Ascon Tecnologic - K Series - ENGINEERING MANUAL - Vr. 9.0
PAG. 13
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 the 100% of the 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
The rEG group will be available only when at least one
output is programmed as control output (H.rEG or C.rEG).
[52] 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
and
cool) are
programmed:
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
HEAt - On.FS
OUT
H.rEG
SP
PV
HSEt
HSEt
time
HEAt - On.FA
OUT
H.rEG
SP
PV
HSEt
time
off
off
C ooL - O n.FS
OUT
H.rEG
SP
PV
HSEt
HSEt
time
C ooL - O n.FA
OUT
C.rEG
SP
PV
HSEt
time
ON
ON
ON
ON
ON
ON
off
off
off
off
off
off
ON
ON
ON
ON
ON
ON
Notes: 1.
ON/OFF control with asymmetric hysteresis:
- OFF when PV
☺²
SP;
- ON when PV
±
(SP - hysteresis).
2.
ON/OFF control with symmetric hysteresis:
- OFF when PV
²
(SP + hysteresis);
- ON when PV
±
(SP - hysteresis).
[53] Auto - Auto tune selection
Ascon Tecnologic has developed two auto-tune algorithms:
1.
The
oscillating auto-tune
is the usual auto-tune and:
•
It is more accurate;
•
Can start even if PV is close to the set point;
•
Can be used even if the set point is close to the ambient
temperature.
2.
The
fast type auto-tune
is suitable when:
•
The process is very slow and you want to be operative
in a short time;
•
When an high overshoot is not acceptable;
•
In multi loop machinery where the fast method reduces
the calculation error due to the effect of the other loops.
Note:
Fast auto-tune can start only when the measured
value (PV) is lower than (SP + 1/2SP).
Available:
When [49] cont = PID
Range:
From -4 to 4 where:
-4 =
Oscillating auto-tune with automatic restart
at Power ON (after soft start) and after
all
set point change;
-3 =
Oscillating auto-tune with manual start;
-2 =
Oscillating auto-tune with automatic start at
the first Power ON only;
-1 =
Oscillating auto-tune with automatic restart
at every Power ON;
0 =
Not used;
1 =
Fast auto tuning with automatic restart at
every Power ON;
2 =
FAST auto-tune with automatic start at the
first Power ON only;
3 =
FAST auto-tune with manual start;
4 =
FAST auto-tune with automatic restart at
Power ON (after soft start) and after a set
point change.
Note:
The auto-tune is inhibited during program execution.
[54] Aut.r - Manual start of the auto-tune
Available:
When [52] cont = PID.
Range:
oFF = The instrument is not performing the auto-tune;
on = The instrument is performing the auto-tune.
[55] SELF - Self-tune enable
The self-tuning is an adaptive algorithm able to optimize
continuously the PID parameter value.
This algorithm is specifically designed for all process
subjected to big load variation able to change heavily the
process response.
Available:
When [52] cont = PID.
Range:
YES = Self-tune active;
on =
Self-tune not active.
[56] HSEt - Hysteresis of the ON/OFF control
Available:
When [52] cont is different from PID.
Range:
0... 9999 in engineering units.
[57] cPdt - Time for compressor protection
Available:
When [52] cont = nr.
Range:
OFF = Protection disabled;
1... 9999 seconds.
[58] Pb - Proportional band
Available:
When [52] cont = PID and [55] SELF = no.
Range:
1... 9999 engineering units.
Note:
Auto-tune functions calculate this value.
