Ascon Tecnologic - B05B - OPERATING INSTRUCTIONS - PAG. 14
evaporator fan stops the thermal exchange.
Remember that the fans functioning can be conditioned by
the
Door open
function by the digital input.
Output
Fn
LF
FL
Temp.
dF
dF
time
off
off
off
ON
ON
Ep
5.10 Alarm functions
All parameters relative to the alarms are contained in the
-al
group.
The alarm conditions of the instrument are:
–
Probe errors:
E1
,
-e1
,
E2
,
-e2
,
E3
,
-e3
;
–
Temperature alarms:
H1
,
L1
,
H2
,
L2
;
–
External alarm:
AL
,
Pr
,
HP
,
LP
;
–
Open door alarm:
oP
.
The instrument alarm functions work on internal buzzer (if
present and programmed by parameter
bu
) and on the desired
output, if configured by the parameters
o1
,
o2
,
o3
,
o4
de-
pending on what is set at the indicated parameters.
Note:
The
P34
display panel has an alarm LED ( ) that is
ON when the instrument is in alarm.
When present, the buzzer is activated during the alarm (with
bu
=
1
or
3
or
4
) and can be disabled (alarm silencing/ac-
knowledge) manually by pressing any key of the instrument.
The possible selections of output parameters for the alarm
signalling function are:
At
The output is active in alarm and can be disabled (alarm
acknowledge) manually by pressing any key of the
instrument (typical application for sound signal);
AL
The output is active in alarm status, but cannot be disa-
bled manually and is therefore only disabled when the
alarm status ceases (typical application for a light signal);
An
The output is active in alarm status and remains active
even when the alarm has expired (Alarm memory); it can
be disabled (recognition of a stored alarm) manually by
pressing any key when the alarm has expired;
-t
The same function described as
At
but with an in-
verse logic functioning (output active in normal condi-
tion and disabled in alarm status);
-L
The same function described as
AL
but with an in-
verse logic functioning (output active in normal condi-
tions and disabled in alarm status);
-n
The same function described as
An
but with an in-
verse logic functioning (output active in normal condi-
tions and disabled in alarm status).
5.10.1 Temperature alarms
The instrument has 2 fully configurable temperature alarms,
each with a maximum and minimum threshold.
The temperature alarm functions act in response to the
probes readings set at parameters
1y
and
2y
, alarm thresh-
olds set in parameters
1H
,
2H
(high alarms),
1L
,
2L
(low
alarms) and their differentials
1d
,
2d
With parameters
1y
and
2y
it is also possible to define
whether the alarm thresholds
1H
,
2H
,
1L
,
2L
are
absolute
or
relative
to the Set Point.
Depending on the desired operation, parameters
1y
and
2y
can be set to the following values:
1.
Absolute alarm based on
probe
Pr1
temperature with
display of the label (
H
–
L
);
2.
Relative alarm based on
probe
Pr1
temperature with
display of the label (
H
–
L
);
3.
Absolute alarm based on
probe Au
temperature with
display of the label (
H
–
L
);
4.
Relative alarm based on
probe Au
temperature with
display of the label (
H
–
L
);
5.
Absolute alarm based on
probe cd
temperature with
display of the label (
H
–
L
);
6.
Absolute alarm based on
probe
Pr1
temperature, no label;
7.
Relative alarm based on
probe
Pr1
temperature, no label;
8.
Absolute alarm based on
probe Au
temperature, no label;
9.
Relative alarm based on
probe Au
temperature, no label;
10.
Absolute alarm based on
probe cd
temperature, no label.
The following parameters allow to delay the enabling and the
intervention of these alarms.
1P
/
2P
Time periods during which temperature alarms are
disabled at power ON if the instrument is in alarm con-
dition. If there are no alarm conditions at power ON,
o
P
is ignored.
dA
Time period during which temperature alarm 1 is disa-
bled at the end of a defrost.
Note:
During defrosts and for
dA
time after defrosts,
alarm 1 is disabled, whereas during defrosts
alarm 2 is always enabled.
1t
/
2t
Intervention delay for temperature
alarms 1
and
2
.
Temperature
alarms 1
and
2
are enabled at the end of
1P
/
2P
periods and activated after
1t
/
2t
time periods when the
temperature measured by the probe configured for the alarm
rises above or drops below the respective maximum and
minimum alarm thresholds.
1A
/
2A
These 2 parameters allow to define the action of the
alarms on the control and on the alarm outputs (in-
cluding buzzer). This means for example that it is pos-
sible to change the control output directly, deactivating it
if there are temperature alarms on the probes configured
as
Au
(e.g. “antifreeze” function) or as
cd
(e.g. condens-
er “dirty” function).
If both alarms are configured with reference to the same probe,
the instrument allows to control pre-alarm notifications (e.g.
notifications that do not activate the alarm output and/or
the buzzer) and alarm notifications (that activate the alarm
output and/or the buzzer).
The alarm thresholds are the same as those set at parameters
o
H
and
o
L
if the alarms are absolute (
o
y
= 1, 3, 5, 6, 8, 10);
Temp.
1H
1d
time
AL
1L
1d
off
off
off
ON
ON
H1
L1
Pr1
