Ascon Tecnologic - K Series - ENGINEERING MANUAL - Vr. 9.0
PAG. 12
LoAb = Absolute low alarm;
HiAb = Absolute high alarm:
LHAb = Absolute band alarm:
SE.br = Sensor break;
LodE = Deviation low alarm (relative);
HidE = Deviation high alarm (relative);
LHdE = Relative band alarm.
•
When no output is programmed as control output:
nonE = Alarm not used;
LoAb = Absolute low alarm;
HiAb = Absolute high alarm;
LHAb = Absolute band alarm;
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).
[41] Ab3 - Alarm 3 function
Available:
When [40] AL3t 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 Ad3 equal to 5 (1 + 4) the alarm 3 will be
“Not active at Power ON” and “Acknowledgeable”.
Note:
For other details see [25] Ab1 parameter.
[42] 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 [40] AL3t is different from
nonE
or
[40] AL3t is different from
SE.br
.
Range:
From - 1999 to [43] AL3H engineering units.
[43] 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 [40] AL3t is different from
nonE
or
[40] AL3t is different from
SE.br
.
Range:
From [42] AL3L to 9999 engineering units.
[44] AL3 - Alarm 3 threshold
Available:
When
- [40] AL3t = LoAb Absolute low alarm;
- [40] AL3t = HiAb Absolute high alarm;
- [40] AL3t = LodE Deviation low alarm (relative);
- [40] AL3t = LidE Deviation high alarm (relative).
Range:
From [42] AL3L to [43] AL3H engineering units.
[45] HAL3 - Alarm 3 hysteresis
Available:
When [40] AL3t is different from
nonE
or
[40] AL3t is different from
SE.br
.
Range:
1... 9999 engineering units.
Note:
For other details see [29] HAL1 parameter.
[46] AL3d - Alarm 3 delay
Available:
When [40] AL3t is 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 [46] AL3d time but the
reset is immediate.
[47] AL3o - Alarm 3 enabling during Stand-by mode
and out of range indications
Available:
When [40] AL3t ia different from
nonE
.
Range:
0 =
Never;
1 =
During stand by;
2 =
During overrange and underrange;
3 =
During overrange, underrange and stand-by.
]
LbA Group - Loop break alarm
General note about LBA alarm
The LBA operate as follows:
When you apply 100% of the power output to a process,
the process variable, after a time due to the process inertia,
begins to change in a known direction (increases for an
heating action or decreases for a cooling action).
Example:
If I apply 100% of the power output to a furnace,
the temperature must go up unless one of the
component in the loop is faulty (heater, sensor,
power supply, fuse, etc.).
The same philosophy can be applied to the minimum power.
In our example, when I turn OFF the power to a furnaces,
the temperature must go down, if not the SSR is in short
circuit, the valve is jammed, etc..
LBA function is automatically enabled when the PID requires
the maximum or the minimum power.
When the process response is slower than the programmed
limit the instrument generates an alarm.
Notes: 1.
When the instrument is in manual mode, the LBA
function is disabled.
2.
When LBA alarm is ON the instrument continue
to perform the standard control. If the process
response come back into the programmed limit,
the instrument reset automatically the LBA alarm.
3.
This function is available only when the program-
med control algorithm is equal to PID (Cont = PID).
[48] LbAt - LBA time
Available:
When [52] Cont = PID.
Range: •
oFF = LBA not used;
•
1... 9999 seconds.
[49] LbSt - Delta measure used by LBA during
Soft start
Available:
When [48] LbAt is different from oFF.
Range: •
oFF = loop break alarm is inhibit during soft start;
•
1... 9999 engineering units.
[50] LbAS - Delta measure used by loop break
alarm (loop break alarm step)
Available:
When [48] LbAt is different from oFF.
Range:
1... 9999 engineering units.
[51] LbcA - Condition for LBA enabling
Available:
When [48] LbAt is different from
oFF
.
Range:
uP =
Enabled when the PID requires the maxi-
mum power only.
dn =
Enabled when the PID requires the mini-
mum power only
both = Enabled in both condition (when the PID re-
quires the maximum or the minimum power).
