Functions And Main Characteristics - Carel MPXPRO User Manual

ENG

1.2 Functions and main characteristics

MPXPRO has been designed to off er maximum installation fl exibility
and signifi cant energy saving when fi tted with the CAREL E2V or PWM
electronic expansion valve driver. It features 7 analogue inputs for
probes and 5 digital inputs, confi gurable by parameter. The following
probes can be used: saturated evaporation pressure and superheated
gas temperature probe, required for superheat control, outlet, intake
and defrost probe for showcase temperature control, defrost probe
for the second evaporator, two auxiliary monitoring probes, ambient
temperature probe, glass temperature sensor and humidity probe to
prevent the showcase windows from misting. In the later case the PWM
outputs can be used either to control the glass heaters or the evaporator
fans for air circulation. If the stepper expansion valve is not used, a
second defrost probe can be installed to manage the defrost on a second
evaporator. The 5 digital outputs (relays) can control the compressor/
solenoid valve, evaporator fans, defrost, light and alarm. The digital inputs
can be used for switching between day and night, including from light
sensor, for the defrost calls, for the door or curtain switch or to activate
alarms. By creating a Master/Slave network, a series of functions can be
coordinated, such as defrosts, network solenoid valve management,
sharing of the pressure probe, and sharing of control status.
Example of application on vertical showcase:
EEV
SV (opzionale)
I m p o r t a n t
:
no solenoid valve is
required if the EEV
valve is installed in direct way
and the size is smaller than
E3V45.
Sd
Key:
Sm Outlet probe
Sd Defrost probe
SV Solenoid valve
Below is a description of the series of components and accessories in the
MPXPRO range:
MPXPRO - + 0300055EN rel. 1.0 30/08/10
Sm E
Sd
Sr
Fig. 1.a
Sm
Sr
Fig. 1.b
Sr Intake probe
E evaporator
EEV electronic expansion valve
Master board (MX30M*****)
Fitted with clock (RTC) and RS485 card, this can independently manage a
refrigeration unit, synchronise events over a LAN and connect to a CAREL
or Modbus® supervisory network. Plastic spacers are provided for fi tting
the for electronic valve driver (EEV) expansion board or the 0 to 10 Vdc
output expansion board.
Slave board (MX30S*****)
Without clock (RTC) and RS485 card, these can manage a refrigeration
unit without the supervisor and clock functions. Slave boards can be
converted into Master boards by fi tting in place (see photo) the RTC and
RS485 interface card (MX3OP48500) and setting a parameter (In). Plastic
spacers are provided for fi tting the EEV driver expansion board or the 0 to
10 Vdc output board.
Master/Slave boards (MX30*25HO0)
With 2 PWM outputs and E2V driver board with 0 to 10 Vdc output
incorporated.
8
Fig. 1.c
Connector for
MX30P48500
Fig. 1.d
Fig. 1.e