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Guidelines for setting of PI controller
The tables below show the recommended controller settings:
"Differential-pressure
control"
p
p
p
p
L1
L1
L1: distance in meters between pump and sensor.
"Temperature
Heating
control"
system
0.5
t
L2
L2
0.5
t
1)
In heating systems, an increase in pump performance results
in a rise in temperature at the sensor.
2)
In cooling systems, an increase in pump performance results
in a drop in temperature at the sensor.
L2: distance in meters between heat exchanger and sensor.
"Differential-temperature
control"
t
L2
t
t
t
L2
L2: distance in meters between heat exchanger and sensor.
K
T
p
i
0.5
0.5
L1 < 5 m: 0.5
0.5
L1 > 5 m: 3
L1 > 10 m: 5
K
p
T
Cooling
i
1)
2)
system
-0.5
10 + 5L2
-0.5
30 + 5L2
K
T
p
i
-0.5
10 + 5L2
"Flow control"
Q
"Constant pressure control"
p
p
"Level control"
L
L
Rules of thumb
If the controller is too slow-reacting, increase the gain.
If the controller is hunting or unstable, dampen the system by
reducing the gain or increasing the integral time.
Factory setting
See section
28. Factory
settings.
K
T
p
i
0.5
0.5
K
T
p
i
0.5
0.5
0.1
0.5
K
T
p
i
-2.5
100
2.5
100
35
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