Grundfos NBE Series - 7.15 Operating range; 7.16 External setpoint function

7.15 Operating range
Pump variant Operating range
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with Delta ρ sensor
●
Set the operating range as follows:
1. Set the minimum speed within the range from fixed minimum
speed (5) to user-set maximum speed (2).
2. Set the maximum speed within the range from user-set
minimum speed (4) to fixed maximum speed (1).
The range between the user-set minimum and maximum speed is
the operating range (3).
1
2
3
4
5
100%
67%
24%
13%
0%
TM006785
Pos. Description
1 Fixed maximum speed
2 User-set maximum speed
3 Operating range
4 User-set minimum speed
5 Fixed minimum speed
7.16 External setpoint function
Pump variant External setpoint function
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with
Delta ρ sensor
●
Use this function to influence the setpoint by an external signal via
one of the analog inputs.
If the FM310 or FM311 functional module is fitted, you can also
influence the setpoint via one of the Pt100/1000 inputs.
To enable the function, set one of the analog inputs or
Pt100/1000 inputs to Setpoint influence with Grundfos
GO or to Ext. setpoint infl. with the HMI 300 or 301
operating panel.
Example of setpoint influence in control mode Const. pressure
Actual setpoint: actual input signal × setpoint.At a setpoint of 2 bar
and an external setpoint of 60 %, the actual setpoint is 0.60 × 2 =
1.2 bar.At a setpoint of 232 psi and an external setpoint of 60 %, the
actual setpoint is 0.60 × (232 - 0) + 0 = 139 psi.
A
B
C
D
E
F
TM080912
Example of setpoint influence with sensor feed back
Pos. Description
X: External input signal from 0 to 100 %
Y: Setpoint influence from 0 to 100 %
X1: Actual input signal, 60 %
Y1: Sensor maximum
Y2: Setpoint
Y3: Actual setpoint
Y4: Sensor minimum
Example of a constant curve with linear influence function
Actual setpoint: actual input signal × (setpoint - user-set minimum
speed) + user-set minimum speed.At a user-set minimum speed of
25 %, a setpoint of 85 % and an external setpoint of 60 %, the
actual setpoint is 0.60 × (85 - 25) + 25 = 61 %.
54
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