Controller (Controller Settings) - Grundfos TPE 2 Series Installation And Operating Instructions Manual

14.15 Controller (Controller settings)

Pump variant
TPE3, TPE3 D
TPE2, TPE2 D
The pumps have a factory default setting of gain (K
time (T ).
i
However, if the factory setting is not the optimum setting, you can
change the gain and the integral time:
• Set the gain (K ) within the range from 0.1 to 20.
p
• Set the integral-action time (T
3600 s.
If you select 3600 s, the controller will function as a P
controller.
Furthermore, you can set the controller to inverse control.
This means that if the setpoint is increased, the speed will be
reduced. In the case of inverse control, set the gain (K
the range from -0.1 to -20.
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 [m] between pump and sensor.
Temperature control
Heating
system
0.5
t
L2
L2
0.5
t
1)
In heating systems, an increase in pump performance will
result in a rise in temperature at the sensor.
2)
In cooling systems, an increase in pump performance will
result in a drop in temperature at the sensor.
L2: Distance [m] between heat exchanger and sensor.
38
Controller
(Controller settings)
●
●
) and integral
p
) within the range from 0.1 to
i
) within
p
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
Differential-temperature
control
t
L2
t
t
t
L2
L2: Distance [m] between heat exchanger and sensor.
Flow control
Q
Constant-pressure control
p
p
Level control
L
L
General rules of thumb
If the controller is too slow-reacting, increase K
If the controller is hunting or unstable, dampen the system by
reducing K or increasing T .
p i
Factory setting
See section
31. Factory settings.
K T
p i
-0.5 10 + 5L2
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
.
p