Carel Clima User Manual download pdf (Page 56)

56 “MPXPRO” +030220186 - rel. 1.0 - 22.05.2007

E N G L I S H

dS1 Compressor off time in “Sequential stop” defrost mode

Code UOM Min Max Def.

dS1 min 0

45 0

This represents the initial counter starting time in relation to the control stop time and the effective stop

time when reaching the maximum time ‘dS2’ for the activation of control.

dS1 = 0 Sequential stops disabledi

dS2 Compressor operating time in “Sequential stop” defrost mode

Code UOM Min Max Def.

dS2 min 0

240 120

This represents the value initial counter starting time in relation to the control operating time, after which

a natural defrost is performed in sequential stops mode.

dS2 is only active if dS1≠ 0.

• Power defrost

Power defrost is a special function on the MPXPRO that increases the end defrost threshold dt1 (dt2 for

the second evaporator) and/or the maximum defrost duration dP1 (dP2 for the second evaporator). The-

se increases allow longer and more effective defrosts. Power defrosts are performed upon each defrost

call in night status or when suitably conﬁgured by the RTC parameters (td1 to td8), to allow the user to

choose the most suitable conditions for this special procedure. Power Defrost is enabled when at least

one of the set increases, ddt or ddP, is other than zero.

ddt Additional end defrost temperature delta in “Power defrost” mode”

Code UOM Min Max Def.

ddt °C/°F -20.0

20.0 0.0

This sets the temperature value that is added to the end defrost threshold dt1 (dt2 for the auxiliary

evaporator).

Example. ddt = 0 °C: increased threshold not active in Power defrost

ddP Additional maximum defrost time delta in “Power defrost” mode”

Code UOM Min Max Def.

ddP min 0

60 0

This represents the time that is added to the maximum defrost duration dP1 (and dP2 for the auxiliary

evaporator).

Example. ddP= 0: increased duration not active in Power defrost

Example 2. If ddt>0 and ddP>0, then Power Defrost mode is enabled for both temperature and duration.

In this mode, any defrost calls when the controller is in night status or due to the RTC settings (td1 to td8)

with attribute P=1 modify the default settings.

The end defrost threshold temperature becomes

dt1P = dt1 + ddt

The maximum duration of defrost becomes

dP1P = dP1 + ddP

This effect is naturally extended to the second evaporator (dt2 and dP2).

6.6 Fan speed modulation

6.6.1. List of parameters

Code Parameter

Speed modulation

F5 Fan cut-off temperature (hysteresis 1°C)

F6 Maximum fan speed

F7 Minimum fan speed

F8 Fan peak speed time

F9 Select fan control with PWM output1/2 (with phase cutting speed control)

6.6.2 Speed modulation

MPXPRO can manage a maximum of 3 analogue outputs (this depends on the code of the board used):

− 1 0 to 10 Vdc output on the optional boards

− 2 PWM outputs (12V) on the main board

The modulation of the evaporator fan speed is one of the functions of these outputs and, in particular,

based on the standard factory conﬁguration, modulation is managed using the 0 to 10 Vdc analogue

output on some optional boards. This unit conﬁguration can only be changed using the commissioning

tool or programming key. In this mode, modulation can also be managed using the open collector/PWM

outputs. The modulation management algorithm is independent of the output used.

B@ dt1-dP1: End defrost temperature - Maximum

defrost duration, p.

A@ dt2-dP2: End defrost temperature - MaximumEnd defrost temperature - Maximum

defrost duration, second evaporator, p.

evaporator, p. 54

B@ td1…td8: Defrost events 1 to 8, p. 30

B@ dt1-dP1: End defrost temperature - Maximum

defrost duration, p. 29

A@ dt2-dP2: End defrost temperature - MaximumEnd defrost temperature - Maximum

defrost duration, second evaporator, p.evaporator, p. 54

B@ td1…td8: Defrost events 1 to 8, p. 30

MPXPRO board models, p. 10MPXPRO board models, p. 10

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Carel Clima User Manual Page 56

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