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ENG
mpxone +0300086EN rel. 2.2 - 13.11.2023
Functions
5.1.3 0 - 10 V or frequency modulation analogue outputs
MPXone has two analogue outputs, Y1 and Y2, in the Medium and Advanced versions (see “Models and accessories” paragraph):
Y1, Y2 can be 0-10 V, PWM or frequency modulation (configurable by parameter). The analogue outputs set as frequency mod-
ulation can be used as a control signal to manage variable-capacity compressors. Y1 and Y2 can also be used to emulate a PWM
digital signal, with a “long” period (seconds) for managing loads such as PWM valves or anti-sweat heaters; in this case, a solid
state relay (SSR) needs to be connected.
Code Description Def Min Max UOM User User terminal
/AA Assign analogue output for modulating evaporator fans
0 = not configured
1 = analogue output 1 (Y1)
2 = analogue output 2 (Y2)
002- MNO
/Ab Assign analogue output for modulating valve - see /AA 002- MNO
/Ac Assign analogue output for modulating anti-sweat heaters
- see /AA
002- MNO
/Ad Assign analogue output for generic modulating function
- see /AA
002- MNO
/AE Assign condenser fan analogue output 002- MNO
/AG Assign modulating compressor analogue output 002- MNO
5.1.4 Digital outputs
MPXone has 4 digital outputs: NO1, NO2, NO3, NO4. To associate the digital outputs with the available functions, set parameters
DOA, DOb, ... DOq to the value of the physical digital output. See the parameter table.
Digital output functions
Digital output assignment for: Par. Default
Solenoid/compressor DOA Digital output 3 (NO3)
Alarm DOb -
Auxiliary DOc -
Auxiliary serving the main on the secondary devices DOd -
Light DOE Digital output 4 (NO4)
Light serving the main on the secondary devices DOF -
Defrost DOG Digital output 1 (NO1)
Auxiliary evaporator defrost DOH -
Evaporator fans DOI Digital output 2 (NO2)
Output associated with the timer function DOo -
Condensate drain heater DOP -
Anti-sweat heater DOQ -
Generic On/Off function (stage) DOS -
Condenser fans DOt
-
Tab. 5.g
Parameters rOb, ..., rOt can be used to reverse the logic of the functions associated with the digital inputs.
Code Description Def Min Max UOM User User terminal
rOA,.. rOt Digital output logic ...
0 = direct, 1 = reverse
001- MNO
Solenoid/compressor (par. DOA)
Used to activate the compressor or use the liquid solenoid valve in applications with a thermostatic expansion valve
Code Description Def Min Max UOM User User terminal
DOA Select digital output for compressor (or solenoid) control
Val. Desc. Val. Desc.
0 not configured 4 digital output 3 (NO3)
1 digital output 1 (NO1) 5 digital output 4 (NO4)
2 digital output 2 (NO2)
1-15- S NO
Alarm (par. DOb)
The relay associated with the alarm function can work as follows:
• normally de-energised: the relay is energised when an alarm occurs (rOb = 0);
• normally energised: the relay is de-energised when an alarm occurs (rOb = 1);
Notice: operation with the relay normally energised (rOb = 1) when an alarm occurs ensures maximum safety when the
alarm is due to a power failure or power cable disconnection.
Code Description Def Min Max UOM User User terminal
DOb Assign alarm digital output - see DOA 004- SNO
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