Operating Range; External Setpoint Function - Grundfos TPE Series Installation And Operating Instructions Manual

Rules of thumb
If the controller is too slow-reacting, increase the
gain.
If the controller is hunting or unstable, dampen the
system by reducing the gain or increasing the
integral time.
Factory setting
See section 30. Factory settings.

13.15 Operating range

Pump variant
TPE, TPED, NBE, NBGE,
NKE, NKGE
TPE, TPED, NBE, NKE
Series 2000
Set the operating range as follows:
• Set the minimum speed within the range from
fixed minimum speed to user-set maximum
speed.
• Set the maximum speed within the range from
user-set minimum speed to fixed maximum
speed.
The range between the user-set minimum and
maximum speeds is the operating range. See fig. 44.
Speeds below 25 % may result in noise from the
shaft seal.
100 %
67 %
24 %
13 %
0 %
Fig. 44 Example of minimum and maximum
settings
Factory setting
See section 30. Factory settings.
40
Operating range
●
●
Fixed maximum speed
User-set maximum speed
"Operating range"
User-set minimum speed
Fixed minimum speed

13.16 External setpoint function

Pump variant
TPE, TPED, NBE,
NBGE, NKE, NKGE
TPE, TPED, NBE, NKE
Series 2000
You can influence the setpoint by an external signal,
either via one of the analog inputs or, if an advanced
functional module is fitted, via one of the Pt100/1000
inputs.
Before you can enable the External
setpoint function, you must set one of the
analog inputs or Pt100/1000 inputs to
Setpoint influence.
See sections 13.7 Analog inputs
13.9 Pt100/1000
If more than one input has been set to Setpoint
influence, the function selects the analog input with
the lowest number, for example Setting of pump, and
ignores the other inputs, for example Analog input 3
or "Pt100/1000 input 1".
Example with constant pressure with linear
influence
Actual setpoint: actual input signal x (setpoint -
sensor min.) + sensor min.
At a lower sensor value of 0 bar, a setpoint of 2 bar
and an external setpoint of 60 %, the actual setpoint
is 0.60 x (2 - 0) + 0 = 1.2 bar.
[bar]
Sensor max.
Setpoint
2 100
Actual
1.2
setpoint
Sensor min.
0 0
0
0.5
0
0
0
4
-50
Fig. 45 Example of setpoint influence with
sensor feedback
External setpoint
function
●
●
and
inputs.
External
Actual input
100 %
setpoint
signal, 60 %
3.5 V
5 V signal
10 V
20 mA
20 mA
204 C