User manual

43
ENGLISH
ir33 +030220441 - rel. 2.5 - 16.06.10
d12: Advanced auto-adapting defrosts
This parameter is used to enable and disable the advanced defrost function, as per the following table:
d12 Skip defrost Automatic variation of dI
0 Disabled Disabled
1 Disabled Enabled
2 Enabled Disabled
3 Enabled Enabled
Tab. 7.f
Default: d12 =0 => Both the functions are disabled.
dn: Nominal defrost duration
This indicates the average duration of the defrost in normal operating conditions. It is expressed as a percentage, with reference to
parameters dP1 and dP2, according to the following formulae:
dn1 dP1
100
dn
and
dn2 dP2
100
dn
Example: with dn=65, dP1=90 min. and dP2=120 min.
Nominal defrost duration on main evaporator: 59 min.
Nominal defrost duration on auxiliary evaporator: 78 min.
Default: dn=65 => 65% of dP1 or dP2
dH: Proportional factor in the variation of the defrost interval
This parameter is used to increase or decrease the in uence of the e ective duration of the defrost, in relation to the nominal
duration, in the algorithm that manages the automatic variation of the defrost interval. By setting dH=0, the e ective duration has
no in uence on the duration of the defrost interval. Vice versa, dH = 100 achieves maximum e ciency. Default: dH=50
7.5 Alarm management parameters
Code Parameter Model UOM Type Min Max Def.
A0 Alarm and fan di erential MSYF °C/°F C 0.1 20 2.0
A1 Type of threshold AL and AH MSYF  ag C 0 1 0
AL Low temperature alarm threshold MSYF °C/°F F -50 200 0.0
AH High temperature alarm threshold MSYF °C/°F F -50 200 0.0
Ad Low and high temperature signal delay MSYF min F 0 250 120
A4 Digital input 1 con guration (DI1) -SYF - C 0 14 0
M--- - C 0 14 3
A5 Digital input 2 con guration (DI2) MSYF - C 0 14 0
A6 Stop compressor from external alarm -SYF min C 0 100 0
A7 External alarm detection delay -SYF min C 0 250 0
A8 Enable alarms Ed1 and Ed2 -SYF  ag C 0 1 0
A9 Digital input 3 con guration (DI3) - C 0 14 0
Ado Light management mode with door switch MSYF  ag C 0 1 0
Ac High condenser temperature alarm -SYF °C/°F C 0.0 200 70.0
AE High condenser temperature alarm di erential -SYF °C/°F C 0.1 20 5.0
Acd High condenser temperature alarm delay -SYF min C 0 250 0
AF Light sensor OFF time -SYF sec C 0 250 0
ALF Antifreeze alarm threshold MSYF °C/°F C -50 200 -5.0
AdF Antifreeze alarm delay MSYF min C 0 15 1
Tab. 7.g
Note: par. A9 refers to the instruments with 3 digital inputs (ir33DIN, powercompact and MasterCella).
Important warning: for the set times to become immediately operational, the instrument needs to be turned o and on again. If
this operation is not carried out, timing resumes operation the next time it is used.
A0: Alarm and fan di erential
This is the di erential used for disabling high and low temperature alarms (AL and AH - see Figure 7.i) and for managing the fans
(see the F parameters). In the event of an alarm, as can be seen from the  gure, the value of A0 in part determines the e ective
activation points of the temperature alarms. Default: A0=2.0 degrees.
A1: Type of threshold AL and AH
Used to select whether the values of parameters AL and AH are considered absolute thresholds or relative to the value of the set point.
A1 = 0 => AL and AH are considered as relative thresholds.
A1 = 1 => AL and AH are considered absolute thresholds.
Default: A1 = 0 => AL and AH are considered relative thresholds.
AL : Minimum temperature alarm
This is used to determine the activation threshold for the low temperature alarm.
Relative threshold for low temperature alarm = (set point) - (value of AL)
AL=0 => Alarm disabled;
Absolute threshold for low temperature alarm = value of AL.
AL=-50 => Alarm disabled.
Important: If the threshold AL is selected as relative, the value for disabling the alarm is 0, while if selected as absolute, the alarm
disabling value is -50.
Warnings for the relative threshold:
The value of AL does not indicate the actual alarm temperature, but the maximum permissible deviation from the set point; chan-
ging the set point automatically changes the low temperature alarm, while the maximum deviation allowed (=AL ) remains  xed.
Note: the low temperature alarm features automatic reset (this means that if the temperature returns above the minimum value
set, the alarm signal is cancelled automatically).