Analogue Outputs; Digital Outputs - Carel MPXPRO User Manual

Note:
• when resuming control, the compressor protection times are observed
(see the advanced functions, compressor parameters);
• if the door remains open for a time greater than the value set for
parameter d8, control is resumed in any case. The light remains on, the
value shown on the display fl ashes, the buzzer and the alarm relay are
activated, and the temperature alarms are enabled, with the delay Ad.
Par. Description
d8 Bypass high temperature alarm time after
defrost and door open
6 = Remote ON/OFF
When the controller is OFF:
• the display shows the value measured by the probes set (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;
• switching ON from the keypad, supervisor or remote control is ignored.
When the controller is ON again, all the functions are reactivated, except
for the defrost on start-up and compressor and evaporator fan delay on
power-up (parameter c0).
Note:
• if more than one input is confi gured as the remote ON/OFF, the off
status of one any of these determines the off status of the device;
• the FF control from digital input has priority over the keypad and the
supervisor;
• if the controller remains OFF for longer than the value set for basic
parameter dI, when the controller is switched back on a defrost is
performed.
7 = Curtain switch/light
During night status:
• the night-time set point Stn is used for control, calculated based on
the set point St plus the off set defi ned by parameter r4 (Stn = St + r4).
In addition, if necessary the control probe is changed based on the
confi guration of parameter r6 (0 = virtual probe, 1= intake probe);
• the AUX or light output is deactivated based on the setting of
parameter H8.
During day status:
• normal operation resumes: set point = St, virtual probe used as control
probe;
• activation of the AUX or light output based on the setting of parameter
H8.
Par. Description
H8 Output switched with time bands
0 = Light; 1 = Aux.
8 = Continuous cycle
When the contact closes the continuous cycle is activated, parameters cc
and c6 (see the Advanced functions). The continuous cycle ends when
the contact opens again.
9 = Light sensor
The light sensor converts the light signal into a value, which is processed
and compared against the threshold set for parameter H12, to determine
changeover from night to day and vice-versa. See paragraph 6.2.
Def Min Max UoM
30 1 240 min
Tab. 5.g
Def Min Max UoM
0 0 1 -
Tab. 5.h
33

5.3 Analogue outputs

The most complete version of MPXPRO (see paragraph 1.1, Models)
features the following analogue outputs: 2 PWM outputs, used as a
control signal to manage loads such as modulating evaporator fans
or anti-sweat heaters. The fi rst output (PWM1) is connected to phase-
cutting speed controller (CAREL code MCHRTF****), the second (PWM2)
to the solid state relay (SSR) output.
MPXPRO can also be fi tted with a driver for stepper electronic expansion
valves or a driver for PWM electronic expansion valves. In this case, the
driver cards, as well as the valve control outputs, also have an additional 0
to 10 Vdc output, which can be used to control variable speed evaporator
fans (brushless or other types with 0 to 10 V input).

5.4 Digital outputs

The most complete version of MPXPRO (see paragraph 1.1, Models)
features 5 digital outputs, called R1, R2, R3, R4, R5. Of these, only R3 is
used for defrost management, the other 4 output, called auxiliary outputs
(AUX), can be confi gured by parameter.s See the table below.
Output Relay Parameter
AUX1 R4 H1
AUX2 R5 H5
AUX3 R2 H7
AUX4 R1 H13
Functions of the digital outputs (Parameters H1, H5, H7)
0 No function
1 Normally de-energized alarm
2 Normally energized alarm
3 Auxiliary
Auxiliary serving the Master on the
4
Slaves
5 Light
Light serving the Master on the
6
Slaves
(*) only for R1-AUX4
Normally de-energized/normally energized alarm
With reference to the general connection diagram in paragraph 2.8,
outputs AUX1, AUX2 or AUX3, confi gured as alarm output, can work as:
• normally de-energized: the relay is energized when an alarm occurs;
• normally energized: the relay is de-energized when an alarm occurs;
Note: operation with the relay de-energized when an alarm occurs
ensures maximum safety when the alarm is due to a power failure
or disconnection of the power cables.
Auxiliary / light (H1, H5, H7 = 3/5)
The actuator can be activated/deactivated using the UP/aux button,
controlled from the supervisor and based on the changeover in day/
night status (linked to the curtain switch or the setting of the time bands);
activation/deactivation of the actuator is signalled by the "Light" icon if
the auxiliary output is confi gured as the light output (H1, H5, H7=5) and
H9=0, or the AUX icon if the AUX output is confi gured as the auxiliary
output (H1, H5, H7= 3) and H9=1. The light or AUX output to be activated
or deactivated based on the night/day time band can be selected (see
parameters tS1...8 and tE1...8).
Par. Description
H9 Select function associated with the "aux"
button on the user terminal
0 = Light
1 = AUX.
ENG
Default function
Evaporator fan output
Normally energized alarm output
Light output
Solenoid output
Tab. 5.i
7 Auxiliary evaporator defrost
8 Evaporator fans
9 Anti-sweat heaters
10 Suction valve
11 Equalizing valve
12 Liquid solenoid valve (*)
Def Min Max UoM
0 0 1
Tab. 5.j
MPXPRO - + 0300055EN rel. 1.1 30/08/10
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