Grundfos TPE Series - Page 39

English (GB)
39
Guidelines for setting of PI controller
The tables below show the recommended controller
settings:
L1: distance in metres between pump and sensor.
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 metres between heat exchanger and
sensor.
L2: distance in metres between heat exchanger and
sensor.
"Differential-pressure
control"
K
p
T
i
0.5 0.5
0.5
L1 < 5 m: 0.5
L1 > 5 m: 3
L1 > 10 m: 5
"Temperature
control"
K
p
T
i
Heating
system
1)
Cooling
system
2)
0.5 -0.5 10 + 5L2
0.5 -0.5 30 + 5L2
p
p
p
p
ǻS
L1
L1
ǻS
L2
t
L2
t
"Differential-temperature
control"
K
p
T
i
-0.5 10 + 5L2
"Flow control" K
p
T
i
0.5 0.5
"Constant pressure
control"
K
p
T
i
0.5 0.5
0.1 0.5
"Level control" K
p
T
i
-2.5 100
2.5 100
t
L2
t
t
t
L2
Q
p
p
L
L