The table below describes the possible fault situations relating to the control probes and the function
that is activated.
Type of system Control probe fault Control Parameter
Sm Sr
1 probe
Duty setting c4
Duty setting c4
2 probes
control on Sr ro(*)
control on Sm ro(*)
Duty setting c4
* ro must be > 0.
Duty setting with shared control status
The activation of the duty setting mode is signalled on the Master user interface by the
solenoid/compressor icon on steady; the Slave controllers ignore the Master control mode. On the other
hand, if a Slave activates duty setting mode due to lack of communication with the Master, the Slave
manages the display on the user interface as envisaged.
Note:
l Activation of duty setting mode on the Master controller implies that all the related Slaves observe
the Master controller compressor management times.
l in duty setting mode, the compressor protection times are ignored.
Continuous cycle (parameter cc)
Continuous cycle is a function used to keep the refrigeration cycle active continuously for a settable
duration, irrespective of the temperature inside the unit. This may be useful when requiring a rapid
decrease in the temperature, even below the set point. Activation of the low temperature alarm when
exceeding the threshold AL or AL2 can be delayed by setting parameter c6.
Important: the unit of measure of parameter cc is hours
Code Description Def Min Max UOM User
User
terminal
cc
Running time in continuous cycle
0 = Disabled
1 0 15 hours M NO
c6 Low temp. alarm bypass time after continuous cycle 60 0 240 min M NO
The continuous cycle is activated using the direct continuous cycle function on the user terminal (see the
paragraph "Direct functions"), from the supervisor or via digital input. When the continuous cycle is
running:
l
the + icons are displayed.
l the solenoid/compressor valve output (with icon) and electronic valve control are activated;
l the low temperature alarm with threshold AL is enabled relating to the probe defined by parameter
AA as well as the low temperature alarm with threshold AL2 relating to the probe defined by
parameter AA2.
Important: for the correct activation of the low temperature alarms, set the parameters as follows:
l AA = outlet probe (air off);
l AA2 = intake probe (air on).
Note:
1. The continuous cycle cannot be activated if:
l the duration of the continuous cycle is set to 0 (cc=0);
l the measurements of the probes defined by AA and AA2 have exceeded their respective
thresholds AL, AL2;
l the device is OFF.
2. The continuous cycle remains in standby if:
l the compressor protection times are set (c1, c2, c3);
l the immediate or delayed alarm from external digital input delays activation of the solenoid
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