Ascon Tecnologic - e34B - OPERATING INSTRUCTIONS - PAG. 12
5.10 Alarm functions
The alarm conditions of the instrument are:
–
Probe errors
E1
,
-E1
,
E2
,
-E2
and
E3
,
-E3
;
–
Temperature alarms
Hi
and
Lo
;
–
External alarm
AL
;
–
Door open
oP
;
–
Power supply alarms
HU
,
LU
.
The alarm functions acts on LED , on the internal buzzer, if
present and configured by the
obu
parameter and on the de-
sired output if configured by parameters
oo1
,
oo2
,
oo3
or
oo4
.
Any active alarm condition is signaled lighting up the LED ,
while the acknowledged alarm status is shown by flashing the
LED .
The buzzer (if present) can be configured to point out the alarms
by programming parameter
obu
=
1
or
3
and always acts
to signal an acknowlegeable alarm. This means that, when
activated, it can be switched
OFF
by briefly pressing any key.
Also outputs can operate to signal alarms as specified by
the output configuration parameters settings that follow. The
possible selections of output parameters for the alarm sig-
nalling function are:
At
When the output is to be activated in alarm condition
and can be deactivated manually by pressing any key of
the instrument (typical application for an acoustic signal);
AL
When the output is to be activated in alarm condition
but cannot be deactivated manually; it is then deac-
tivated only when the alarm status ceases (typical
application for a light signal);
An
When the output is to be activated in alarm condition
and that remains active even when the alarm sta-
tus has ceased (stored alarm). The disabling action
(recognition of a stored alarm) can only be carried out
manually by pressing any key only when the alarm
status has been removed.
-t
Functions as the function described with
At
but with
inverse working logic (the output activated in normal
condition and disabled in alarm status).
-L
This alarm function is similar to
AL
but with inverse
working logic (output active in normal conditions and
disabled in alarm status).
-
n
This alarm function is similar to
An
but with inverse
working logic (output active in normal conditions and
disabled in alarm status).
The instrument offers the possibility to have the alarm
memory function activated via the parameter
AtA
:
oF
The instrument cancels the alarm signal when the
alarm status ends;
on
The instrument maintains the flashing of LED also
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 (
oo1
/
oo2
/
oo3
/
oo4
=
An
/
-n
) it is
necessary to set the parameter
AtA
=
on
.
5.10.1 Temperature alarms
The temperature alarm works according to
Pr1
or
AU
probes
measurement, the type of alarm set in the parameter
AAy
the
alarm thresholds set in parameters
AHA
(maximum alarm)
and
ALA
(minimum alarm) and the relative differential
AAd
.
Through parameter
AAy
it is possible to set the alarm thresh-
olds
AHA
and
ALA
as absolute or relative to the active Set
Point, must be related to
Pr1
or
Au
probes and if the message
Hi
(High alarm) and
Lo
(Low Alarm) are to be displayed (or
not) at alarm intervention.
Depending on the desired alarm operating mode, parameter
AAy
can be set as:
1
Absolute alarms referred to probe
Pr1
, displays
Hi
/
Lo
;
2
Relative Alarms referred to probe
Pr1
, displays
Hi
/
Lo
;
3
Absolute alarms referred to probe
Au
, displays
Hi
/
Lo
;
4
Relative Alarms referred to probe
Au
, displays
Hi
/
Lo
;
5
Absolute alarm referred to probe
Pr1
, displays no labels;
6
Relative alarm referred to probe
Pr1
, displays no labels;
7
Absolute alarm referred to probe
Au
, displays no labels;
8
Relative alarm referred to probe
Au
, displays no labels.
Using some parameters it is also possible to delay the ena-
bling and the intervention of these alarms.
These parameters are:
APA
Temperature alarm exclusion time on switching ON the
instrument if the instrument is in alarm status when it
is switched ON. If the instrument is not in alarm status
when it is switched on the time
APA
it is not considered.
AdA
Temperature alarm exclusion time at the end of de-
frost cycle (and, if programmed, after the draining) or
after a continuous cycle.
AAt
Temperature alarms delay activation time. Tempera-
ture alarms are enabled at the end of the exclusion
times and are activated after the
AAt
time when the
temperature measured by the probe exceeds or goes
below the respective maximum and minimum alarm
thresholds. The alarm thresholds are those set at
parameters
AHA
and
ALA
when the alarms are set as
absolute (
AAy
=
1
,
3
,
5
,
7
).
Temp.
AHA
AAd
time
AL
ALA
AAd
off
off
off
ON
ON
Hi
Lo
Pr1
or they assume the values [
SP
+
AHA
] and [
SP
+
ALA
]
if the alarms are relative (
AAy
=
2
,
4
,
6
,
8
).
AHA
SP
ALA
off
off
off
ON
ON
Hi
Lo
AL
AAd
AAd
Temp.
time
Pr1
The maximum and minimum temperature alarms can be disa-
bled by setting the related parameters
AHA
and
ALA
=
oF
.
The temperature alarms are signalled lighting up the alarm
LED ( ) and, if configured, also with the buzzer.
