Parameters Programming Levels; Functions; Measuring And Visualization - Eliwell EWTQ 905 Manual

Tenere premuto
per 2 sec.
Hold for
2 sec.
GRUPPI PARAMETRI
PARAMETER GROUPS
"OPEr"
or/oppure
gruppo precedente
"ConF"
men˘
Previous
Group
premere per 2sec
O
R
Hold for
Next
2 sec.
Group
EXIT /
USCITA
gruppo seguente
Once the desired value has been programmed,
push key set once more: the new value will be
memorised and the display will show only the
code of the selected parameter.
By using the "UP" or "DOWN" keys, it is then
possible to select a new parameter (if present)
and modify it as described above.
To select another group of parameters, keep the
"UP" or "DOWN" key setressed for approx. 2
sec., afterwards the display will return to visu-
alise the code of the group of parameters.
Release the key and by using the "UP" and
"DOWN" keys, it will be possible to select a new
group (if present).
To exit the programming mode, no key should
be pressed for approx. 20 seconds, or keep the
"UP" or "DOWN" pressed until exit from the
programming mode is obtained.
To enter the menu "ConF" a PASSWORD is
required.
At this request, enter, using keys "UP" and
"DOWN", the number reported on the last page
of this manual and push key set.
If an incorrect password is entered, the instru-
ment returns to the previous control state.
If the password is correct, the display will visu-
alise the code identifying the first group of
parameters (" ]SP ") and with keys "UP" and
"DOWN" it will be possible to select the desired
group of parameters
The programming and exit modes for the
"ConF" menu are the same as those described
for menu "OPEr".

PARAMETERS PROGRAMMING LEVELS

The menu "OPEr" normally contains the para-
meters used to program the Set Point; however
it is possible to make all desired parameters
appear or disappear on this level, by following
this procedure:
Enter the menu "ConF" and select the parame-
ter to be made programmable or not program-
mable in the menu "OPEr".
Once the parameter has been selected, if the
LED SET is switched off, this means that the
parameter is programmable only in the menu
"ConF", if instead the LED is on, this means that
the parameter is also programmable in the
menu "OPEr".
EWTQ 905
" OPEr "
menu
SET/imposta
PASSWORD
PARAMETRI IMPOSTA PARAMETRO
PARAMETERS SET PARAMETER
parametro
precedente
Previous
Parameter
Hold for
2 sec.
O
R
Hold
premere
Next
Longer
+ a lungo
Parameter
parametro
seguente

FUNCTIONS

MEASURING AND VISUALIZATION

All the parameters referring measurements are
contained in the group "]InP".
Depending on the model required the input
accept:
• C: Thermocouples temperature probes (J,K),
mV signals (0..50/60 mV, 12..60 mV),
Thermoresistances PT100.
• E : Thermocouples temperature probes (J,K),
mV signals (0..50/60 mV, 12..60 mV),
Thermistors PTC and NTC.
• I : normalized analogue signals 0/4..20 mA
• V : normalized analogue signals
0..1 V, 0/1..5 V, 0/2..10 V
Depending on the model, using par. "SEnS", it's
possible to select the type of input probe,
which can be :
• for thermocouples J (J), K (CrAL)
• for thermoresistances Pt100 IEC (Pt1)
• for thermistors PTC KTY81-121 (Ptc) or NTC
103AT-2 (ntc)
• for normalised signals in current 0..20 mA
(0.20) or 4..20 mA (4.20)
• for normalised signals in tension 0..1 V (0.1),
0..5 V (0.5), 1..5 V (1.5), 0..10 V (0.10) or 2..10 V
(2.10).
- for normalised signals in tension 0..50 mV
(0.50), 0..60 mV (0.60), 12..60 mV (12.60).
We recommend to switch on and off the instru-
ment when these parameters are modified, in
order to obtain a correct measuring.
For the instruments with input for temperature
probes (tc, rtd) it's possible to select, through
par. "Unit", the unit of measurement (°C, °F)
and, through par. "dP" (Pt100, PTC and NTC
only) the desired resolution (0=1°; 1=0,1°).
Instead, with regards to the instruments with
normalised analogue input signals, it is first nec-
essary to program the desired resolution on par.
"dP" (0=1; 1=0,1; 2=0,01; 3=0,001) and then,
on par. "SSC", the value that the instrument
must visualise at the beginning of the scale (0/4
mA, 0/12 mV, 0/1 V o 0/2 V) and, on par. "FSC",
the value that the instrument must visualise at
the end of the scale (20 mA, 50 mV, 60 mV, 5 V
or 10 V).
The instrument allows for measuring calibration,
which may be used to recalibrate the instru-
ment according to application needs, by using
par. "OFSt" and "rot".
Programming par. "rot"=1,000, in par. "OFSt" it
is possible to set a positive or negative offset
that is simply added to the value read by the
probe before visualisation, which remains con-
stant for all the measurements.
If instead, it is desired that the offset set should
not be constant for all the measurements, it is
possible to operate the calibration on any two
points.
In this case, in order to decide which values to
program on par. "OFSt" and "rot", the following
" ConF "
formulae must be applied :
menu
"rot" = (D2-D1) / (M2-M1)
"OFSt" = D2 - ("rot" x M2)
where:
M1 =measured value 1
D1 = visualisation value when the instrument
measures M1
incrementa
M2 =measured value 2
valore
D2 = visualisation value when the instrument
Increase
Value measures M2
It then follows that the instrument will visualise
: DV = MV x "rot" + "OFSt"
where: DV = visualised value MV= measured
Decrease
value
Value
decrementa
valore Example 1: It is desired that the instrument visu-
alises the value effectively measured at 20° but
that, at 200°, it visualises a value lower than 10°
(190°).
Therefore : M1=20 ; D1=20 ; M2=200 ;
D2=190
"rot" = (190 - 20) / (200 - 20) = 0,944
"OFSt" = 190 - (0,944 x 200) = 1,2
Example 2: It is desired that the instrument visu-
alises 10° whilst the value actually measured is
0°, but, at 500° it visualises a 50° higher value
(550°).
Therefore : M1=0 ; D1=10 ; M2=500 ;
D2=550
"rot" = (550 - 10) / (500 - 0) = 1,08
"OFSt" = 550 - (1,08 x 500) = 10
By using par. "FiL" it is possible to program time
constant of the software filter for the input
value measured, in order to reduce noise sensi-
tivity (increasing the time of reading).
In case of measurement error, the instrument
supplies the power as programmed on par.
"OPE".
This power will be calculated according to cycle
time programmed for the PID controller, while
for the ON/OFF controllers the cycle time is
automatically considered to be equal to 20 sec.
(e.g. In the event of probe error with ON/OFF
control and "OPE"=50, the control output will
be activated for 10 sec., then it will be deacti-
vated for 10 sec. and so on until the measure-
ment error remains.).
Again in the group "]PAn" the par. "AdE" is pre-
sent that defines the 3 led shift index function-
ing.
The lighting up of the green led = indicates that
the process value is within the range [SP+AdE
... SP-AdE], the lighting up of the led – indicates
that the process value is lower than [SP-AdE]
and the lighting up of the led + indicates that
the process value is higher than [SP+AdE].
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