The intervention differential for the “ot” output will be whichever is
active (“r.d” or “r.Ed” or “r.Hd”) and the regulator will automatically
assume it has positive values (in the case of Cooling) whereas for
the output "HE" it will be "r.Hd" with values assumed to be negative
(in the case of Heating).
In this mode, activating the "turbo" cycle causes the instrument to
operate with neutral-zone regulation with set point SPH.
= C3 (Cooling with three automatic modes)
The instrument still cools but this selection activates automatic
switching between the three modes, Normal, Eco and Turbo, as
already described in the section on operating modes.
All time protections described in the next paragraph (P.P1, P.P2,
P.P3) always act only on the output configured as “ot”.
In the event of probe error, it is possible to set the instrument so
that that the output “ot”continues to work in cycles according to the
times programmed in the parameter “r.t1” (activation time) and
“r.t2” (deactivation time).
If an error occurs on the probe the instrument activates the output
for the time “r.t1”, then deactivates it for the time “r.t2” and so on
whilst the error remains.
Programming “r.t1” = oF the output in probe error condition will
remain switched off.
Programming instead “r.t1” to any value and “r.t2” = oF the output
in probe error condition will remain switched on.
Remember that the temperature regulation function can be
conditioned by the “Compressor Protection and output delay at
power-on”, “Defrost”, “Door open” and “external alarm with outputs
disable” functions.
4.7 - COMPRESSOR PROTECTION FUNCTION AND DELAY AT
POWER-ON
All the parameters concerning compressor protection functions are
contained in the group “
]
Pr”.
The function “Compressor Protection” aims to avoid close start ups
of the compressor controlled by the instrument in cooling
applications.
This function foresees 3 time controls on the switching on of the
output configured as “ot” associated with the temperature
regulation request.
The protection consists of preventing the output being switched on
during the times set in the parameters “P.P1”, “P.P2” and “P.P3”
and therefore that any activation occurs only after all the times has
finished.
First control (par. “P.P1” ) foresees a delay to the output activation
(switching-on delay).
Temp.
off
ON
SP
time
r.d
off off off
ON ON
Pr1
Out
(ot)
Second control (par. “P.P2” ) 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).
ON
off
P.P2
P.P2 P.P2
SP
Temp.
time
r.d
ON ON
off off
Pr1
Out
(ot)
Third control (par. “P.P3” ) foresees an inhibition to the activation
of the output "Out" by a time delay that starts when the output was
turning on last time (delay between switching-on).
P.P3
off
SP
ON
Temp.
P.P3 P.P3
time
r.d
off off
ON ON
Pr1
(ot)
Out
During the output inhibition the led OUT (Cool o Heat) blinking.
It is also possible to prevent activation of the output after the
instrument is turned on, for the time set in the parameter “P.od”.
During the power on delay phase, the display shows the indication
od, alternating with the normal visualisation.
All the functions are disabled by relative parameters = oF.
4.8 - DEFROST CONTROL
The defrosting control acts on the outputs configured as “ot” and
“dF”.
The type of defrosting that the instrument must carry out is set by
the parameter “d.dt” that can be programmed:
= EL - WITH ELECTRICAL HEATING (or BY STOPPING
COMPRESSOR): during defrosting, the output “ot” is deactivated
while the output “dF” is enabled.
The defrost will be by Stopping compressor if not using the “dF”
output
= in - WITH HOT GAS or INVERSION OF CYCLE:
during defrosting the outputs “ot” and “dF” are enabled
= no - WITHOUT COMPRESSOR OUTPUT CONDITIONING:
during defrosting, the output “ot” continuous to operate in order to
temperature controller while the output “dF” is enabled.
= Et - WITH ELECTRICAL HEATING AND DEFROSTING
TEMPERATURE CONTROL: during defrosting, the output “ot” is
deactivated while the output “dF” operate as evaporator
temperature control. In this mode the defrost lenght is by time-out
(time "d.dE"). During the defrost "dF" output it behaves as an
heating mode temperature control with Set = "d.tE" and fixed
differential at 1°C and operate in order to evaporator probe (EP).
4.8.1 - STARTING AUTOMATIC DEFROSTS
The automatic control of defrost occours:
- By interval times (regular or dynamic)
- By Evaporator temperature
- By continuous compressor running time
In order to avoid pointless defrosting the parameter “d.tS” in
“d.dC” = rt, ct, cS mode is foreseen that sets the enablement
temperature for defrosting
If the temperature measured by the probe is higher than set in the
parameter “d.tS” the defrosting is inhibited.
- Defrost by regular interval time
Counting mode interval and automatic defrost starts is set through
the parameter "d.dC" that can be programmed:
= rt - intervals with counts the total function time (instrument on)
This mode results that currently used in the refrigerators systems.
= ct - intervals with counts only the compressor function time
(output “ot” switched on)
Mode typically used in the positive temperature refrigerators
system with defrost by stopping compressor.
= cS - the instrument carries out a defrosting cycle at each
compressor stop (i.e. at each deactivation of the output “ot”) or
however at defrost interval end with counts the total function time
(instrument on).
If "d.di" = oF the defrost happens only to the compressor stop.
This mode is used only on particular refrigerator system in which is
desired to always have the evaporator to the maximum efficiency
conditions every compressor cycle.
The automatic defrost function is activate when at the parameter
“d.di” is set the defrost interval time.
ASCON TECNOLOGIC - Y33 - OPERATING INSTRUCTIONS - Vr. 01 - 04/16 - ISTR-MY33-ENG01 - PAG. 7
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