English (GB)
41
General 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 24. Factory settings.
13.13 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.
Fig. 44 Example of minimum and maximum
settings
Factory setting
See section 24. Factory settings.
13.14 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 (FM 300) is fitted, via one of the
Pt100/1000 inputs.
Example with constant pressure with linear
influence
Actual setpoint: actual input signal x (setpoint -
sensor min.) + sensor min.
At a sensor min. 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. See fig. 45.
Fig. 45 Example of setpoint influence with
sensor feed back
Constant level K
p
T
i
-20 0
20 0
Pump variant Operating range
CME ●
CRE, CRIE, CRNE,
SPKE, MTRE
●
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
CME ●
CRE, CRIE, CRNE,
SPKE, MTRE
●
Before you can enable the function, you
must set one of the analog inputs or
Pt100/1000 inputs to External setpoint
function.
See sections 13.6 Analog inputs and
13.7 Pt100/1000 inputs.
TM06 4165 1615
0
3.5 V0.5
5 V0
10 V0
20 mA0
20 mA4
Actual
input
signal
(60 %)
External
setpoint
signal
Setpoint
Sensor
max.
Sensor
min.
Actual
setpoint
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