DATALOGIC AUTOMATION - TH-TS series
– INSTRUCTION MANUAL - Rev. 04 - PAGE 5
Examples with starts from values lower than SP and with decreasing
of SP.
4.9 - SOFT-START FUNCTION
All the parameters referring to the Soft -Start functioning are
contained in the group
“
]
rEG”.
The Soft-Start function only works through PID control and allows
the limitation of control power when the instrument is switched on, for
a programmable period of time.
This is useful when the actuator, driven by the instrument, may be
damaged excess power supplied when the application is not yet in
the normal rating. (ex. for certain heating elements).
The function depends on the following parameters :
“St.P”
– Soft-Start power
“Sst”
– Soft-Start time (expressed in hh.mm)
The possible function modes are the following :
1)
If both parameters are programmed with values other than OFF,
when switched on the instrument gives an output power as
programmed on par. “St.P” for the time programmed on par. “SSt”.
Practically, the instrument works in manual condition and switches to
automatic control at the elapsing of time “SSt”.
It is advisable not to program a power “St.P” that is too high as the
function is not deactivated when the automatic control power is
found to be lower than the programmed one.
2)
If par. “St.P” = OFF and a value is set on par. “SSt” , at the switch
on, the power calculated by the PID controller is divided by the time
“SSt”, in order to calculate a ramp. The output power starts from 0
and is progressively increased, depending on the calculated ramp,
until the “SSt” time is reached or until the power overcomes the
power calculated by the PID controller.
To disable the Soft-Start function simply program par. “Sst” = OFF
Whenever, a measurement errors occurs during the Soft-Start
execution, the function is interrupted and the instrument gives an
output power as programmed on par. “OPE”.
If the measurement is restored, the Soft-Start is still deactivated.
If it’s desired to activate the Autotuning with Soft-Start set par.
“Auto”=4.
The Autotuning will start automatically at the end of programmed
Soft-Start cycle at the condition that the process value is lower (with
“Func” =HEAt) than [SP- |SP/2|] or higher (with “Func” =CooL) than
[SP+ |SP/2|].
4.10 – ALARM FUNCTIONING (AL1)
4.10.1 – ALARM OUTPUT CONFIGURATION
The alarm is depending on the process value (AL1) and before to set
his functioning it’s necessary to establish to which output the alarm
has to correspond to.
First of all it’s necessary to configure, in the parameters group
“
]
Out”,
the parameters relative to the outputs required as alarm
(“O1F” , “O2F”) programming the parameter relative to the desired
output as follows :
= ALno
if the alarm output has to be ON when the alarm is active,
while it’s OFF when the alarm is not active
= ALnc
if the alarm output has to be ON when the alarm is not
active, while it’s OFF when the alarm is active
= ALni
if the alarm output has to be ON when the alarm is not active,
while it is OFF when the alarm is active but with reverse led
indication (led ON= alarm OFF).
Have now access at the group
“
]
AL1”,
and program on par.
“OAL1”
, to which output the alarm signal has to be sent.
The alarm functioning is instead defined by parameters :
"AL1t "
– ALARM TYPE
"Ab1"
– ALARM CONFIGURATION
“AL1”
– ALARM THRESHOLD
“AL1L”
– LOW ALARM THRESHOLD (for band alarm) OR
MINIMUM SET OF AL1 ALARM THRESHOLD (for low or high
alarm)
“AL1H”
- HIGH ALARM THRESHOLD (for band alarm) OR
MAXIMUM SET OF AL1 ALARM THRESHOLD (for low or high
alarm)
“HAL1” -
ALARM HYSTERESIS
“AL1d”
– ALARM ACTIVATION DELAY (in sec.)
"AL1i"
– ALARM BEHAVIOUR IN THE EVENT OF
MEASUREMENT ERROR
"AL1t" – ALARM TYPE :
the alarm output can behave in six
different ways.
LoAb = ABSOLUTE LOW ALARM: The alarm is activated when the
process value goes below the alarm threshold set on parameter
"AL1”. With this mode is possible to program the minimum and the
maximum set of “AL1” by “AL1L” and “AL1H” parameters.
HiAb = ABSOLUTE HIGH ALARM: The alarm is activated when the
process value goes higher than the alarm threshold set on
parameter "AL1". With this mode is possible to program the
minimum and the maximum set of “AL1” by “AL1L” and “AL1H”
parameters.
LHAb = ABSOLUTE BAND ALARM: The alarm is activated when the
process value goes under the alarm threshold set on parameter
"AL1L" or goes higher than the alarm threshold set on parameter
"AL1H".
LodE = DEVIATION LOW ALARM: The alarm is activated when the
process value goes below the value [SP + AL1]. With this mode is
possible to program the minimum and the maximum set of “AL1” by
“AL1L” and “AL1H” parameters.
HidE = DEVIATION HIGH ALARM: The alarm is activated when the
process value goes above the value [SP + AL1]. With this mode is
possible to program the minimum and the maximum set of “AL1” by
“AL1L” and “AL1H” parameters.
LHdE = DEVIATION BAND ALARM: The alarm is activated when the
process value goes below the value [SP + AL1L] or goes above than
the value [SP + AL1H]
