Operating Range - Grundfos CRE Notice D'installation Et De Fonctionnement

L2: distance in meters between heat exchanger and sensor.
Constant differential
temperature
t
L2
t
t
t
L2
L2: Distance [m] between heat exchanger and sensor.
Constant flow rate
Q
Constant pressure
p
p
Constant level
L
L
General 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 10. Technical data.
44
K T
p i
-0.5 10 + 5L2
K T
p i
0.5 0.5
K T
p i
0.5 0.5
0.5 0.5
K T
p i
-20 0
20 0

7.12 "Operating range"

Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE,
MTRE
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 maximum speeds
is the operating range. See fig. 58.
100 %
Fixed maximum speed
67 % User-set maximum speed

Operating range

24 %
User-set minimum speed
13 % Fixed minimum speed
0 %
Fig. 58 Example of minimum and maximum settings
Factory setting
See section 10. Technical data.
"Operating range"
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