Grundfos TPE Series - Operating Range; External Setpoint Function

English (GB)
40
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
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.
Fig. 44 Example of minimum and maximum
settings
Factory setting
See section 30. Factory settings.
13.16 External setpoint function
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.
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.
Fig. 45 Example of setpoint influence with
sensor feedback
Pump variant Operating range
TPE, TPED, NBE, NBGE,
NKE, NKGE
●
TPE, TPED, NBE, NKE
Series 2000
●
TM00 6785 5095
Fixed maximum speed
User-set maximum speed
"Operating range"
User-set minimum speed
Fixed minimum speed
24 %
13 %
0 %
67 %
100 %
Pump variant
External setpoint
function
TPE, TPED, NBE,
NBGE, NKE, NKGE
●
TPE, TPED, NBE, NKE
Series 2000
●
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 and
13.9 Pt100/1000 inputs.
TM06 4165 1615
100
0
100 %
0
1.2
2
[bar]
0
3.5 V0.5
5 V0
10 V0
20 mA0
20 mA4
-50 204 C
Actual input
signal, 60 %
External
setpoint
signal
Setpoint
Sensor max.
Sensor min.
Actual
setpoint