Grundfos TPE3 - Operating Range

English (US)
34
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 ft (m) between heat exchanger and sensor.
L2 = Distance ft (m) between heat exchanger and sensor.
General rules of thumb
If the controller is too slow-reacting, increase K
p
.
If the controller is hunting or unstable, dampen the system by
reducing K
p
or increasing T
i
.
15.14 Operating range
Set the operating range as follows:
• Set the minimum speed within the range from fixed minimum
speed to user-set maximum speed.
• Set the maximum speed within the range from user-set
minimum speed to fixed maximum speed.
The range between the user-set minimum and maxumum speeds
is the operating range. See fig. 54.
Fig. 54 Example of min. and max. settings
Temperature control
K
p
T
i
Heating
system
1)
Cooling
system
2)
0.5 -0.5 10 + 5L2
0.5 -0.5 30 + 5L2
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
L2
t
L2
t
t
L2
t
t
t
L2
Q
p
p
Level control K
p
T
i
-2.5 100
2.5 100
Pump variant Operating range
TPE3 (D) ●
TPE2 (D) ●
Note
Note
Speeds below 25 % may result in noise from the
shaft seal.
TM00 6785 5095
L
L
Max. speed (fixed)
User-set max. speed
Operating range
User-set min. speed
Min. speed (fixed)
24 %
12 %
0 %
67 %
100 %