Grundfos CME User Manual

English (GB)
40
13.12 "Controller" (Controller settings)
The pumps have a factory default setting of gain (K
p
)
and integral 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 within the range from 0.1 to 20.
• Set the integral-action time within the range from
0.1 to 3600 seconds.
If you select 3600 seconds, the controller
functions as a P controller.
Furthermore, you can set the controller to inverse
control.
This means that if you increase the setpoint, the
speed is reduced. In the case of inverse control, you
must 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:
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 [m] between heat exchanger and
sensor.
Pump variant
"Controller"
(Controller settings)
CME ●
CRE, CRIE, CRNE,
SPKE, MTRE
●
Constant differential
pressure
K
p
T
i
0.5 0.5
0.5
L1 < 5 m: 0.5
L1 > 5 m: 3
L1 > 10 m: 5
p
p
p
p
ǻS
L1
L1
ǻS
Constant
temperature
K
p
T
i
Heating
system
1)
Cooling
system
2)
0.5 -0.5 10 + 5L2
0.5 -0.5 30 + 5L2
Constant differential
temperature
K
p
T
i
-0.5 10 + 5L2
Constant flow rate K
p
T
i
0.5 0.5
Constant pressure K
p
T
i
0.5 0.5
0.5 0.5
L2
t
L2
t
t
L2
t
t
t
L2
Q
p
p

Grundfos CME Specifications

General

Liquid temperature range	0 °C to +60 °C
Maximum operating pressure	10 bar
Series	CME
Frequency	50/60 Hz
Max Pressure	10 bar
Pump Type	Centrifugal
Material	Stainless steel
Applications	pressure boosting, irrigation
Pumped liquid	Clean water
Approvals	CE
Max Liquid Temperature	60°C
Power Supply	1-phase or 3-phase