Grundfos NBE Series - 7.5.5 Constant differential temperature; 7.5.6 Constant flow rate

7.5.5 Constant differential temperature
Pump variant Constant differential temperature
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with
Delta ρ sensor
●
The pump maintains a constant differential temperature in the
system and the pump performance is controlled according to this.
H
Q
△t
TM057954
Constant differential temperature
This control mode requires either two temperature sensors or one
external differential-temperature sensor. See the examples below.
The temperature sensors can either be analog sensors connected
to two of the analog inputs or two Pt100/1000 sensors connected to
the Pt100/1000 inputs, if these are available on the specific pump.
Set the sensor in the Assist menu under Assisted pump setup.
See the section on assisted pump setup.
Examples:
• Two external temperature sensors.
Constant differential-temperature control is achievable with two
temperature sensors. The pump uses the inputs from the two
sensors and calculates the differential temperature.
The sensors must have the same unit and must be set as
feedback sensors. You can set the sensors manually, sensor by
sensor, or by using the Assist menu. See the section on
assisted pump setup.
t
t
t
TM057894
• One external differential-temperature sensor.
The pump uses the input from the sensor to control the
differential temperature.
You can set the sensor manually or by using the Assist menu.
See the section on assisted pump setup.
Δt
TM057931
Controller settings
For recommended controller settings, see the section on the
controller.
7.5.6
Constant flow rate
Pump variant Constant flow rate
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with Delta ρ sensor
●
The pump maintains a constant flow in the system, independently of
the head.
H
Q
Q
set
TM057955
Constant flow rate
This control mode requires an external flow sensor. See the
example below.
Example:
• One external flow sensor.
Q
TM057895
Constant flow rate
Controller settings
For recommended controller settings, see the section on the
controller.
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