1. Introduction
MPXone is an electronic controller for centralised commercial refrigeration applications in which a group
of showcases needs to operate in a coordinated manner. The user terminal allows wireless connectivity
with mobile devices and is built- in on the panel mounted models, or sold separately on DIN rail
mounted models. The range includes two versions, basic and medium, which differ regarding the
number of inputs/outputs; both versions have Near Field Connection (NFC) as standard, while Bluetooth
(BLE) is optional on the latter. Power supply is 24 Vac/dc for the panel- mounted models (basic and
medium) and 230 Vac for DIN rail models (medium). CAREL’s “APPLICA” app, available on Google Play for
the Android operating system, makes it easier to configure parameters and commission the unit in the
field.
The solution is completed by the “Spark” PC commissioning tool, used to manage user profiles, configure
parameters and change descriptions of the variables. The possibility to use these two tools
simultaneously, even by different users in separate locations - for example, modify a user profile with
“Spark” in the technical office, and apply it to the system using “Applica”, highlights the potential made
available by the complete package.
1.1
Functions and
main features
MPXone, which shares many of the features already available on the MPXPRO range of controllers, has
been designed to offer maximum flexibility thanks to modular hardware. The medium version, compared
to the basic version:
l
has more analogue and digital inputs and two analogue outputs;
l
can manage an external driver (via Fieldbus serial port) to drive an electronic expansion valve.
The functions that can be assigned for the various analogue inputs are those required to control the
refrigeration unit temperature - outlet (air off), intake (air on) and defrost probes - plus control of
superheat, saturated evaporation temperature, defrost on the second evaporator, ambient temperature
and humidity and glass temperature. In addition, up to four virtual probes are available, physically
connected to other devices and shared via the supervisor, and can be used to manage one of the specific
functions listed above. The two analogue outputs available on the medium model can be used to control
the speed of the evaporator fans and/or to modulate the anti-sweat heaters. The digital inputs can be
used for day/night switching, defrost calls, the door or curtain switch or activating alarms and other
special functions. The four digital outputs (relays) can be configured to control activation of the solenoid
valve/compressor, evaporator fans, defrost, lights and/or alarms.
Main features:
l
compact structure: panel and DIN rail version;
l
24 Vac/dc power supply for the panel version and 115/230 Vac for the DIN version;
l
hardware equipped with two 0- 10 V modulating outputs for managing anti- sweat heaters and
evaporator fans (medium version);
l
possibility to control an external driver for driving an electronic expansion valve (medium version);
l
NFC wireless connectivity as standard (Bluetooth optional on the medium version);
l
commissioning tool to optimise configuration of the controller;
l
possibility to set-up a master/slave network (up to 9 slaves);
l
integrated RS485 serial port for connection to supervisors and remote service systems (CAREL or
Modbus protocol);
l
Smooth Lines function for modulating evaporator capacity according to cooling demand (medium
version);
l
advanced superheat control with low superheat (LowSH), low/high evaporation temperature
(LOP/MOP) and low suction temperature (LSA) protection;
l
defrost activated via keypad, digital input, network signal from Master, supervisor or scheduled with
built-in RTC;
l
management of various types of defrosts, on one or two evaporators: heater, natural (compressor off)
l
smart defrost functions;
l
coordination of network defrosts;
l
management of cabinet lights and curtain;
l
digital input broadcast from Master to Slaves;
l
display of Slave alarms on Master;
l
sharing of one or more network probes;
ENG
0300086EN rel. 1.0 – 04.09.2018
1. Introduction |
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