Other functions, Error indications and remedies, Operation mode selection – KEYENCE AP-40A Series User Manual
Page 3
3
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OPERATION MODE SELECTION
■
Auto-tuning mode (F-1)
Using the AUTO key, detect the upper limit value (A) and the lower
limit value (b). The detection level (C) is automatically set at the
midpoint between the two values. (You can finely adjust the preset
value C within the range between A and b.)
Control output 1: The sensor turns on when the pressure exceeds the
preset value C.
Control output 2: The sensor turns on when the pressure goes outside
the stability levels.
* The stability levels are
automatically set as
shown in the following
calculations.
■
Hysteresis mode (F-2)
Set desired detection level (H) and hysteresis (h) for the detection.
Control output 1: The sensor turns on when the pressure exceeds the
preset value H. When the pressure falls by the preset
value h, the sensor turns off.
Control output 2: The sensor turns on when the pressure goes outside
the hysteresis width (H - h).
h: Hysteresis width of
OUT1
* When h is set to a
value close to 0, if
pressure fluctuates
around the detection
point, OUT1 will
chatter.
■
2-independent mode (F-3)
Set two desired detection points (A and B).
Control output 1: The sensor turns on when the pressure exceeds the
preset value A.
Control output 2: The sensor turns on when the pressure exceeds the
preset value b.
■
Window mode (F-4)
Set desired upper limit value (H) and lower limit value (L).
Control output 1: The sensor turns off when the pressure goes outside
of the range between the upper limit value (H) and
lower limit value (L).
Control output 2: The sensor turns off when the pressure goes outside
of the stability levels.
* The stability levels are
automatically set as
shown in the following
calculations.
Note 1: The above description shows the operation of control outputs
1 and 2 when the output selector switch is set to N.O.
When the output selector switch is set to N.C., the operation of control
outputs 1 and 2 is inverted.
Note 2: Except for OUT1 in hysteresis mode, each control output
includes an internal hysteresis of 0.5% of F.S.
A
SH
Preset value C
SL
b
0
ON
OFF
ON
OFF
Control output 1
(OUT 1)
Control output 2
(OUT 2)
Pressure
SH =
(A + C)
2
SL =
(C + b)
2
Preset value H
H-h
0
ON
OFF
ON
OFF
Control output 2
(OUT 2)
h
Control output 1
(OUT 1)
Pressure
Preset value A
Preset value b
0
ON
OFF
ON
OFF
Control output 2
(OUT 2)
Control output 1
(OUT 1)
Pressure
Preset value H
SH
SL
Preset value L
0
ON
OFF
ON
OFF
Control output 1
(OUT 1)
Control output 2
(OUT 2)
Pressure
SH = H –
(H - L)
4
SL = L +
(H - L)
4
OTHER FUNCTIONS
■
Zero-shift function (AP-40RA/40ZA type only)
The zero-shift function is used to reset the current pressure value to
“0” using an external signal input, in order to prevent measurements
from being affected by fluctuations in base pressure.
Example: Leakage test
Input a zero-shift value after
air supply is completed so
that air leakage after a
specified time is displayed
as a negative value. The
AP-40A’s detection is
unaffected by fluctuations in air supply volume.
When the power is turned off, the value updated after the zero-shift
input (zero-shift value) is lost.
Note 1: The zero-shift function cannot be used in auto-tuning mode.
Note 2: The zero-shift input is effective when the current pressure is
between -3% of F.S. and 100% of F.S. for a shift of 0 (P = 0).
Note 3: If the applied pressure is outside the range of -15% to 110% of
the rated pressure, “
-FFF
” or “
FFF
” appears.
Note 4: The display range for the zero-shift focus mode is
±
19.9%.
When the pressure value is out of this range, “
-FF
” or “
FF
” is dis-
played.
■
Analog output function
(AP-40A only)
The voltage value according to the
pressure value is output.
■
Peak-hold/bottom-hold display function
The AP-40A Series internally updates the peak-hold and bottom-hold
values at all times.
●
To display hold values
• While
▲
is held down in measurement mode, the peak-hold value
is displayed.
• While
▼
is held down in measurement mode, the bottom-hold
value is displayed.
●
To reset the peak-hold and bottom-hold values
• Hold down
▲
and press
▼
in measurement mode.
●
The peak-hold and bottom-hold values are also reset using the
following procedure.
• Turn the power off.
• Press
for 3 seconds or more and change any settings.
Note: The hold values cannot be displayed when the front panel keys
are locked with the key protection function. Disable the function before
displaying the hold values.
■
Key protection
The key protection function is used to lock the front panel key in order
to prevent preset values from being accidentally changed.
To enable the key protection function, hold down
A
and press
▲
.
“
Loc
” flashes for 2 seconds and the keys are locked.
To disable the key protection function, again hold down
A
and press
▼
. “
unL
” flashes for 2 seconds and the keys are unlocked.
Using the EEPROM, the AP-40A Series can retain the preset values
even if the power is turned off.
■
Display color selection
You can set the color of the LED display either to the two-color mode
which displays the numerical value in green or red according to OUT1,
or to the single color mode which always shows the value in red or
green. The two-color display allows you to check the output condition
at a glance. (Refer to “ADJUSTMENT” on page 4 for the setting
procedure.)
In two-color mode (
2-[
) (Regardless of N.O./N.C. selection)
• When OUT1 is turned on: Red
• When OUT1 is turned off: Green
1 MPa
Atmospheric
pressure
Zero-shift input
Zero-shift input
-0.1 MPa is
acceptable.
-0.6 MPa is
not acceptable.
V
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–
ERROR INDICATIONS AND REMEDIES