
Ascon Tecnologic - KM2 Line - ENGINEERING MANUAL - PAG. 13
]
Hbd group - Heater break down alarm
General note about HBD alarm
The HBD alarm operate as follows: The instrument perform
the measurement of the current running in a load. This
measurement is made by a current transformer (CT) with a
0.05 A A.C. full scale output.
The load can be: independent (not managed by an output
of the KM2) or managed by an output of the KM2. In the
first condition (independent), the instrument will perform the
current measurement continuously and it will compare the
measured value with 3 thresholds: a minimum alarm (Ct.LE),
a maximum alarm (Ct.Ld) and an over-current alarm(Ct.oc).
In the second condition (load manage by an output of the
KM2) the instrument is able to identify the load condition (ON
or OFF) and manages the thresholds according to the status.
When the out (used to turn ON and OFF the load) is OFF,
the measured value is used to verify that the leakage current
is lower than a preset value (Ct.LE = leakage current) in
order to be sure that the actuator disconnect the output.
When the out (used to turn ON and OFF the load) is ON,
the measured value is used to verify that the load current is
higher than a preset value (Ct.Ld = load current) but also it
must be lower of the over-current threshold (Ct.oc) in order
to verify that the load operate correctly.
[49] Ct.So - Current transformer source
Available:
Always.
Range: oFF
HBD not used;
nonE
The load is independent;
out 3
The load is driven by Out 3;
out 2
The load is driven by Out 2;
out 1
The load is driven by Out 1
(for digital output type only).
[50] Ct.dF - Current transformer decimal figure
Available:
When [49] Ct.So is different from
oFF
.
Range:
1... 3.
[51] Ct.rA - Current transformer range
Available:
When [49] Ct.So is different from
oFF
.
Range:
1... 999 Ampere.
[52] Ct.FL - Current transformer filter
Available:
When [49] Ct.So is different from
oFF
.
Range: no
Filter disabled;
YES
Filtter enabled.
[53] Ct.LA - Current transformer latch
Available:
When [49] Ct.So is different from
oFF
.
Range: 0
Automatic reset;
+1
Manual reset;
+2
Acknowledgeable.
[54] Ct.Ld - Load current threshold
Available:
When [49] Ct.So is different from
oFF
.
Range: 0
Disabled
1... 999
Ampere.
[55] Ct.LE - Leakage current threshold
Available:
When [49] Ct.So is different from
oFF
.
Range: 0
Disabled
1... 999
Ampere.
[56] Ct.oc - Over current threshold
Available:
When [49] Ct.So is different from
oFF
.
Range: 0
Disabled
1... 999
Ampere.
]
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).
[57] 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 a control action (heat/cool) is programmed:
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 > SP;
•
ON when PV < (SP - hysteresis).
2.
ON/OFF control with symmetric hysteresis:
•
OFF when PV > (SP + hysteresis);
•
ON when PV < (SP - hysteresis).
[58] Auto - Auto tune selection
Ascon Tecnologic has developed three auto-tune algorithms:
–
Oscillating auto-tune;
–
Fast auto-tune;
–
EvoTune.
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
is suitable when:
•
The process is very slow and you want to be opera-
tive in a short time;
•
When an overshoot is not acceptable;
•
In multi-loop machinery where the fast method reduces
the calculation error due to the effect of the other loops.
3.
The
EvoTune
type is suitable when:
•
You have no information about your process;
•
You can not be sure about the end user skills;