Carel Clima User Manual download pdf (Page 43)

43“MPXPRO” +030220186 - rel. 1.0 - 22.05.2007

OFF

regolation

OFF = 15 min.

Fig. 6.e

E N G L I S H

c4 ON time for duty setting operation (tOFF= 15 min ﬁxed)

Code UOM Min Max Def.

c4 min 0

100 0

IIn the event of alarms on the components of the control probes, c4 allows the controller to be operated

awaiting the resolution of the fault. As the controller cannot adapt operation based on the temperature

inside the refrigeration unit, it operates for a time equal to c4 (ON time) and stops for a ﬁxed time of 15

min (OFF time). The ON time may last from 0 to 100 minutes:

c4=0 control always on

c4=100 control always off

With the duty setting active, during the ON time the icon remains on, while ﬂashes during the off sta-

tus. The table below describes the possible error situations on the components of the control probe in various

types of systems (with one or two probes).

Examples of systems Control probe fault Action of MPXPRO Parameter

Sm Sr

System with just one

probe

Duty setting c4

System with two

probes

Control with Sr ro(*)

Control with Sm ro(*)

Duty setting c4

Tab. 6.f

(*) in MPXPRO the changeover to the other probe in the event of faults is automatic if ro > 0.

Note: In duty setting mode, the compressor times are ignored.

6.2.3.3 Continuous cycle

IThe continuous cycle is a special function on MPXPRO that is 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, including below the set point.

The continuous cycle is activated by pressing the UP & DOWN buttons more than 5 seconds, or from the

supervisor.

The continuous cycle cannot be activated if:

the duration of the continuous cycle is set to 0 (cc=0);

the control temperature is less than the low temperature threshold AL (AL2 in double thermostat);

the device is OFF.

When the continuous cycle is running:

the solenoid output and valve control are activated, and the icon is shown on the display;

the low temperature alarm AL (AL2 in double thermostat) is active;

Note: Opening the door (digital input) stops the cycle. When closing the door again, system resumes

from the previous status.

The continuous cycle remains in standby if:

the compressor protection times are set (c1, c2, c3);

the immediate or delayed alarm from external digital input delays the activation of the compressor;

defrost, dripping, post-dripping are active;

the door is open (in the same way as described previously).

The continuous cycle ends when:

pressing the UP & DOWN buttons for more than 5 seconds;

supervisor;

the low temperature threshold is reached (AL or AL2 in double thermostat);

end of the continuous cycle duration cc;

controller switched off from the supervisor (logical OFF).

cc “Continuous cycle” operation duration

Code UOM Min Max Def.

cc ore 0

15 1

This determines the compressor operating time in continuous cycle. During the time set for cc, the com-

pressor will continue operating so as to rapidly decrease the temperature (including below the set point).

cc=0 Continuous cycle deactivated

c6 Low temperature alarm bypass time after “continuous cycle“

Code UOM Min Max Def.

c6 min 0

240 60

This determines the time in minutes during which the temperature alarm is disabled after the continuo-

us cycle. If the temperature in the refrigerated unit, at the end of the continuous cycle, falls below the

threshold AL (or AL2 in double thermostat), c6 delays the temperature alarm for the time set for the

parameter.

When c6 elapses, any temperature alarms are only activated after Ad

•

A@ ro: Control offset in the event of probe error, p. 41A@ ro: Control offset in the event of probe error, p. 41

B@ AL: Low temp. alarm threshold, p. 33

A@ AL2: Low temp. alarm threshold on intake probe Sr,

B@ AL: Low temp. alarm threshold, p. 33

A@ AL2: Low temp. alarm threshold on intake probe Sr,

p. 58

B@ Ad: Delay time for high and low temperature alarms,

p. 33

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 71 72

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