44
ENG
Hecu CO
2
+0300085EN rel. 2.2 - 07.05.2019
7.4 Connecting MPXPRO/Ultracella
controllers to Hecu
Once having completed the confi guration of the MPXPRO/UltraCella
controllers, the serial network needs to be connected, as shown in the
following diagram:
C1
C2
L1/L L2/N L3 U V W
12 34567 8910
F
PE
C1
C2
AUX
master
MPXPRO
High
voltage
AUX
master
master
EVDEVO EVDEVOmaster
MPXPRO
High
voltage
Fieldbus - Modbus® RS485
max 5 units
Supervisory
system
1
C1
C2
L1/L L2/N L3 U V W
12 34567 8910
F
PE
C1
C2
3
11
12
13
14
RPRV valve
J1
J9
J11
J12
J14
J16
J17
J18
J19
J20
J21
J22
J23
J24
J10
J13
J2
J3
J4
J5
J6
J8
J7
ON
1
2
OFF
RX-/TX-
RX+/TX+
GND
Vout
RX-/TX-
RX+/TX+
GND
Fig. 7.n
To subsequently confi gure the entire system made up of the Hecu
CO2 and MPXPRO/UltraCella controllers, see the Fast Commissioning
procedure described in detail below.
Fast commissioning
Go to screen Eb00 to start the AutoSetup procedure for the
UltraCella/MPXPRO controllers connected to HECU. At the end of the
procedure, screen Eb02 is displayed.
Then on screen Eb03, the capacities can be set for each evaporator, so as
to maximise energy savings with the Floating Suction function
The default parameters are then downloaded, so as to automatically
confi gure the following functions:
• Floating suction pressure set point (par. 6.3): the default values
enable compressor control with fl oating set point on screen Cab01.
The minimum and maximum set point values will be displayed
automatically, in accordance with the type of refrigerant and
application selected, together with the proportional gain and integral
time values required by the controller and already shown in paragraph
6.3.
• Oil Recovery Washing (par. 6.6): the default values enable the
evaporator oil recovery washing function on screen Fab24. The
following parameters manage this function:
Par. Description Def
tON
Washing cycle duration
180sec
tOFF
Time between two washing cycles
180min
Mode
Sequential or together
One cabinet at a time
Fixing time
Stabilisation time after washing
120sec
Tab. 7.o
• Evaporator control parameters: the default values enable the Smooth
Lines evaporator control function and involve the main control
parameters for the evaporators, in screens Ecxx. The main values are
shown in the following table:
Par. Description Def
P3 Superheat set point 10
P4 Valve control: Proportional gain 8
P5 Valve control: Integral time 400
P6 Valve control: Derivative time 0
P7 Low superheat threshold 3
PSM Enable Smooth Lines Enable
Plt Off set to stop control below set point (Smooth Lines) 4
Phs Maximum superheat off set (Smooth Lines) 9
PSP Smooth Lines: Proportional gain 3.0
PSI Smooth Lines: Integral time 360.0
PSD Smooth Lines: Derivative time 0.0
Tab. 7.p
Note: all of the values indicated as defaults by the Fast
Commissioning procedure can be modifi ed to optimise overall system
operation. It is recommended to change one parameter at a time and
then evaluate the eff ects for at least 10 minutes.
MPXPRO/UltraCella control
Once having connected the MPXPRO controllers to Hecu, the control
parameters will be on screens Ec01-02-03-04 for the fi rst evaporator.
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