Grundfos TPE2 - Page 61

This means that if the setpoint is increased, the
speed is reduced. In the case of inverse control, set
the gain within the range from -0.1 to -20.
Guidelines for setting of PI controller
The tables below show the recommended controller
settings:
Differential-pressure
control
K
p
T
i
p
0.5 0.5
p
p
p
Δp
L1
0.5
L1 < 5 m: 0.5
L1 > 5 m: 3
L1 > 10 m: 5
L1
Δp
L1: distance in metres between pump and sensor.
Temperature
control
K
p
T
i
Heating
system
8)
Cooling
system
9)
L2
t
0.5 -0.5 10 + 5L2
L2
t
0.5 -0.5 30 + 5L2
8)
In heating systems, an increase in pump performance
results in a rise in temperature at the sensor.
9)
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.
Differential-
temperature control
K
p
T
i
t
L2
-0.5 10 + 5L2
t
t
t
L2
L2: distance in metres between heat exchanger and
sensor.
Flow control
K
p
T
i
Q
0.5 0.5
Constant-pressure
control
K
p
T
i
p
0.5 0.5
p
0.1 0.5
Level control
K
p
T
i
L
-2.5 100
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