37
ENG
mpxone +0300086EN rel. 2.2 - 13.11.2023
Functions
Activation: to activate sharing of the control status, set /FA = 0 and /Fc = 0 on the MPXone secondary controllers.
Notice:
• the configuration /FA = 0 and /Fc = 0 on a main controller causes the alarm ‘rE’ (control probe alarm)
• if the secondary controller is not accessible from the main, alarm ‘MA’ is displayed (Communication error with the main - only
on the secondary)
The function manages the control status (activation and deactivation of the cooling request) on the secondary controllers from
the main via the LAN (RS485). This means that only the main parameters (set point, differential, night-time set point variation,
control offset in the event of probe error) affect the control algorithm. The value of the same parameters on the secondary devic-
es has absolutely no influence. If the secondary controller is not accessible from the main (the user interface shows alarm ‘MA’),
“duty setting” mode is activated based on the local setting of parameter c4, and the corresponding management (duty setting
starts in the status found prior to the instant it is activated, i.e. it starts with compressor on if this was on, and with compressor
off if it was off ).
Notice:
• if the main controller enters duty setting mode, the secondary controllers follow this based on their compressor management
times. Otherwise, the user terminal is managed if the secondary controller goes into duty setting mode due to no commu-
nication with the main; the secondary activates the corresponding icon on the user interface when it is in duty setting mode
due to no communication with the main;
• activation of continuous cycle on the main means all the dependent secondary devices observe the compressor manage-
ment times set on the main (parameter cc on the main only will take effect, while the settings on the secondary devices will
be ignored). This operating mode is only highlighted on the main user terminal, as the secondary controllers ignore the main
control mode. This means that a secondary controller serving the main, even in the continuous cycle, manages the user inter-
face as if it were in normal control (solenoid/compressor icon on during cooling request and off when no request). Attempts
to activate continuous cycle on a secondary serving the main are ignored, both local and sent from the main.
Calibration (parameters /cA to /co)
MPXone features the possibility to calibrate values read by the probes associated with the various functions set by parameters /
FA to /Fn and some internal variables. In particular, parameters /cA, .../cn, /cc are used to increase or decrease the values read by
the probes connected to the analogue inputs across the range of measurement. Parameter
/cE, on the other hand, corrects the value of the saturated evaporation temperature calculated directly based on the evaporation
pressure.
Caution, HACCP:
this modification may not be allowed by HACCP procedures as it alters the measured value. Verify that
you have authorisation and record the changes where required.
300086_050_R01
A
T1
T2
min max
Ref. Description
T1 Outlet temperature read by the probe
T2 Outlet temperature (value corrected by T1 with offset A)
A Offset (parameter /ca for outlet probe)
min, max Field of measurement
Fig. 5.b Tab. 5.d
Code Description Def Min Max UOM User User terminal
/cA Outlet temperature probe (Sm) calibration 0 -20 20 °C/°F S NO
/cb Defrost temperature probe (Sd) calibration 0 -20 20 °C/°F S NO
/cc Intake temperature probe (Sr) calibration 0 -20 20 °C/°F S NO
HACCP, caution:
modifying the parameters that influence temperature measurement and display may not be allowed in
certain applications (e.g.: HACCP).
/2: Analogue probe measurement stability
Code Description Def Min Max UOM User User terminal
/2 Analogue probe measurement stability 9 1 15 - M NO
Defines the coefficient used to stabilise the temperature measurement. Low values assigned to this parameter allow a prompt
response of the sensor to temperature variations; the reading however become more sensitive to disturbance.. High values slow
down the response, but guarantee greater immunity to disturbance, that is, a more stable, precise and filtered reading.
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