Carel pRack pR300T Mode D'emploi page 47

If gas cooler bypass is managed using a digital output (or ON/OFF analogue output), the bypass function will
reflect the trend shown in Figure 8.
Temperature
measured
of the bypass
Max. deactivation threshold
Di erential Set-point
Set-point
Min. activation threshold
By pass status
1
0
If gas cooler bypass is managed using a modulating analogue output, P+I control is applied, and the related
parameters are configured on screen Eeab31:
•
set point (°C)
•
proportional coefficient Kp (%/°C)
•
integral time (s)
The resulting modulation, for the proportional contribution only, is illustrated in Figure 9.
Analogic output
value by bypass (%)
Start of Deactivat.
the set bypass
Activation
Activation
by bypass
by bypass if the
set time is
elapsed
100
0
Set point -100/K
Deactivat. Start of
bypass the set
Deactivat.
by bypass
by bypass if the
Fig. 4.b
Set point
p
Fig. 4.c
21
ENG
Time
Deactivat.
by pass
Activation
set time is
elapsed
Time
Temperature
after bypass
cod. +030220595 - 1.2 - 13.08.2020