (object present) and OFF (object absent) levels by your pressing
of the buttons. The threshold level is automatically set
While detecting
an object
Without
detecting
an object
● Maximum sensitivity setting
Full power setting
The maximum sensitivity is set. Take
care that, in case of the diffuse reflective
type, if a background object is present,
the sensing output may turn ON even
without the sensing object.
*How to set sensitivity with external inputs
Remote sensitivity setting (SU-77 only)
Instead of pressing buttons, the sensitivity can be set with
sensitivity setting inputs. (There is no external sensitivity shift mode.)
Setting procedure
The procedure is the same as for setting with sensitivity buttons, except that
instead of pressing the buttons, the remote sensitivity setting input wire is short-
circuited to 0 V. The mode selection switch is set to either the "SET" or "RUN" side.
• Time chart
The self-diagnosis output stays ON for 40 ms approx. after
ON input or OFF input is recognized by the sensor.
If the difference between the ON and OFF levels (the difference
between incident light levels) is so small that stable detection is
not possible, it does not turn ON.
Power supply
Remote sensitivity ON
input
Remote sensitivity OFF
input
Self-diagnosis output
(Answer back function)
Sensing output
T ≥ 1,000 ms, 3,000 ms > T
1
Notes: 1) Signal condition ... Low: 0 to 1 V, High: 4.5 to 30 V, or open Input impedance: 10 kΩ
2) Do not move the object, etc., or change the incident light intensity during T
at the middle between ON and OFF levels.
ON input
Threshold
level
OFF input
High
Low
the remote
Self-diagnosis output
Orange
Sensing output
Black
+V
Brown
0 V
Blue
Remote sensitivity ON input
Pink
Remote sensitivity OFF input
Violet
ON
OFF
High
T T
1 2
Low
High
T T
5 2
Low
ON
T T
3 3
(Note 2) (Note 2)
OFF
T
4
≥ 5 ms, T ≈ 310 ms, T ≈ 40 ms, T
2 3 4 5
SU-7
SERIES
● Sensitivity for detecting minute differences
Setting for minute detection is possible just
a button once without the object being
For detecting
a tiny object
Setting procedure
By pressing either ON or OFF button for 3 sec. or more, the threshold level is
set 15 % either lower or higher
than the object absent level as
shown in the right figure.
Please note that the output
operation cannot be reversed.
For example, press the ON
button for detecting a tiny object.
● For applications in which beam intensity fluctuates
If the incident light is stable in either the object present or object absent
state, by shifting the threshold level towards this state, stable sensing
Threshold
is possible even if the incident light is unstable in the other state.
level
The setting level is the same as for limit sensitivity setting. However,
since the operating level is shifted after the normal sensitivity setting,
output operation is selectable.
Setting procedure
Press the sensitivity setting button which was pressed in the stable
light received condition. For example, for a diffuse reflective type
sensor, in case a background object is present, press the button
which was pressed with only the background object being sensed.
Background
Remote sensitivity selection function (SU-79 only)
• SU-79 can store four channels of sensitivity levels, which
can be selected as per your requirement.
Designate the channel that is to store the sensitivity by
making the remote sensitivity selection inputs 1 and 2
suitably High or Low.
Wiring
Signal condition
Low: 0 to 1 V
T
4
High: 4.5 to 30 V, or open
Sensing
possible
Input impedance: 10 kΩ
≥ 500 ms
.
3
SH
SERIES
Limit sensitivity setting
present.
For stable detection of an object
without detecting the background
Background
OFF ON
15 %
100 %
15 %
ON OFF
0
Press OFF button for 3 sec. or more
Press ON button for 3 sec. or more
Sensitivity shift
Stable Unstable
light intensity light intensity
ON
OFF 100 %
0
Self-diagnosis output
Orange
Sensing output
Black
+V
Brown
0 V
Blue
Remote sensitivity selection input 1
Pink
Remote sensitivity selection input 2
Violet
Channel selection
Input
Remote sensitivity
selection input 1
Channel
1
2
3
4
by pressing
Threshold
level
Object absent
level
Threshold
level
ON input
Threshold level
before shift
Shift
Threshold level
after shift
15 % approx. OFF input
Remote sensitivity
selection input 2
Low Low
Low High
High Low
High High