4 - FUNCTIONS
4.1 - MEASURING AND VISUALIZATION
All the parameters concerning measuring are contained in the group
“
]
InP”.
Via the parameter
“SEnS”
it is possible to select the type of probes
that one wishes to use and which can be: thermistores PTC KTY81-
121 (Ptc) or NTC 103AT-2 (ntc).
Once the type of probe used has been selected, through the
parameter
“Unit”,
it is possible to select the temperature unit of
measurement (°C or°F) and, through the parameter
“dP”
, the
resolution of the desired measurement (OFF=1°; On =0,1°).
The instrument allows the measuring to be calibrated, that can be
used for re-calibrating the instrument according to application
needs, through the parameters
“OFS1”
(for the probe Pr1) and
“OFS2”
(for the probe Pr2).
If probe Pr2 (evaporator) is not used, set the parameter
“Pr 2”
= OFF.
Using the parameter
“FiL”,
it is possible to set the time constant for the
software filter for measuring the input values to be able to reduce the
sensitivity to measurement disturbances (increasing the time).
Through the paragraph
“diSP”,
it is possible to fix the normal
visualisation on the display that can be the measurement of the cell
probe (Pr 1), the measurement of the evaporator probe (Pr 2), the set
point of active regulation (SP), the current hour if the instrument has a
clock (CLo) or it can have the numerical display switched off (OFF).
Regardless of what is set in the parameter “diSP”, it is possible to
visualise all the variables in rotation by pressing the key
U
, the
display will alternately show the code that identifies the variable (
Pr
1
,
Pr 2
and, if present the clock,
CLo
) and its value.
The exit of this visualisation mode occurs automatically 15 seconds
after the last pressing on the key U.
Please remember that visualisation of the probe Pr1 can be
changed by the display block in defrosting function too, by using the
parameter “dLo” (see par. 4.6).
4.2 - OUTPUTS CONFIGURATION
The instrument outputs can be configured in the parameters group
“
]
Out”
where the relative parameters
“Out1” , “Out2” “Out3”
and
“Out4”
are found.
The outputs can be configured for the following functions
= Out
- to control the compressor or however, the temperature
control device
= dEF
- to control the defrosting device
= FAn
- to control the fans
= AuS
- to control the auxiliary device (see par. 4.11)
= ALt
- to control a silenceable alarm device through a contact that
is normally open, and then closed when the alarm sounds
= AL
- to control an alarm that cannot be silenced through a contact
that is normally open and closed when the alarm sounds.
= ALL
- to control an alarm with a memory function through a
contact that is normally open and closed when the alarm sounds.
= -ALt
- to control a silenceable alarm device through a contact that
is normally closed, and then open when the alarm sounds.
= -AL
- control an alarm that cannot be silenced through a contact
that is normally closed and open when the alarm sounds.
= -ALL
- to control an alarm with a memory function through a
contact that is normally closed and open when the alarm sounds
(see alarm memory).
= OFF
- Disabled output
4.3 - TEMPERATURE CONTROL
All the parameters concerning temperature regulation are contained
in the group
“
]
rEG”.
The regulation of the instrument is ON/OFF and acts on the output
configured as “Out” depending on the measuring of probe Pr1, of
the active Set Point
“SP”
(1 or 2), the intervention differential
“HSEt”
and the function mode
“Func”
.
Depending on the function mode programmed on the parameter
“Func” the differential is automatically considered by the regulator
with positive values for a Refrigeration control (“Func”=CooL) or with
negative values for a heating control (“Func”=HEAt).
Out
SP
off
ON
HEAt
Out
time
HSEt
SP
Temp.
HSEt
time
CooL
ON
ON
ON
ON
ON
off
off
off
Pr1
Pr1
Temp.
In the event of cell probe error (Pr1), it is possible to set the
instrument so that that the output “Out” continues to work in cycles
according to the times programmed in the parameter
“tonE”
(activation time) and
“toFE”
(deactivation time).
If an error occurs on the probe Pr1 the instrument activates the
output for the time “tonE”, then deactivates it for the time “toFE” and
so on whilst the error remains.
Programming “tonE” = OFF lthe output in probe error condition will
remain switched off.
Programming instead “tonE” to any value and “toFE” = OFF the
output in probe error condition will remain switched on.
Remember that the temperature regulation function can be
conditioned by the “Continuous Cycle”, “Compressor Protection”,
“Minimum compressor function time”, “Delay compressor start up
after defrosting” and “inhibition of compressor close to defrosting”
functions described below.
4.4 - CONTINUOUS CYCLE FUNCTION
The instrument has a continuous cycle function by which it is
possible to maintain the configured output configured as “out”
always active for the time set in parameter
“tCC”
(in the group
“
]
rEG”)
regardless of the temperature control command.
The function can be used for example, when rapid lowering of the
product temperature is required after the refrigerator loading phase.
During the continuous cycle, the defrosting is inhibited and the
temperature alarms are disabled during the entire cycle and also
later for the time set in parameter
“dALc”
(see par. 4.9).
Starting up a continuous cycle can only be done by a manual
command using the U or DOWN/AUX (“UrSb” or “Fbd” = 2) keys or
via the digital input (“diF”=3) if suitably programmed (see par. 4.10
and 4.12).
The continuous cycle in progress is shown on the display with the
indication
CC
and can be stopped by a further action on the key or
digital input (as for activation).
The continuous cycle function cannot be activated during defrosting
and with "tCC" = OFF.
4.5 - COMPRESSOR PROTECTION FUNCTION AND DELAY AT
POWER-ON
All the parameters concerning the compressor protection functions
and the delay at power on are contained in the group
“
]
PrC”.
The function “Compressor Protection” carried out by the machine
aims to avoid close start ups of the compressor controlled by the
instrument in cooling applications.
This function foresees a time control on the switching on of the
“Out” output associated with the temperature regulation request.
The protection consists of preventing the output being switched on
during the time set in the parameter
“PtC”
and counted depending
on what has been programmed in the parameter
“PSC”
, and
therefore that any activation occurs only after the “PtC” time has
finished.
If during the power on delay phase, the regulator request should
disappear, due to an inhibition caused by the compressor protection
function, the foreseen start up of the output is naturally cancelled
.
Using the parameter
"PSC", it is possible to set the type of
compressor protection and therefore from when the inhibition time
“PtC” must start.
The parameter “PSC” can be set as:
= 1
: Power on delay
Ascon Tecnologic - TLY26
- OPERATING INSTRUCTIONS - Vr. 02 - 04/14 - ISTR MTLY26ENG02 - PAG. 4
