Controller" ("Controller Settings") - Grundfos CRE Instrucciones De Instalación Y Operación

The reading is a percentage of the range between 0 and 200 % of
the maximum permissible load at the actual speed.
"Motor current"
•
Signal range
[V, mA]
0
"0-10 V" 0 V
"0-20 mA" 0 mA
"4-20 mA" 4 mA
The reading is a percentage of the range between 0 % and 200 %
of the rated current.
"Limit 1 exceeded" and "Limit 2 exceeded"
•
"Limit-exceeded function"
Signal range
[V, mA]
Output not active
"0-10 V" 0 V
"0-20 mA" 0 mA
"4-20 mA" 4 mA
This function is typically used for monitoring of secondary
parameters in the system. If the limit is exceeded, an output, a
warning or an alarm is activated.
"Flow rate"
•
Signal range
[V, mA]
0
"0-10 V" 0 V
"0-20 mA" 0 mA
"4-20 mA" 4 mA
The reading is a percentage of the range between 0 and 200 % of
the nominal flow.
Factory setting
See section 10. Technical data.
"Motor current"
[%]
100 200
5 V 10 V
10 mA 20 mA
12 mA 20 mA
Output active
10 V
20 mA
20 mA
"Flow rate"
[%]
100 200
5 V 10 V
10 mA 20 mA
12 mA 20 mA

7.11 "Controller" ("Controller settings")

Pump variant
CME
CRE, CRIE, CRNE, CRKE,
SPKE, MTRE
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 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:
Constant differential
pressure
p
p
p p
L1
L1
L1: distance in meters between pump and sensor.
Constant
Heating
temperature
system
0.5
t
L2
L2
0.5
t
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.
"Controller"
("Controller settings")
●
●
) and integral
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
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