Configuring The Digital Inputs; Duty Setting Selection (Parameters C4 And A6) - Carel MasterCella compact Manual De Utilización

4.4 Configuring the digital inputs

Digital inputs ID1 and ID2 can take on different functioning modes according to the value given to the
parameter A4 (relative to ID1 input), and to A5 (relative to ID2). The main functions are.
Value Meaning
A4 / A5
0 Input non active
1 Immediate external alarm
2 External alarm with delay
3 Enabling of defrost
4 Start of defrost
5 Door switch
6 Remote On-Off
7 Curtain switch

4.4.1 Duty setting selection (parameters c4 and A6)

If the control probe alarm (E0 flashing) is activated, the parameter c4 allows the compressor to function:
• c4=value between 1 and 99: sets the compressor On-time (expressed in minutes), followed by a fixed
Off-time equal to 15 min;
• c4=0: compressor always Off;
• c4=100: compressor always On.
If an external alarm (IA or dA flashing) is activated on the digital input (A4=1; A4=2), the parameter A6 allows
the compressor to function:
• A6= value between 1 and 99: sets the compressor On-time (expressed in minutes), followed by a fixed
Off-time equal to 15 min;
• A6=0: compressor always Off;
• A6=100: compressor always On.
Function
Open Contact = alarm active
Open contact = alarm active. Delay: see parameter A7
Open contact = defrost not enabled
Defrost is activated when the contact closes.
Open contact = open door. When the door is open
the compressor, the evaporator fans and the display
start to flash; the light is activated and the temperature
alarms are deactivated.
After an interval of time that can be selected (d8), the
buzzer begins to sound and the controller start the
normal operation (fan on and compressor on at the
occurance)
Closed contact = ON. This causes the deactivation of
the button on the frontal part of the instrument. When
the control is off, the temperature is displayed, the
protections of the compressor are kept, the LIGHT
button keeps working.
Contact close = curtain down. With r4=3.0 (value
(pre-programmed) the Set Point is increased of
3 degrees with respect to the used value with open
curtain. If the auxiliary output is used for lights
management, the curtain down switches automatically
off the lights while the curtain up switches it on.
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