Ascon Tecnologic - KX Line - ENGINEERING MANUAL -Vr.4.0
PAG. 13
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).
[33] AL1d - Alarm 1 delay
Available:
When [27] AL1t is different from “nonE”.
Range:
From oFF (0) to 9999 seconds.
Note:
The alarm goes ON only when the alarm condition
persists for a time longer than [33] AL1d time but the
reset is immediate.
[34] AL1o - Alarm 1 enabling during Stand-by
mode and out of range indications
Available:
When [27] 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
[35] 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 setpoint if you
are using the ramp to set point function).
[36] Ab2 - Alarm 2 function
Available:
When [35] AL2t is different from “nonE”
Range:
0... 15 with the following rule:
+1 =
Not active at power up.
+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 up” and “Acknowledgeable”.
Note:
For other details see [27] Ab1 parameter.
[37] AL2L - For High and low alarms, it is the low
limit of the AL2 threshold
- For band alarm, is low alarm threshold
Available:
When [35] AL2t is different from “nonE” or [35]
AL2t is different from “SE.br”.
Range:
-1999 to [38] AL2H engineering units.
[38] AL2H - For High and low alarms, it is the high
limit of the AL2 threshold
- For band alarm is high alarm threshold
Available:
When [35] AL2t is different from “nonE” or
[35] AL2t is different from “SE.br”.
Range:
From [37] AL2L to 9999 engineering units.
[39] AL2 - Alarm 2 threshold
Available:
When:
[35] AL2t = LoAb Absolute low alarm
[35] AL2t = HiAb Absolute high alarm
[35] AL2t = LodE Deviation low alarm (relative)
[35] AL2t = LidE Deviation high alarm (relative)
Range:
From [37] AL2L to [38] AL2H engineering units.
[40] HAL2 - Alarm 2 hysteresis
Available:
When [35] AL2t is different to “nonE” or [35] AL2t
is different from “SE.br”.
Range:
1... 9999 engineering units.
Note:
For other details see [32] HAL1 parameter.
[41] AL2d - Alarm 2 delay
Available:
When [35] AL2t different form “nonE”.
Range:
From oFF (0) to 9999 seconds.
Note:
The alarm goes ON only when the alarm condition
persist for a time longer than [41] AL2d time but the
reset is immediate.
[42] AL2o - Alarm 2 enabling during Stand-by mode
and out of range indications
Available:
When [35] AL2t different from “nonE”.
Range:
0 =
Never
1 =
During stand by
2 =
During overrange and underrange
3 =
During overrange, underrange and stand-by
