Ascon Tecnologic - Y39W Line - Operating Instructions - Pag. 10
defrosts the output behaves as established by param-
eter
d.dt
(if =
EL
the output is deactivated; if =
Fn
/
no
the
output is activated).
The status of the fan output is signalled by LED. If no
output is configured for
Fn
operation, the LED is always
off. The fan output can be inhibited via the digital input con-
figured as a door sensor (
i.Fi
=
5
).
5.10 Alarm Functions
The alarm conditions of the instrument are:
–
Probe errors:
E1
,
-E1
,
E2
,
-E2
,
E3
,
-E3
;
–
Temperature alarms:
Hi1
,
Lo1
,
Hi2
and
Lo2
;
–
External alarm:
AL
;
–
Open door alarm:
oP
.
The instrument alarm functions act on the alarm LED
, on
internal buzzer (if present and programmed by parameter
o.bu
) and on the desired output, if configured with param-
eters
o.o1
,
o.o2
or
o.o3
according to the parameters set.
All alarm conditions are pointed out lighting up the
LED, while
the silenced or stored alarms are shown with
LED flashing.
The buzzer when present, can be configured to point out the
alarms with parameter
o.bu
=
1
or
3
, is activated in alarm
condition and can be manually disabled pressing any instru-
ment key (alarm silencing).
The possible selections of output parameters for the alarm
signalling function are:
At
The output is activated in alarm condition and can be
manually deactivated by pressing any key of the instru-
ment (typical application for an acoustic signal);
AL
The output is activated in alarm condition but cannot be
manually disabled; the alarm status ends when the alarm
condition ceases (typical application for a light signal);
-t
Function similar to
At
but with inverse logic function
(output active in normal conditions, disabled in alarm).
-L
Function similar to
AL
but with inverse logic function
(output active in normal conditions, disabled in alarm).
5.10.1 Temperature Alarms
The instrument has two temperature alarms, each with a
maximum and minimum threshold, fully configurable.
The temperature alarms work according to
pr1
,
pr2
or
Aux
probes measurements, the type of alarm set at parameters
A.y1
and
A.y2
the alarm thresholds at parameters
A.H1
and
A.H2
(maximum alarms),
AlH1
and
A.l2
(minimum alarms)
and the relative differentials
A.A1
and
A.A2
.
Through parameters
A.y1
/
A.y2
it is possible to set if alarm
thresholds
A.H1
/
A.H2
/
A.L1
/
A.l2
are to be considered as
Absolute or Relative to which Set Point and if the reference
temperatures must be related the pobe set as
Pr1
or to the
probe set as
r2
or
Au
probe.
The possible selections of parameters
A.y2
and
A.y2
are:
1
Absolute Alarms referred to
Pr1
probe;
2
Alarms Relative to
SP1
referred to
pr1
probe;
3
Absolute Alarms referred to
r2
probe;
4
Alarms Relative to
SP2
referred to
r2
probe;
5
Absolute Alarms referred to
Au
probe.
Using some parameters it is also possible to delay the ena-
bling and the intervention of these alarms.
These parameters are:
A.PA
Temperature alarms intervention delay
at instrument
power ON
when the instrument is in alarm status at
power ON. If the instrument is not in alarm status at
power ON,
A.PA
is not considered.
A.dA
Temperature alarms exclusion time at the end of de-
frost cycle (and, if programmed, after the draining) or
after a continuous cycle.
A.t
o
Temperature alarms 1 and 2 delay activation time.
Temperature alarms are enabled at the end of the
exclusion times and are activated after
A.t1
,
A.t2
times when the temperature measured by the probe(s)
exceeds or goes below the respective maximum and
minimum alarm thresholds. The alarm thresholds are
those set at parameters
A.H1
/
A.h2
/
A.L1
/
A.l2
when the
alarms are set as absolute (
A.y1
and
A.y2
=
1
,
3
,
5
);
AL1
A.L1
A.H1
A.A1
A.A1
time
off
off
off
ON
ON
Hi1
Lo1
Temp.
Pr1
Example of absolute alarms H1 and
L1
referred to
Pr1
.
Or they will be the values given by the sum of the
reference Set Point and the alarm thresholds if the
alarms are relative (
A.y1
,
A.y2
=
2
, 4).
For example if
A.y1
=
2
the intervention thresholds will be
[
SP1
+
A.H1
] and [
SP1
+
A.L1
] and if
A.y2
=
4
the inter-
vention thresholds will be [
SP2
+
A.H2
] and [
SP2
+
A.L2
].
A.L1
SP1
A.H1
Temp.
A.A1
A.A1
time
off
off
off
ON
ON
Hi1
Lo1
AL1
Pr1
Example of relative alarms H1 and
L1
referred to
Pr1
.
Note:
In the case
Sp2
Set Point is set as relative to
SP1
(
S.Sc
=
2r
) and an alarm is set relative to
SP2
(eg.
A.y2
=
4
) the effective intervention thresholds will
be [
SP1
+
SP2
+
A .H2
] and [
SP1
+
SP2
+
A.L2
].
The maximum and minimum temperature alarms can be
disabled setting
A.H1
/
A.h2
/
A.L1
/
A.l2
=
oF
.
The intervention of temperature alarms causes: the lighting
up of the
LED to signal the alarm, the activation of the
outputs configured with an alarm function and if configured,
the internal buzzer activation.
5.10.2 External Alarm from Digital Input
The instrument can notify an alarm external to the instrument
when the digital input configured
i.Fi
=
1
or
2
is activated.
Simultaneously to the configured alarm signal (buzzer and/or
output), the instrument points out the external alarm lighting
up the
LED and displaying the label
AL
alternated to the
variable set at parameter
i.dS
.
i.Fi
=
1
mode produces no action on the control outputs
while with
i.Fi
=
2
the control outputs are disabled at digital
input intervention.
