Operating Range; Setpoint Influence - Grundfos TPE 1000 Serie Instrucciones De Instalación Y Funcionamiento

Differential-temperature
control
t
L2
t
t
t
L2
L2 = Distance ft (m) between heat exchanger and sensor.
Flow control
Q
Constant-pressure control
p
p
Level control
L
L
General rules of thumb
If the controller is too slow-reacting, increase K
If the controller is hunting or unstable, dampen the system by
reducing K or increasing T .
p i
K T
p i
10 + 5L2
-0.5
K T
p i
0.5 0.5
K T
p i
0.5 0.5
0.1 0.5
K T
p i
-2.5 100
2.5 100
.
p

11.12 Operating range

Set the operating range as follows:
• Set the min. speed within the range from fixed min. speed to
user-set max. speed.
• Set the max. speed within the range from user-set min. speed
to fixed max. speed.
The range between the user-set min. and max. speeds is the
operating range. See fig. 34.
Speeds below 25 % may result in noise from the
Note
Note
shaft seal.
100 % (110 %)
Max. speed (fixed)
67 % User-set max. speed
Operating range
24 %
User-set min. speed
12 % Min. speed (fixed)
0 %
Fig. 34 Example of min. and max. settings

11.13 Setpoint influence

11.13.1 External setpoint influence
It is possible to 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.
Digital inputs
Before the "
the analog inputs or Pt100/1000 inputs must be
External setpoint function
Note
Note
set to "
See sections 11.5
Pt100/1000 inputs
11.6
If more than one input has been set up for setpoint influence, the
function will select the analog input with the lowest number, for
example "Analog input 2", and ignore the other inputs, for
example "Analog input 3" or "Pt100/1000 input 1".
" can be enabled, one of
".
Analog inputs
and
.
23