Carel MPXone - Page 47

47
ENG
mpxone +0300086EN rel. 2.2 - 13.11.2023
Functions
Normally the weight of /4 is set to 50% and the value of the virtual probe can be chosen for both display and temperature
recording.
The value of the virtual probe thus becomes the mean value of the outlet and intake probes and the measurement that best
corresponds to the produce temperature. Another advantage is automatic adaptation to night-time operation with the curtain
closed, without needing an external signal. When the curtain is open there is immediately an increase in load on the evaporator,
consequently the outlet temperature is lowered so as to keep the average temperature constant.
t
T
night day
Sr
Sm
Sv
300086_053_R01
Ref. Description
T temperature
t time
Sr Intake probe
Sv Virtual probe
Sm Outlet probe
Fig. 5.h
Shared network solenoid
For applications where the solenoid valve is installed only on the main controller, the solenoid output can be confi gured as a
network solenoid output: r7=1 on the main and secondary devices. The valve on the main controller will be open when there is
a cooling request on any of the secondary controllers.
Code Description Def Min Max UOM User User terminal
DOA Select digital input broadcast from main to secondary devices (only on main)
Val. Desc. Val. Desc.
0 not confi gured 4 digital output 3 (NO3)
1 digital output 1 (NO1) 5 digital output 4 (NO4)
2 digital output 2 (NO2)
304- S NO
r7 Main solenoid valve confi guration
0/1 = local valve/network valve (connected to main)
001- S YES
If confi gured as the network solenoid, the valve is:
• open: if at least one of the controllers requires cooling;
• closed: if there is no control request or if at least one of the controllers has a serious valve alarm (low superheat, low suction
temperature, high evaporation pressure), when suitably confi gured. See parameters P10 and PM5.
Notice: on main/secondary networks with a shared solenoid valve, parameter r7 must be correctly set on all of the devices
(r7=1).
Code Description Def Min Max UOM User User terminal
P10 Enable close solenoid valve for low superheat (LowSH) and/or low
suction temperature (LSA)
1 = closing enabled
001- MNO
PM5 MOP: close solenoid valve 0/1 = No/Yes 001- SNO
300086_012_R01
M
P
T
T
EEV
E
E
EEV
SV
Secondary
M
P
T
T
Main
EEV
E
E
EEV
EVD
mini
EVD
mini
SV
Secondary
Main
J14
J14
advanced
advanced
Fig. 5.i
Ref. Description Ref. Description
E Forced-air evaporator P Evaporation pressure (PEu)
SV Solenoid valve T Superheated gas temperature (tGS)
EEV Electronic expansion valve