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6.6 Continuous cycle
Par.
d0
To activate the continuous cycle by keyboard see Chapter 3 (parameter
value cc> 0). During operation in a continuous cycle, the compressor
continues to operate regardless the control, for the time “cc”, to lower the
temperature even below the set point. The continuous cycle is stopped
after the time “cc” or when reaching the minimum specified temperature,
corresponding to the minimum temperature alarm threshold (AL). If,
after the end of the continuous cycle, the temperature falls below the
minimum temperature threshold, the low temperature alarm signal can
be ignored by suitably setting the c6 parameter: the alarm bypass delay
time after continuous cycle.
Par.
cc
c6
A5
A9
Description
Continuous cycle duration
Low temperature alarm delay after
continuous cycle
Digital input configuration 2 (DI2)
…
14 = Continuous cycle activation
Digital input configuration 3 (DI3)
…
14 = Continuous cycle activation
Def
0
2
Min
0
0
Max
15
250
U.M.
hour
hour
0
0
14
-
0
0
14
-
dt1
dt2
dP1
dP2
d6
Description
Type of defrost
0 Heater by temperature
1 Hot gas by temperature
2 Heater by time
3 Hot gas by time
End defrost temperature, main
evaporator
End defrost temperature, auxiliary
evaporator
Maximum defrost duration
Maximum defrost duration, auxiliary
evaporator
Terminal display during defrost
0 = Temperature alternated with dEF
1 = Last temperature shown before
defrost
2 = dEF
Def
0
Min
0
Max
3
U.M.
-
4
-50
200
°C/°F
4
-50
200
°C/°F
30
30
1
1
250
250
min
min
1
0
2
-
Sd
dt1
dt1-1
t
6.7 Door switch control
ON
d0=0, 1
DEF
See chap. 4
OFF
t
d0=2, 3
ON
DEF
6.8 Defrost
OFF
Introduction
These parameters (dd1…dd8) can be used to set up to 8 defrost events
linked to the system clock (RTC)
Par.
dd1…8
hh1…8
nn1…8
Description
Defrost 1…8: day
0
Disabled
1…7 Monday…Sunday
8
From Monday to Friday
9
From Monday to Saturday
10 Saturday and Sunday
11 Daily
Defrost 1…8: hour
Defrost 1…8: minute
Def
0
Min
0
Max
11
dP1
Fig. 6.h
U.M.
-
Key
t
dt1
dP1
Sd
d0
DEF
0
0
0
0
23
59
t
Time
End of defrost temperature
Maximum defrost duration
Defrost Probe
Type of defrost
Defrost
hour
min.
UltraCella allows you to manage the following types of defrost, depending
on parameter d0:
0. electric heater defrost by temperature (placed near the evaporator);
1. hot gas defrost by temperature.
2. electric heater defrost by time;
3. hot gas defrost by time.
1. electric heater defrost (d0 = 0, 2): operating cycle.
The operating cycle refers to default values of the parameters F2 and F3.
C
CMP
Note: Ed1 and Ed2 indicate that the defrost ended due to timeout.
L
The end of the defrost cycle can be by temperature, and in this case it is
necessary to install the defrost probe Sd (to select between B2 and B3) or
by time. In the first case the defrost ends if the probe Sd measures a value
greater than the value of dt1 or dP1 time has elapsed, in the second case
if the defrosting phase exceeds the maximum time dP1. At the end of
the defrost the controller can enter in dripping status (present if dd> 0),
in which the compressor and the fans are turned off, and subsequently in
the state of post-dripping (if present Fd> 0), in which the control resumes
with fans off. You can choose the display on the user terminal during
defrost, using parameter d6.
F
S
PDV
T V2
M
B3
E
Fig. 6.i
39
UltraCella +0300083EN - rel. 1.3 - 30.06.2014