Grundfos NBE Series - 7.5.7 Constant level; 7.5.8 Constant other value; 7.5.9 Constant curve; 7.6 Setting the proportional pressure

7.5.7 Constant level
Pump variant Constant level
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with Delta ρ sensor
●
The pump maintains a constant level, independently of the flow
rate.
H
Q
TM057941
Constant level
This control mode requires an external level sensor.
The pump can control the level in a tank in two ways (see the figure
above):
• As an emptying function where the pump draws the liquid from
the tank.
• As a filling function where the pump pumps the liquid into the
tank.
The type of level control function depends on the setting of the built-
in controller.
Example:
• One external level sensor with emptying function.
L
TM057896
• One external level sensor with filling function.
L
TM057965
Controller settings
For recommended controller settings, see the section on the
controller.
7.5.8
Constant other value
Pump variant Constant other value
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with
Delta ρ sensor
●
Use this control mode to control a value which is not available in the
Control mode menu. To measure the controlled value, connect a
sensor to one of the analog inputs. The controlled value is shown in
percentage of the sensor range.
7.5.9
Constant curve
Pump variant Constant curve
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with Delta ρ sensor
●
Use this control mode to control the motor speed.
You can set the desired speed in percentage of the maximum
speed in the range from user-set minimum speed to user-set
maximum speed.
H
Q
TM057957
7.6 Setting the proportional pressure
Pump variant Setting the proportional pressure
NBE, NKE, NBSE, VLSE -
NBE, NKE, NBSE Series
2000; VLSE with
Delta ρ sensor
●
7.6.1 Control curve function
You can set the proportional curve either to quadratic or linear to
match the system curve.
7.6.2
Zero flow head
You can set this value in percentage of the setpoint and define how
much the setpoint must be reduced at a closed valve. With a setting
of 100 %, the control mode is equal to the constant differential
pressure.
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English (US)