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

7.12 "Operating range"

Pump variant
LCSE
VLSE
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. 55.
100 %
Fixed maximum speed
User-set maximum speed
67 %
Operating range
24 % User-set minimum speed
13 %
Fixed minimum speed
0 %
Fig. 55 Example of minimum and maximum settings
Factory setting
See section
10. Technical data.
42

7.13 "External setpoint function"

"Operating range"
Pump variant
●
LCSE
●
VLSE
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 minimum of 0 psi, a setpoint of 232 psi and an
external setpoint of 60 %, the actual setpoint is 0.60 x (232 - 0) +
0 = 139 psi. See fig. 56.
Before you can enable the function, you must set one
of the analog inputs or Pt100/1000 inputs to "External
setpoint function".
Analog inputs"
See sections
7.5 "
Pt100/1000 inputs"
7.6 "
Sensor
maximum
"Setpoint"
Actual
setpoint
Sensor
minimum
Fig. 56 Example of setpoint influence with sensor feed back
"External setpoint
function"
●
●
and
.
External
Actual
input setpoint
signal
signal
(60 %)