18
ENG
easy/easy compact/easy split +030220791 - rel. 3.2 - 13.07.2010
/6: disable decimal point
Used to enable or disable the temperature display with the resolution to
the tenths of a degree between -20 and + 20 (easy and easy split) or -10
and +10 (easy compact).
/6= 0 temperature displayed to the tenth of a degree;
/6=1 temperature displayed without the tenths of a degree.
Note: the decimal point is only disabled in relation to the reading
shown on the display (the calculations performed by the controller
remain unchanged).
/7: enable probe 2 alarm (M models only)
In the thermometer models (M), tted with two probes, setting /7= 1
enables the alarm relating to the second probe (E1).
4.3 Temperature control
The following parameters are used to control the temperature: St, r1, r2,
r3, r4 and rd.
St: set point, r1 minimum value and r2 maximum value of the set
point
Parameter St determines the desired temperature to be maintained inside
the cabinet or cold room (set point). Parameters r1 (minimum value) and
r2 (maximum) set the range of temperatures for setting the set point.
Note: the set point can be set by pressing the SET button (see par.
“Setting the set point (desired temperature value)” page 16).
r3: select direct/reverse operation
De nes the operating mode of the device:
• r3=0: direct with defrost. Used to request the activation of the
compressor when the temperature measured by probe 1 rises above
the set point. This mode also includes defrost (also called “cooling”
mode, see Fig. 4.a)
• r3=1: direct without defrost (Fig. 4.a)
• r3=2: reverse without defrost (Fig. 4.a). Used to request the activation
of the compressor when the temperature measured by probe 1 falls
below the set point. This mode does NOT include defrost (also called
“heating” mode, see Fig. 4.a).
“Direct” mode (cooling) “Reverse” mode (heating)
OFF
ON
set point
rd
1
2
OFF
ON
set point
rd
1
2
Fig. 4.a
Key:
1. compressor request;
2. probe 1
Important: the operating mode can also be set by external
contact connected to the multifunction digital input (parameter
A4=9). In this case, the contact controls operation (direct/reverse) with
priority over parameter r3.
r4: night-time set point delta
Value that automatically increases the set point temperature during the
night-time operation time bands.
r4=0: night-time set point= St
r4>0: night-time set point= St + r4
Important:
1. to enable night-time operation, not only does r4 need to be set >0, but
the digital input must also be enabled and con gured (see parameter
A4=4 curtain switch/night-time operation) or a night-time time band
enables (see par. “4.11 Clock and time band parameters” page 28);
2. night-time operation does not necessarily mean at night, but rather
the time bands in which the value of the set point is modi ed. This
usually corresponds to the period in which the refrigerated cabinet is
not used (shop closed) and when the curtain is down.
rd Control di erential
Value that is added to (or subtracted from, in ‘reverse’ mode) the
temperature set point.
rd= low values:
• more precise temperature control;
• high compressor On/O switching frequency in the event of minimum
temperature deviations (with the risk of causing damage).
rd= high values:
• less precise temperature control;
• low compressor On/O switching frequency in the event of minimum
temperature deviations.
Important: the compressor can also be safeguarded using the
parameters that limit the number of activations/hour and the
minimum o time (see par. “4.6 Compressor protection” page 19).
4.4 Duty Setting
Safety function that ensures the operation of the compressor even in the
event of a control probe fault. If alarm E0 occurs, duty setting ensures the
operation of the compressor until the fault is resolved. The compressor,
not being able to be activated according to temperature, works cyclically
with an ON time equal to the value assigned to parameter c4 (in minutes)
and a xed OFF time of 15 minutes, see Fig. 4.b.
ON
OFF
C4
compressor
C4
OFF= 15 min.
Fig. 4.b
c4: compressor on time with duty setting
c4= 0 in the event of an ambient probe fault, the
compressor will be always o
c4= 100
(c4=99
for easy compact)
the compressor will remain always on; and the
15 minute o time is not considered.
0<c4<100
(0<c4<99
for easy compact)
at the moment a probe error (E0) is detected, the
duty setting cycle starts from the current status
of the compressor (that is, the status of the
compressor is maintained) and the time already
elapsed is ignored. The compressor times set by
parameters c1, c2, c3 are always observed.
Table 4.d
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