Ascon Tecnologic - e34B - OPERATING INSTRUCTIONS - PAG. 7
5.3
Measure and display configuration
With parameter
iuP
it is possible to select the tempera-
ture engineering unit and the desired measure resolution
(
C0
= °C/1°;
C1
= °C/0.1°;
F0
= °F/1°;
F1
= °F/0.1°).
The instrument allows the measure calibration, which can
be used to recalibrate the instrument according to applica-
tion needs, the calibration is made by using parameters
iC1
(input Pr1),
iC2
(Pr2 input) and
iC3
(Pr3 input).
Parameters
iP2
/
iP3
allow to select the controller usage of
Pr2
/
Pr3
probe measure as:
EP
Evaporator probe
: used to manage the defrost and
the evaporator fans (see relative functions).
Au
Auxiliary probe
: can be used as a display-only probe,
but it is also possible to associate temperature alarms
(possible uses: product probe, anti-freeze probe, etc.);
DG
Digital Input only for
Pr3
input.
If probe input is not used, set
iP2
or
ip3
=
oF
.
Two inputs cannot be set to perform the same function.
If two inputs are set to do the same function, this is done
only by the
Pr2
input.
Using
iFt
parameter is possible to set a software filter to
decrease the input sensibility to rapid temperature changes,
increasing the sampling time, to stabilize the reading of the
measurement inputs.
In addition to this filter there are other two similar filters used
only for the
Pr1
probe measure visualization, these regard the
increasing (
tdu
parameter) and the decreasing (
tdd
) of
Pr1
measurement to avoid to display fast temperature variations.
The filter blocks the maximum decrement displayed at 0.1°
every
tdd
seconds and the maximum increase displayed
every
tdu
seconds. These filters are reset at power OFF.
Through the
idS
parameter is possible to set the variable
normally displayed:
P1
Pr1
probe measurement;
P2
Pr2
probe measurement;
P3
Pr3
probe measurement;
SP
Active Set Point;
Ec
Pr1
probe measure if the instrument is in
Normal
mode, the label
Eco
if the instrument is in
Eco
mode;
oF
If the numerical display must be switched OFF.
When one of the measures is displayed (
idS
=
P1
/
P2/P3
/
Ec
)
the
iCU
parameter allows to set an offset that is applied only
to the displayed variable (all controls are made according to
the correct temperature value, changed only by the calibra-
tion parameters).
Regardless of what is set at
idS
parameter, all the measure-
ment variables can be shown as descibed at paragraph: “
2.7
- Variables display
”.
It is also noted that the
Pr1
probe display can also be changed
by “
Defrost display lock
” function via the
ddL
parameter
(see the
Defrost function
).
5.4
Digital input configuration
The digital input function (available on
terminal 12
) is defined
using the
iFi
parameter and the action is delayed for the
time programmed with parameter
iti
. The
iFi
parameter
can be configured for the following functions:
0
Digital input not active;
1
Cell door opening with NO contact: at input closure (and
after the
iti
) the instrument displays alternately
oP
and
the variable set at
idS
parameter. With this mode of
operation of the digital input activates also the time set
with parameter
AoA
elapsed which the alarm is activated
to warn that the door has been left open. In addition, at
door opening, the instrument returns to
Normal
operation
if it was in
Eco
mode and the
Eco
mode activation was
enabled through parameter
iEt
;
2
Cell door opening with NO contact: Similar to
iFi
=
1
but with evaporator fans stop. In addition, at open door
alarm intervention (
AoA
), the fans are restarted;
3
Cell door opening with compressor and fan outputs lock
and NO contact: similar to
iFi
=
2
but with compressor
and fans lock. At open door alarm intervention (
AoA
)
both the fans and the compressor are re-activated.
4
External alarm signal with NO contact: at input closing
(and after the
iti
time) the alarm is activated and the
instrument alternately shows on the display:
AL
and the
variable set with parameter
idS
;
5
External alarm signal withall control outputs disabled and
NO contact: at input closing (and after the
iti
time) all
the control outputs are disabled, the alarm is activated
and the instrument alternately shows on the display:
AL
and the variable set with parameter
idS
;
6
Normal
/
Eco
mode selection with NO contact: at input clos-
ing (and after the
iti
time) the instrument switches to
Eco
operation mode. Opening the digital input, the instru-
ment returns in
Normal
operation mode.
7
Instrument On/Off (stand-by) selection with NO contact:
at input closing (and after the
iti
time) the instrument
is switched ON while it is placed in Stand-by mode when
the digital input is open;
8
Turbo
cycle activation command with NO contact: at in-
put closing (and after the
iti
time) the instrument starts
a Turbo cycle;
-1, -2, -3, etc.
- Features identical to the above but obtained
through a NC contact and a reversed logic operation.
5.5
Outputs and buzzer configuration
The instrument outputs can be configured by the relative
parameters
oo1
,
oo2
,
oo3
and
oo4
. The outputs can be
configured for the following functions:
ot
To control the temperature control device (e.g. Compres-
sor). To manage the cooling control device for neutral
zone control or Cooling (
rHC
=
nr
);
df
To control the defrosting device;
Fn
To control the evaporator fans;
Au
To control the auxiliary device;
At
To control a silenceable alarm device through a contact
that is NO in normal operation then closed during the
alarm;
AL
To control an alarm that cannot be silenced through
a contact that is NO in normal operation then closed
during the alarm;
An
To control an alarm with a memory function through
