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6.3 Byte no. 3
6.4.1 Setpoint examples
Operating modes
Closed loop
This section describes the possible operating modes for the
pump connected to the CR Monitor.
If the control mode is set to CONST_PRESS (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.
6.3.1 Auto-control (0)
If the sensor range was 0 to 16 bar, a 50 % setpoint would be
8 bar, a 25 % setpoint would be 4 bar, and so on.
The pump connected to the CR Monitor is in normal operating
mode. The pump speed is controlled via the pump setpoint.
6.3.2 OpenLoopMin (4)
10 bar
The pump connected to the CR Monitor is running at minimum
speed.
8 bar
6.3.3 OpenLoopMax (6)
The pump connected to the CR Monitor is running at maximum
speed.
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6.4 Bytes nos 4 and 5
Setpoint
The setpoint accepts values ranging from 0 to 10000 (0 % to
100 %). This is illustrated in fig. 11. 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.
0=0%
8000 = 80 %
10000 = 100 %
Fig. 12 Constant pressure
Open loop
If the control mode is set to CONST_FREQ (open loop), the
setpoint is interpreted as setpoint for the system performance.
Sensor
maximum
Effective setpoint
The example shows that a 50 % setpoint equals a 50 % system
performance.
0=0%
Setpoint [%]
10000 = 100 %
50 % system
performance
Fig. 11 Setpoint
0=0%
5000 = 50 %
10000 = 100 %
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Minimum
setpoint
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Maximum
system
performance
Fig. 13 Constant frequency
11