Carel MPXone - Page 40

40
ENG
mpxone +0300086EN rel. 2.2 - 13.11.2023
Functions
Remote ON/OFF (par. DIF)
When the controller is OFF:
• the user terminal shows the value measured by the set probe (parameter /t1) alternating with the message OFF;
• the auxiliary relays set as AUX and light remain active, while the other auxiliary outputs are deactivated;
• the buzzer and alarm relay are deactivated;
• the following are not performed: control, defrosts, continuous cycle, temperature alarm signals;
• the compressor protection times are observed.
When the controller is ON again, all the functions are reactivated, except for the defrost on start-up and compressor and evap-
orator fan delay at power on (par. c0).
Notice:
• the OFF command from digital input has priority over those from the keypad or supervisor;
• if the controller remains OFF for a longer time than the value set for parameter dI, a defrost is performed when the controller
is switched on again.
Code Description Def Min Max UOM User User terminal
DIF Assign remote ON/OFF digital input - see DIA 0 -1 5 - S NO
dI Maximum interval between consecutive defrosts 8 0 240 hours S YES
c0 Delay to enable solenoid/compressor and evaporator
fans at power-on
0 0 240 min M NO
Curtain switch (par. DIG)
During night status:
• the night-time set point Stn is used for control, calculated based on the set point St plus the offset defined by parameter r4
(Stn = St + r4). The control probe can also be modified according to the setting of parameter r6 (0 = virtual probe, 1 = probe),
see the paragraph “Control”;
• the AUX or light output is deactivated according to the setting of parameter H9.
During day status:
• normal operation resumes: set point = St, virtual probe used as control probe;
• AUX or light output activated according to the setting of parameter H9.
Code Description Def Min Max UOM User User terminal
DIG Assign curtain switch digital input - see DIA 0 -1 5 - S NO
H9 Output switched with time bands 0 = Light 1 = AUX 001- SNO
r4 Automatic night set point variation 0 -50 50 °C/°F S NO
r6 Probe for night-time control
0/1 = virtual probe Sv/air on probe Sr
001- SNO
Start/stop continuous cycle (par. DIH)
When the contact is closed, the continuous cycle is activated, based on parameters cc and c6 (see “Functions”). When the con-
tact opens again, the continuous cycle is deactivated.
Code Description Def Min Max UOM User User terminal
DIG Assign curtain switch digital input - see DIA 0 -1 5 - S NO
Timed input (timer) (par. DIL)
The timed digital input is a special configuration that allows, in the transition from not active to active, the activation status of a
specific digital variable to be maintained on the supervisor for a time set by parameter. To enable the function, select the desired
digital input using parameter DIL.
Code Description Def Min Max UOM User User terminal
DIL Assign timed digital input
- see DIA
0-15- SNO
When a digital input is configured as a timed digital input and a transition occurs from not active to active, the BAS_DIL “Timer”
supervisor variable is set to ON and remains ON regardless of the physical status of digital input for the time set by parameter
dIt. Setting parameter dIt to 0 disables the function. The “Timer” variable can be associated with an AUX digital output (relay)
by suitably setting the related parameter DOo to the value 13, thus aligning it with the status of the “Timer” variable. The timed
digital input can be controlled not only by a physical digital input but also from the supervisor using the related digital control
variable, with the same result. The same function can be used to set the “Timer” variable OFF regardless of whether or not the
time set for parameter dIt has elapsed.
Special features:
• when the “Timer” variable is ON, another transition from OFF to ON of the same digital input resets the timeout;
• as it is possible to configure an output as a replica of the “Timer” variable, following a transition of the variable, all of the out-
puts will switch simultaneously.
Code Description Def Min Max UOM User User terminal
dIt Timer duration (timed input) 0 = function disabled 0 0 999 min S NO
DOo Assign timed digital output - see DOA 004- MNO