lower than the one set in the parameter
“F.LF”
(temperature too
cold).
The relative differential that can be set in parameter
“F.dF”
is also
associated with these parameters
.
F.dF
F.dF
tim e
F n
off
O N
F .LF
EP
Tem p.
F .FL
off
off
O N
Remember that the fans functioning can be conditioned by the
“Door open” function by the digital input.
Notes: It is necessary to pay attention to the correct use of this fans
temperature control functions because in the typical application of
refrigeration the stop of the fans evaporator stops thermal
exchange.
4.10 - ALARM FUNCTIONS
The alarm conditions of the instrument are:
- Probe errors :
“E1”, “-E1”, “E2”, “-E2”
- temperature alarms:
“Hi”
and
“Lo”
- External alarm:
“AL”
- Open door alarm:
“oP”
The alarm functions of the instrument work on the ALARM led, on
internal buzzer (if present and programmed by par. “o.bu”) and on
output desired, if configured by the parameters “o1”, “o2”,
depending on what is set on the said parameters.
Any active alarm is shown on the instrument display with the
lighting up of the ALARM led, the silenced or memorized alarm
status is shown by the ALARM led flashing .
The buzzer (if “o.bu” = 1 or 3) is activated in alarm and can be
disabled (alarm silencing) manually by pressing any key of the
instrument.
The possible selections of output parameters for the alarm
signalling function are:
= At
- when one wants the output to be activated in alarm and can
be disabled (alarm silencing) manually by pressing any key of the
instrument (typical application for sound signal).
= AL
- when one wants the output to be activated in alarm status
but cannot be disabled manually and are therefore only disabled
when the alarm status ceases (typical application for a light signal).
= An
- when one wants the output to be activated in alarm status
and that they remain activated even when the alarm has ceased
(see par.4.10.4) Disablement (recognition of memorised alarm) can
only be carried out manually by pressing any key when the alarm
has ended (typical application for light signal).
= -At
- when one wants the function described as At but with an
inverse function (output activated in normal condition and disabled
in alarm status).
= -AL
- when one wants the function described as AL but with
inverse logic (output activated in normal conditions and disabled in
alarm status).
= -An
- when one wants the function described as An but with
inverse working logic (output activated in normal conditions and
disabled in alarm status).
The instrument offers the possibility of arranging the alarm memory
function via the parameter
“A.tA”.
If "A.tA" = oF, the instrument cancels the alarm signal when the
alarm status ends, if instead it is programmed as "on" , the
instrument maintains the alarm signal when the alarm status ends.
To cancel the alarm memory signal, press any key.
It must be remembered that if an output function is desired with an
alarm memory (=An or =-An) it is necessary to set the parameter
“A.tA” = on.
4.10.1 - TEMPERATURE ALARMS
The temperature alarms work according to the programmed probe
measurement, the type of alarm set in the parameter
“A.Ay”
the
alarm thresholds set in parameters
“A.HA”
(maximum alarm) and
“A.LA”
(minimum alarm) and the relative differential
“A.Ad”.
Through the parameter “A.Ay” it is possible to set if the alarm
thresholds “A.HA” and “A.LA” must be considered as absolute or
relative to the Set Point , if the reference temperature must be Pr1
or “Au” probe measurement and if the display must be show the
messages Hi (maximum alarm)/ Lo (minimum alarm) to the
intervention of the alarms or no.
The possible selections of the parameter “A.Ay” are:
= 1 : Pr1 Absolute Alarms with labels (Hi - Lo)
= 2 : Pr1 Relative Alarms with labels (Hi - Lo)
= 3 : “Au” probe Absolute Alarms with labels (Hi - Lo)
= 4 : “Au” probe Relative Alarms with labels (Hi - Lo)
= 5 : Pr1 Absolute Alarms without labels
= 6 : Pr1 Relative Alarms without labels
= 7 : “Au” probe Absolute Alarms without labels
= 8 : “Au” probe Relative Alarms without labels
Using some parameters it is also possible to delay the
enablement and the intervention of these alarms.
These parameters are:
“A.PA”
- is the temperature alarm exclusion time on switching on
the instrument if the instrument is in alarm status when it is
switched on.
If the instrument at power on is not in temperature alarm conditions
the time "A.PA is not considered.
“A.dA”
- is the temperature alarm exclusion time at the end of
defrosting (and , if programmed, at the end of draining) and at the
end of a continuous cycle.
“A.At”
- is the temperature alarm delay activation time
The temperature alarm is enabled at the end of exclusion time and
is enabled after the “A.At” time when the temperature measured by
the probe exceeds or goes below the respective maximum and
minimum alarm thresholds.
The alarm thresholds will be the same as those set on the
parameters “A.HA” and “A.LA” if the alarms are absolute (“A.Ay”=1,
3, 5, 7).
A .A d
A .A d
tim e
A L
o ff
O N
A .L A
H i
A .H A
T e m p .
L o
o ff
o ff
O N
or will be the values [”SP”+”A.HA”] and [”SP”+”A.LA”] if the alarms
are relative (“A.Ay”=2, 4, 6, 8).
tim e
A .A d
A .A d
A L
o ff
O N
H i
A .LA
S P
A .H A
T em p.
L o
off
o ff
O N
The maximum and minimum temperature alarms can be disabled
by setting the relative parameters "A.HA" and "A.LA" = oF.
4.10.2 - EXTERNAL ALARM
The instrument can signal an external alarm by activating the digital
input with the function programmed as “i.Fi” = 4 or 9.
At the same time as the signalling of the configured alarm output,
the instrument visualising
AL
and the variable set in parameter
“i.dS” alternately on the display.
ASCON TECNOLOGIC - Z31Y
- OPERATING INSTRUCTIONS - Vr. 02 - 04/12 - ISTR-MZ31YENG02 - PAG. 8
