Ascon Tecnologic - e31- - OPERATING INSTRUCTIONS - PAG. 7
ment so that that the output continues to work in cycles
according to the times programmed with parameter
rt1
(activation time) and
rt2
(deactivation time).
If an error occurs on the probe the instrument activates the
output for the time
rt1
, then deactivates it for the time
rt2
and so on whilst the error remains.
Programming
rt1
=
oF
the output in probe error condition
remains switched off.
Programming instead
rt1
to any value and
rt2
=
oF
the
output in probe error condition remains switched ON.
Remember that the temperature regulation function can be
conditioned by the
Compressor Protections
,
Delay at power
ON
and
Defrost functions
.
5.6
Compressor protection function and
power-on delay
The “
Compressor Protection
” function aims to avoid repeated
compressor start-ups controlled by the instrument in cooling
applications or otherwise can be used to add a timed control
on the actuator control output.
This function foresees 3 time controls on the switching ON of
the output associated with the temperature control request.
The protection consists of preventing the output being
switched ON during the times set with parameters
PP1
,
pP2
and
PP3
and therefore that any activation occurs only after
all times are elapsed.
1.
First control (parameter
PP1
) foresees a delay to output
activation (switching-ON delay).
SP
time
off
off
off
off
ON
rd
PP1
PP1
PP1
PP1
OUT (ot)
Temp.
Pr1
ON
ON
2.
Second control (parameter
PP2
) foresees an inhibition to
the activation of the output by a time delay that starts when
the output is turning OFF (delay after switching-OFF).
SP
off
off
off
ON
rd
PP2
PP2
PP2
PP2
Temp.
Pr1
time
OUT (ot)
ON
ON
3.
Third control (parameter
PP3
) foresees an inhibition to
the activation of the output by a time delay that starts
when the output was turned ON last time (delay between
two switching-ON).
SP
off
off
off
ON
rd
PP3
PP3
PP3
time
OUT (ot)
PP3
Temp.
Pr1
ON
ON
During the output inhibition the LED
OUT
(Cool
or Heat
)
blinks. It is also possible to prevent activation of the output
after the instrument is turned ON, for the time set in the
parameter
Pod
.
During the power ON delay phase, the display shows the
indication
od
, alternated with the normal visualization.
All these functions are disabled if the relative parameters are
set to
OFF
(
oF
).
5.7
Defrost control
The automatic defrost control is made with the
stopping
compressor
method; it occurs by interval times or after a
certain time of continuous compressor functionning.
The automatic defrost function is activated when at parameter
ddi
is set the defrost interval time between 2 defrost cycles.
The first defrost after power on can be set by parameter
dSd
.
This allows to perform the first defrost to a different interval
from
ddi
time.
When the instrument must perform a defrost cycle at all power
ON, set parameter
dSd
=
oF
.
If all defrost cycles must be performed after the same inter-
val time, program
dSd
=
ddi
.
Automatic defrost function is totally disabled when
ddi
=
oF
(including the first, regardless the time set at
dSd
parameter).
The instrument provides to switch OFF the output for the
ddE
period of time every time expires the
ddi
time (or
dSd
in case of first defrost after power ON).
Moreover, the instrument starts a defrost cycle when the
compressor is activated continuously for the time
dcd
.
This function is used as the continuous operation of the com-
pressor for a long period is normally a symptom of a low heat
exchange typically caused by the frost on the evaporator.
By setting
dcd
=
oF
the function is disabled.
5.7.1
Manual defrost
To start a manual defrosting cycle, press the key
/ when
it is not in programming mode and keep it pressed for about
5 s after which, if the conditions are correct, the LED will
light up and the instrument performs out a defrosting cycle.
To stop a defrosting cycle, press the key
/ during the
defrost and keep it pressed for about 5 seconds.
5.7.2
Display lock during Defrost
Through parameters
ddL
and
AdA
it is possible to define the
display behaviour during defrost. The
ddl
parameter can as-
sume the following values.
on
The
ddL
parameter locks the display at the last tem-
perature reading during all the defrost cycle until, at
the end of defrost, the temperature has not reached
the lock value or the value [
SP
+
rd
] or is elapsed the
time set at parameter
AdA
Lb
Shows the label
dEF
during the defrost cycle and
after the defrost until, at the end of defrost, the tem-
perature has not reached the lock value or the value
[
SP
+
rd
] or is elapsed the time set on parameter
AdA
oF
The display continues showing the temperature meas-
ured by the
Pr1
probe during the defrost cycle.
