Carel ir33 Universale series User Manual page 43

Par Description
c10 Status of the control outputs with
probe alarm
0=All outputs OFF
1= All outputs ON
2="Direct" outputs on, "reverse" off
3="Reverse" outputs on, "direct" off
8.5.2 Alarm parameters and activation
P25 (P26) is used to determine the activation threshold for the low (high)
temperature alarm E05 (E04). The value set for P25 (P26) is continuously
compared against the value measured by probe B1. Parameter P28
represents the "alarm activation delay", in minutes; the low temperature
alarm (E05) is activated only if the temperature remains below the value
of P25 for a time greater than P28. The alarm may relative or absolute,
depending on the value of parameter P29. In the former case (P29=0),
the value of P25 indicates the deviation from the set point and thus the
activation point for the low temperature alarm is: set point - P25. If the
set point changes, the activation point also changes automatically. In the
latter case (P29=1), the value of P25 indicates the low temperature alarm
threshold. The low temperature alarm active is signalled by the buzzer
and code E05 on the display. The same applies to the high temperature
alarm (E04), with P26 instead of P25.
Par Description
P25 Low temperature alarm threshold
if P29=0, P25=0: threshold disabled
if P29=1, P25=-50: threshold disabled
P26 High temperature alarm threshold
if P29=0, P26=0: threshold disabled
if P29=1, P26=150: threshold disabled
P27 Alarm diff erential
P28 Alarm delay time
P29 Type of alarm threshold
0=relative
1=absolute
Alarms E04 and E05 have automatic reset. P27 represents the hysteresis
between the alarm activation value and deactivation value.
If Prg/mute is pressed when the value measured is above one of the
thresholds, the buzzer is immediately muted, while the alarm code and
the alarm output, if set, remain active until the value measured is outside
of the activation threshold.
P28 sets the minimum time required to generate a high/low temperature
alarm (E04/E05) or delayed alarm from external contact (E03). To generate
an alarm, the value measured by probe B1 must remain below the value
of P25 or above the value of P26 for a time greater than P28. For an alarm
from digital input (c29, c30=3), the contact must remain open for a time
greater than P28. In the case of an alarm event, a counter starts and
generates an alarm when reaching the minimum time P28. If during the
count the value measured returns within the threshold or the contact
closes, the alarm is not signalled and the count is reset. When a new alarm
condition occurs, the count starts from 0 again.
E05
ON
OFF
P27
P25
Key
E04 High temperature alarm
E05 Low temperature alarm
B1 Probe 1
Def Min Max UoM
0 0 3 -
Def Min Max UoM
-50 -50 P26 °C/°F
150 P25 150 °C/°F
2 0 50 °C/°F
120 0 250 min
1 0 1 -
E04
B1
P27
P26
43
8.5.3 Status of the control outputs with alarm from
digital input (parameter c31)
Parameter c31 determines the action on the control outputs if an alarm
from digital input E03 is active (see c29 and c30). When OFF is selected,
the controller shuts down immediately and the timers are ignored. When
ON is selected, on the other hand, the "Delay between activations of
two diff erent relay outputs" (parameter c6) is observed. If the alarm from
digital input has automatic reset (c29=1 and/or c30=1), when normal
conditions return (external contact closed), the alarm output, if set (see
c0=5) is reset and normal control resumes.
c31=0 all control outputs OFF
c31=1 all control outputs ON
c31=2 only the outputs with "reverse" operation OFF, the others are
not aff ected
c31=3 only the outputs with "direct" operation OFF, the others are
not aff ected.
Par. Description
c31 Status of control outputs with alarm from
digital input
0= All outputs OFF
1= All outputs ON
2="Reverse" outputs
unchanged
3="Direct" outputs OFF, others unchanged
ir33 universale +030220801 - rel. 1.0 - 16.04.2008
ENG
Def Min Max UoM
0 0 3 -
OFF, others