EL.CO. S.R.L. – ELK22MP
-
INSTRUCTIONS FOR USE
- Ver.05 - 03/22 - PAG. 7
5 – OPERATION
5.1 - MEASUREMENT AND DISPLAY
The thermoregulator handles the following sensors that can be set
by the
“Sens”
parameter: thermocouple type (TCJ), K (TCK), S
(TCS), PTC KTY81-121 (ptc), NTC 103AT-2 (ntc), PT100 (p100), 0-
10V (0-10), 4-20mA (4-20)..
When changing this parameter, it is recommended that you turn the
power off and on again to obtain a correct measurement.
You can set the measurement unit of temperature (°C, °F) by the
“Unit”
parameter and the desired measurement resolution (0=1;
1=0,1) by the
“dP”
parameter (for Pt100, 0-10V, 4-20mA).
The device allows the calibration of the measurement, which can be
used for a new calibration of the device according to the needs of
the application, by par.
“CA”
. You can set a positive or negative
offset that is simply added to the value read by the probe before the
display and that is constant for all measurements. You can define
the temperature display range by setting the
“SSC”
and
“FSC”
parameters.
Using the
“FiL.d”
parameter, you can set the display update time..
5.2 - ON/OFF REGULATOR
This adjustment mode can be achieved by setting the
"Cont" =
On.F
parameter and can act on output 1 or output 2 or output 3
according to the measurement, of the Setpoint
"SP1"
, the operating
mode
"O1F”
,
“O2F”
,
“O3F”
, and the hysteresis
"HPOS
" and
“HNEG”
programmed.
The device performs an ON/OFF adjustment with asymmetric
hysteresis.
The regulators behave as follows: in case of reverse action or
heating (
“OxF”
=H.REG), they disable the output when the process
value reaches the [SP + HPOS] value and reactivate it when it falls
below the [SP - HNEG] value.
Vice versa, the regulators behave as follows: in case of direct action
or cooling (
“OxF”
=C.REG), they disable the output when the
process value reaches the [SP - HNEG] value and reactivate it
when it goes over the [SP + POS] value.
5.3 - NEUTRAL ZONE ON/OFF ADJUSTMENT
Neutral Zone operation is used to control systems that have an
element that causes a positive increase (i.e. heating, humidifying,
etc.) and an element that causes a negative increase (i.e. cooling,
dehumidifying, etc.).
This operation can be carried out when there are 2 outputs and it’s
obtained by programming the parameter
“Cont” = ON.FN
, the
parameter
“OxF” = H.REG
, the parameter
“OyF” =
C.REG
.
The adjustment operation operates on outputs depending on the
measurement of the setpoint
"SP1"
and hysteresis
"HPOS
" and
“HNEG”
programmed.
The regulator behaves as follows: it turns off the outputs when the
process value reaches the
SP1
setpoint and activates the
OUT1
output when the process value is less than [
SP1-HNEG
],or turns on
the OUT2 output when the process value is greater than
[
SP1+HPOS
].
Consequently, the element causing the positive increase will be
connected to the
OUT1
output while the negative increase element
will be connected to
OUT2
output.
5.4 - PID REGULATOR
The PID single action adjustment mode can be implemented by
setting the parameter
"Cont" = Pid
and acts on OUT1 or OUT2 or
OUT3 output as a function of the
“SP1”
setpoint.
To obtain a good stability of the variable in fast processes, the
“tr1”
cycle time must have a low value with a very frequent intervention
of the adjustment output.
In this case, it is recommended to use a static relay (SSR) for the
actuator control.
The single-action PID adjustment algorithm provides the setting of
the following parameters:
"Pb"
- Proportional Band
"tI"
- Integral Time
"td"
- Derivative time
"tr1"
- Output cycle time
5.5 - AUTOTUNING FUNCTION
The
AUTOTUNING
function calculates the PID parameters through
an OSCILLATORY tuning cycle, after which the parameters are
stored by the device and, during the adjustment, they remain
constant.
Autotuning
function
automatically
calculates
the
following
parameters:
"Pb"
- Proportional Band
"Int"
- Integral Time
"dEr"
- Derivative time
To enable the AUTOTUNING function, proceed as follows:
1) Set the desired
“SP1”
setpoint.
2) Set the
"Cont"
=Pid setpoint.
3) Set the
"O1F"
parameter depending on the process to be
controlled through OUT1 output.
4) Set the
"Auto"
parameter as:
= 1 - if you want autotuning to start automatically every time you
turn on the device.
= 2 - if you want autotuning to start automatically at the next power
up of the device and, once tuning is completed, the par.
“Auto”
=OFF.
= 3 – manual start-up by hold down the key
for 5 seconds
5) Quit programming parameters.
6) Connect the device to the controlled system.
7) Activate autotuning by turning the unit off and on again. At this
point, the Autotuning function is activated and is reported through
the "Auto" display on the green display.
