User manual

ManualsBrandsCarel ManualsMusical equipmentMPXPRO

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MPXPRO - + 0300055EN rel. 1.3 07/03/13

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 Def Min Max UoM

d8 Bypass high temperature alarm time after

defrost and door open

30 1 240 min

Tab. 5.g

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 Def Min Max UoM

H8 Output switched with time bands

0 = Light; 1 = Aux.

001-

Tab. 5.h

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.

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 Default function

AUX1 R4 H1 Evaporator fan output

AUX2 R5 H5 Normally energized alarm output

AUX3 R2 H7 Light output

AUX4 R1 H13 Solenoid output

Tab. 5.i

Functions of the digital outputs (Parameters H1, H5, H7)

0 No function 7 Auxiliary evaporator defrost

1 Normally de-energized alarm 8 Evaporator fans

2 Normally energized alarm 9 Anti-sweat heaters

3 Auxiliary 10 Suction valve

Auxiliary serving the Master on the

Slaves

11 Equalizing valve

5 Light 12 Liquid solenoid valve (*)

Light serving the Master on the

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 Def Min Max UoM

H9 Select function associated with the “aux”

button on the user terminal

0 = Light

1 = AUX.

001-

Tab. 5.j

Auxiliary / light serving the Master on the Slaves (H1, H5, H7 = 4/6)

From the Master, the action of the auxiliary output is propagated via tLAN

to the Slaves whose digital output is conﬁ gured as H1=4, for the auxiliary

output, and H1=6 for the light output.