Ascon Tecnologic - e33 - OPERATING INSTRUCTIONS - PAG. 8
5.6
Temperature control
The instrument controls the temperature with an ON/OFF
action and operates on the outputs configured as ot and
HE depending on the PR1 probe measuring, the acive Set
Point/s
SP
/
SPE
/
SPH
, the Hysteresis
rd
/
rEd
/
rHd
and the
function mode set with
rHC
parameter. Using the
rHC
pa-
rameter can be obtained the functions that follow.
C
Cooling;
H
Heating.
SP
Temp.
rd
time
off
off
SP
rd
time
ON
rHC
=
C
rHC
=
H
off
off
ON
ON
ON
ON
ON
output
ot
output
ot
Pr1
Temp.
Pr1
Depending on the function mode programmed with parameter
rHC
the differential is automatically considered by the control-
ler with positive values for a
Refrigeration
control (
rHC
=
C
)
or negative values for a
Heating
control (
rHC
=
H
).
nr
Neutral Zone
SP
off
off
ON
Temp.
time
rd
rd
off
off
rHC
= nr
ON
ON
HE
ot
Outputs
Pr1
When
rHC
=
nr
, the output configured as
ot
operates with a
cooling action (like
rHC
=
C
) while the output configured as
HE
operates with a heating action both with the active Set Point
(
SP
/
SPE
/
SPH
). The intervention differential (
rd
/
rEd
/
rHd
) is au-
tomatically assumed by the controller to have positive values for
the cooling action and negative values for the heating action.
HC
Cooling and Heating with independent Set Points
SP
SPH
off
off
off
Temp.
time
rd
rd
off
off
off
RHC
= HC
ON
ON
ON
ON
ON
HE
ot
Pr1
Outputs
As in the previous case, when
rHC
=
HC
the output config-
ured as
ot
operates with cooling action (like
rHC
=
C
) while
the output configured as
HE
operates with heating action.
In this case, however, the Set Point for the
ot
output is the
active one between
SP
,
SPE
or
SPH
, while for the
HE
output
the Set Point is
SPH
. The intervention differential for the
ot
output is the active between
rd
,
rEd
or
rHd
and is automati-
cally assumed by the controller to have positive values for the
cooling action while for the output
HE
the differential is
RHd
considered with negative values as for the Heating actions.
In this mode, the activation of the Turbo cycle causes the
instrument to operate with Neutral Zone and
SPH
set point.
The time protections described in the next paragraph (
PP1
/
PP2
/
PP3
) always work on the output configured as
ot
and
have no effect on the
HE
output.
In the event of a probe error, it is possible to set the instru-
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 a
Pr1
probe error occurs, the instrument can continue to
activate the
ot
output for
rt1
time, then disables it for
rt2
time and so on until the error persists.
By programming
rt1
=
oF
the output, in probe error condi-
tion, will always be OFF. On the contrary, programming
rt1
to any value and
rt2
=
oF
the output, in probe error condi-
tions, will always be on.
Remember that the operation of the temperature controller
can be conditioned by the following functions:
Compressor
protection function and power-on delay
,
Defrost
,
Open door
and
External alarm with output block
from digital input.
5.7
Compressor protection 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 configured as
ot
. The protection consists of pre-
venting the
ot
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
ot
out-
put activation (switching-ON delay).
SP
Temp.
time
off
off
off
off
ON
ON
r.d
P.P1
P.P1
ot
ON
Pr1
Output
P.P1
P.P1
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).
off
off
off
ON
SP
time
rd
PP2
ON
ON
Temp.
ot
Pr1
Output
PP2
PP2
PP2
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).
off
off
off
ON
SP
time
rd
PP3
PP3
PP3
PP3
ON
ON
Temp.
ot
Pr1
Output
During the output inhibition the LED
OUT
(Cool
or Heat
)
blinks. It is also possible to prevent activation of all the outputs
after the instrument is turned ON, for the time set in the param-
eter
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
).
