Control - Carel MPXPRO User Manual

ENG
Auxiliary / light serving the Master on the Slaves (H1, H5, H7 = 4/6)
From the Master, the action of the auxiliary output is propagated via tLAN
to the Slaves whose digital output is confi gured as H1=4, for the auxiliary
output, and H1=6 for the light output.
Auxiliary evaporator defrost (not compatible with electronic
expansion valve management)
A heater can be activated to perform a heater defrost on the main and
auxiliary evaporator.
T
V
M
SV
T
V
Key
E Evaporator with electric defrost
V Thermostatic expansion valve
MPXPRO can manage defrosts with one or two outputs and one or two
end defrost probes. The table below summarises the possible cases:
Defrost Evaporator

Control

outputs probes
1 1 normal
defrost managed on two outputs with reference to
2 1
the same evaporator probe
defrost managed on the same output with
1 2 reference to two evaporator probes (minimum
evaporation temperature)
defrost managed independently on the two
2 2
evaporator circuits
Par. Description
Sd1 Defrost probe
Sd2 Secondary evaporator defrost probe
Evaporator fans
This confi guration involves using the auxiliary output for the evaporator
fans; the activation/deactivation of the evaporator fans is signalled by the
evaporator fan icon on the display. See paragraphs 5.7 and 6.8.
Anti-sweat heaters
This confi guration involves using the auxiliary output to demist the
display cases (control with fi xed activation, see paragraph 6.3).
MPXPRO - + 0300055EN rel. 1.0 30/08/10
MASTER
CAREL MPX PRO
!
MPXPRO
E
E
Fig. 5.d
SV Solenoid valve
Tab. 5.k
Def Min Max
- - -
- - -
Tab. 5.l
Suction and equalizing valve
This confi guration involves using the auxiliary output as a suction or
balancing valve for hot gas defrosts. See paragraph 5.6.
Liquid solenoid valve
Available only for R1 AUX4 (modifi able only with H13), used to activate
the liquid solenoid valve when ultracap technology is not available or in
applications with thermostatic valves.
NB: the solenoid function in the instrument is always active, even if the
corresponding output is not confi gured. The icons and variables on the
supervisor will thus refl ect normal operation of the instrument
5.5 Control
Introduction
There are various modes for controlling air temperature for the
conservation of foodstuff s in cold rooms and showcases. The following
fi gure shows the position of the intake probe Sr and the outlet probe
Sm. The virtual probe Sv is a weighted average of these two, based on
parameter /4, according to the following formula:
Sv =
Par. Description
/4 Virtual probe composition
0 = outlet probe Sm
100 = intake probe Sr
For example if /4=50, Sv=(Sm+Sr)/2 represents the estimated value of the
air temperature around the food being cooled.
Example: vertical showcase
UoM
°C/°F
°C/°F
Key
Sm Outlet probe
Sr Intake probe
34
Sm Sr
Def Min
0 0
DAY
Sm
Sv=(Sm+Sr)/2
Sr
Fig. 5.e
Sv Virtual probe
Max UoM
100 %
Tab. 5.m