Grundfos CIU 501 Instructions

English (GB)
27
10.2 Setpoint
The setpoint is written to register 00104 and the actual setpoint
can be read from register 00308. Register 00104 setpoint accepts
values ranging from 0 to 10000 (0 % to 100 %). This is illustrated
in fig. 21. The setpoint is a percentage of the maximum setpoint
or sensor maximum (max. = 100 %). The setpoint value can
represent speed, pressure, flow, etc., depending on the selected
control mode.
A setpoint of 0 does not imply a stop.
Fig. 21 Setpoint
10.2.1 Setpoint examples
Closed loop
If the control mode is set to constant pressure (closed loop), and
the pressure sensor is in the range of 0 to 10 bar, a setpoint of
80 % will result in an effective setpoint of 8 bar.
If the sensor range was 0-16 bar, a 50 % setpoint would be 8 bar,
a 25 % setpoint would be 4 bar, and so on.
Fig. 22 Constant pressure
Open loop
If the control mode is set to constant frequency (open loop), the
setpoint is interpreted as setpoint for the system performance.
The example shows that a 50 % setpoint equals a 50 % system
performance.
Fig. 23 Constant frequency
TM04 2373 2508TM04 2371 2508TM04 2372 2508
Sensor
maximum
Minimum
setpoint
Effective setpoint
0 = 0 % 10000 = 100 %Setpoint [%]
10 bar
8 bar
0 = 0 % 10000 = 100 %8000 = 80 %
Maximum
system
performance
50 % system
performance
0 = 0 % 10000 = 100 %5000 = 50 %

Grundfos CIU 501 Specifications

General

Brand	Grundfos
Model	CIU 501
Category	Controller
Language	English