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A1 r01-r12 A4
r01
r01
r03+r07 r03 r03+r07-4
r08
r09
r03 r03+r12
r10
r11
r18
50
40
30
20
10
r18
1
2
3
4
5
6
7
ENGLISH
μC 2 SE - +030220426 - rel. 2.1 - 09.06.2010
In heating:
With autotuning active and inlet control, this represents the delay from switching the compressor
off to reach the outlet set point, before the next deactivation.
- Compressor deactivation diff erential (if r06 = 4)
r12:
This represents the temperature diff erential for the deactivation of the compressors,
according to the procedure described in “Deactivation time”.
Deactivation time (cooling) Fig. 5.b.f
In the same way as for the activation time, the deactivation time also varies between a maximum
value, set for the parameter r10 and corresponding to the set point temperature, and a minimum,
set for the parameter r11 corresponding to the end of the diff erential for the deactivation of the
compressors, set by the parameter r12.
Below this value, the deactivation time will be equal to the minimum set until reaching the
temperature A04, after which all the compressors will be switched OFF, irrespective of the times.
As the temperature moves away from the set point, the response of the process becomes more
dynamic.
Activation time (heating) Fig. 5.b.g
In heating mode, the activation time will increase as the deviation from the set point increases.
The set point is the heating set point r03 with the corresponding diff erential r04. The parameters
for setting the activation times are always r08 and r09.
Deactivation time (heating)
In heating mode, if the temperature rises above the set point, the deactivation time will decrease
more the further the temperature moves away from the heating set point r03. At the end of the
diff erential r12, the time will be the minimum set by parameter r11.
- Minimum Cooling set point
r13:
Establishes the minimum limit for setting the Cooling set point.
- Maximum Cooling set point
r14:
Establishes the maximum limit for setting the Cooling set point.
- Minimum heating set point
r15:
Establishes the minimum limit for setting the heating set point.
- Maximum heating set point
r16:
Establishes the maximum limit for setting the heating set point.
- Cooling compensation constant (chiller mode):
r17:
Sets the coeffi cient that controls the cooling compensation algorithm. In cooling mode,
if r17 is positive, the set point increases as the outside temperature increases (measured by
the outside probe); if on the other hand r17 is negative the set point decreases as the outside
temperature increases.
This diff erence in the set point from the set value can have a maximum absolute value equal to
the setting of r18. The values for the parameters shown on the graph are: r17=±2, r01=25, r19=32
and r18=5).
Key:
1. temperature;
2. time;
3. external temperature (probe B3/B4);
4. comp. start temperature (r19);
5. positive compensation (r17= 2);
6. set point (r1);
7. negative compensation (r17=-2).
Fig. 5.b.f
Fig. 5.b.g
Fig. 5.b.h
Fig. 5.b.i
deactivation time
temperature
time
compressor
compressor
stop
deactivation time
activation time
temperature
time
deactivation time
temperature
time
comp.
deactivation time