Yokogawa Electric Corporation - TC10 - ENGINEERING MANUAL - PAG. 14
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).
[37] Ab2 - Alarm 2 function
Available:
When [36] AL2t is different from “nonE”.
Range:
0 to 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 [28] Ab1 parameter.
[38] 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 [36] AL2t is different from “nonE” or [36]
AL2t is different from “SE.br”.
Range:
-1999 to [39] AL2H engineering units.
[39] AL2H - For High and low alarms it is the high
limit of the AL2 threshold
- For band alarm it is high alarm threshold
Available:
When [36] AL2t is different from “nonE” or
[36] AL2t is different from “SE.br”.
Range:
From [38] AL2L to 9999 engineering units.
[40] AL2 - Alarm 2 threshold
Available:
When:
[36] AL2t = LoAb Absolute low alarm;
[36] AL2t = HiAb Absolute high alarm;
[36] AL2t = LodE Deviation low alarm (relative);
[36] AL2t = LidE Deviation high alarm (relative).
Range:
From [38] AL2L to [39] AL2H engineering units.
[41] HAL2 - Alarm 2 hysteresis
Available:
When [36] AL2t is different to “nonE” or [36] AL2t
is different from “SE.br”.
Range:
1 to 9999 engineering units.
Note:
For other details see [33] HAL1 parameter.
[42] AL2d - Alarm 2 delay
Available:
When [36] 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 [42] AL2d time but the
reset is immediate.
[43] AL2o - Alarm 2 enabling during Stand-by mode
and out of range indications
Available:
When [36] AL2t different from “nonE”.
Range:
0 =
Never;
1 =
During stand by;
2 =
During overrange and underrange;
3 =
During overrange, underrange and stand-by.
]
AL3 Group - Alarm 3 parameters
[44] AL3t - Alarm 3 type
Available:
Always.
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 to the Target set point if you are
using the ramp to set point function).
[45] Ab3 - Alarm 3 function
Available:
When [43] AL3t is different from “nonE”.
Range:
0 to 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 Ad3 equal to 5 (1+4) the alarm 3 will be
“not active at power up” and “Acknowledgeable”.
Note:
For other details see [29] Ab1 parameter.
[46] AL3L - For High and low alarms it is the low
limit of the AL3 threshold
- For band alarm, it is low alarm threshold
Available:
When [44] AL3t is different from “nonE” or [44]
AL3t is different from “SE.br”.
Range:
-1999 to [47] AL3H engineering units.
[47] AL3H - For High and low alarms it is the high
limit of the AL3 threshold
- For band alarm it is high alarm threshold
Available:
When [44] AL3t is different from “nonE” or [44]
AL3t is different from “SE.br”.
Range:
From [46] AL3L to 9999 engineering units.
[48] AL3 - Alarm 3 threshold
Available:
When:
• [44] AL3t = LoAb Absolute low alarm;
• [44] AL3t = HiAb Absolute high alarm;
• [44] AL3t = LodE Deviation low alarm (relative);
• [44] AL3t = LidE Deviation high alarm (relative).
Range:
From [46] AL3L to [47] AL3H engineering units.
