Ascon Tecnologic - KX 6 - ENGINEERING MANUAL - Vr. 0.1
PAG. 10
[29] 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 [27] AL2t is different from
nonE
or
[27] AL2t is different from
SE.br
.
range:
-1999 to [30] AL2H engineering units.
[30] 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 [27] AL2t is different from
nonE
or
[27] AL2t is different from
SE.br
.
range:
From [29] AL2L to 9999 engineering units.
[31] AL2 - Alarm 2 threshold
Available:
When:
[27] AL2t = LoAb Absolute low alarm;
[27] AL2t = HiAb Absolute high alarm;
[27] AL2t = LodE Deviation low alarm (relative);
[27] AL2t = LidE Deviation high alarm (relative).
range:
From [29] AL2L to [30] AL2H engineering units.
[32] HAL2 - Alarm 2 hysteresis
Available:
When [27] AL2t is different to
nonE
or
[27] AL2t is different from
SE.br
.
range:
1... 9999 engineering units.
note:
For more details see [24] HAL1 parameter.
[33] AL2d - Alarm 2 delay
Available:
When [27] AL2t 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 [33] AL2d time but the
reset is immediate.
[34] AL2o - Alarm 2 enabling during Stand-by mode
and out of range indications
Available:
When [27] AL2t 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 operates as follows: applying the 100% of the power
output to a process, the process variable should change (with a
delay due to the process inertia) in a known direction (increases
for a heating action or decreases for a cooling action). If this
does not happen, the LBA alarm is generated.
example:
Applying the 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 is applied to the minimum power. In our example,
when the furnace power is turned down to 0%, the tempera-
ture must go down, if not the SSR is in short circuit, the valve
is jammed, and so on. So the LBA should be generated.
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 continues
to perform the standard control. If the process
response comes back into the programmed limit,
the instrument automatically resets the LBA alarm.
[35] LbAt - LBA time
Available:
Always.
Range: •
oFF = LBA not used;
•
1... 9999 seconds.
[36] LbSt - Delta measure used by LBA during Soft
start
Available:
When [35] LbAt is different from
oFF
.
Range: •
oFF = loop break alarm is inhibit during soft start;
•
1... 9999 engineering units.
[37] LbAS - Delta measure used by loop break alarm
(loop break alarm step)
Available:
When [35] LbAt is different from
oFF
.
range:
1... 9999 engineering units.
[38] LbcA - Condition for LBA enabling
Available:
When [35] LbAt is different from
oFF
.
range: up
=
Enabled when PID requires the maximum
power only;
dn
=
Enabled when PID requires the minimum
power only;
both
= Enabled in both condition (when PID re-
quires the maximum or the minimum power).
LBA application example:
LbAt (LBA time) = 120 seconds (2 minutes);
LbAS (delta LBA) = 5°C.
The machine has been designed in order to reach 200°C in
20 minutes (20°C/min).
When the PID demands 100% power, the instrument starts
the time count.
During time count if the measured value increases more
than 5°C, the instrument restarts the time count. Otherwise
if the measured value does not reach the programmed delta
(5°C in 2 minutes) the instrument will generate the alarm.
]
reg group - Control parameters
[39] cont - Control type
Available:
When at least one output is programmed as con-
trol output (H.rEG or C.rEG).
Range: •
When two control actions (heat & cool) are pro-
grammed:
pid
=
PID (heat and cool);
nr
=
Heat/Cool ON/OFF control with neutral zone;
HSEt
HSEt
SP
PV
time
OUTH.rEG
(heating)
OUTc.rEG
(cooling)
off
ON
ON
off
off
ON
•
When one control action (heat or cool) is pro-
grammed:
pid
=
PID (heat or cool);
on.FA
= ON/OFF asymmetric hysteresis;
on.Fs
= ON/OFF symmetric hysteresis;
3pt
=
Servomotor control.
