Ascon Tecnologic - KM2 Line - ENGINEERING MANUAL - PAG. 11
[27] AL1L - For High and low alarms, it is the low
limit of the AL1 threshold
- For band alarm, it is low alarm threshold
Available:
When [25] AL1t is different from
nonE
or
[25] AL1t is different from
SE.br
.
Range:
From
-1999
to
[28] AL1H
engineering units.
[28] AL1H - For High and low alarms, it is the high
limit of the AL1 threshold
- For band alarm, it is the high alarm
threshold
Available:
When [25] AL1t is different from
nonE
or
[25] AL1t is different from
SE.br
.
Range:
From [
27] AL1L
to
9999
engineering units.
[29] AL1- Alarm 1 threshold
Available:
When:
[25] AL1t = LoAb - Absolute low alarm;
[25] AL1t = HiAb - Absolute high alarm;
[25] AL1t = LodE - Deviation low alarm (relative);
[25] AL1t = LidE - Deviation high alarm (relative).
Range:
From
[27] AL1L
to [
28] AL1H
engineering units.
[30] HAL1 - Alarm 1 hysteresis
Available:
When [25] AL1t is different from
nonE
or
[25] AL1t is different from
SE.br
.
Range: 1... 9999
engineering units.
Notes: 1.
The hysteresis value is the difference between
the Alarm threshold value and the point the Alarm
automatically resets.
2.
When the alarm threshold plus or minus the
hysteresis is out of input range, the instrument will
not be able to reset the alarm.
Example:
Input range 0... 1000 (mBar).
–
Set Point equal to 900 (mBar);
–
Deviation low alarm equal to 50 (mBar);
–
Hysteresis equal to 160 (mBar) the theoretical reSet Point is
900 - 50 + 160 = 1010 (mBar) but this value is out of range.
The reset can be made only by turning the instrument
OFF, removing the condition that generate the alarm and
then turn the instrument ON again.
–
All band alarms use the same hysteresis value for both
thresholds;
–
When the hysteresis of a band alarm is bigger than the
programmed band, the instrument will not be able to reset
the alarm.
Example:
Input range 0... 500 (°C).
–
Set Point equal to 250 (°C);
–
Relative band alarm;
–
Low threshold equal to 10 (°C);
–
High threshold equal to 10 (°C);
–
Hysteresis equal to 25 (°C).
[31] AL1d - Alarm 1 delay
Available:
When [25] AL1t is different from
nonE
.
Range: 0
oFF;
1... 9999
seconds.
Note:
The alarm goes ON only when the alarm condition
persists for a time longer than [31] AL1d time but the
reset is immediate.
[32] AL1o - Alarm 1 enabling during Stand-by mode
and out of range indications
Available:
When [25] AL1t is different from
nonE
.
Range: 0
Never;
1
During stand by;
2
During overrange and underrange;
3
During overrange, underrange and stand-by.
]
AL2 Group - Alarm 2 parameters
[33] AL2t - Alarm 2 type
Available:
Aways
Range: •
When one or more outputs are programmed as
control output:
nonE
Alarm not used;
LoAb
Absolute low alarm;
HiAb
Absolute high alarm;
LHAo
Absolute band alarm with alarm indication
out of the band;
LHAi
Absolute band alarm with alarm indication
inside the band;
SE.br
Sensor break;
LodE
Deviation low alarm (relative);
HidE
Deviation high alarm (relative);
LHdo
Relative band alarm with alarm indication
out of the band;
LHdi
Relative band alarm with alarm indication
inside the band;
•
When no output is programmed as control output;
nonE
Alarm not used;
LoAb
Absolute low alarm;
HiAb
Absolute high alarm;
LHAo
Absolute band alarm with alarm indication
out of the band;
LHAi
Absolute band alarm with alarm indication
inside the band;
SE.br
Sensor break.
Note:
The relative alarm are “relative” to the current Set
Point (this may be different from the Target Set Point if
you are using the ramp to Set Point function).
[34] Ab2 - Alarm 2 function
Available:
When [33] AL2t is different from
nonE
.
Range:
0... 15 with the following rule:
+1
Not active at Power ON;
+2
Latched alarm (manual reset);
+4
Acknowledgeable alarm;
+8
Relative alarm not active at Set Point change.
Example:
Setting Ad2 equal to 5 (1+4) the alarm 2 will be
“not active at Power ON” and “Acknowledgeable”.
Note:
For other details see [25] Ab1 parameter.
[35] AL2L - For High and low alarms, it is the low
limit of the AL2 threshold
-
For band alarm, it is low alarm threshold
Available:
When [33] AL2t is different from
nonE
or
[33] AL2t is different from
SE.br
.
Range: -1999
to
[36] AL2H
engineering units.
