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3.2.11 Control Function
Operation with PFU 2000 RAM / PMU 2000 Settings:
The "control function" (display 214) determines how the system is
to react to any difference between the actual value and the set-
point set.
The following control functions are possible:
•
"normal"
If the actual value is lower that the setpoint, the pump perform-
ance will be increased (the controller amplifies the output sig-
nal).
•
"invers"
If the actual value is lower than the setpoint, the pump per-
formance will be reduced (the controller diminishes the output
signal).
Dependent on the control parameter selected, the required con-
trol function is as follows:
"Normal" is required for the control parameters "pressure", "differ-
ential pressure", "flow" and "level" (filling).
"Invers" is required for the control parameters "differential tem-
perature" and "level" (draining).
3.2.12 PFU 2000 Analog Input 1 Configuration
The PFU 2000 analog input 1 value is the measured value in the
system. The PFU 2000 receives a signal from the signal transmit-
ter installed. The evaluation of the input signal depends on the
setting of the control parameter, the transmitter measuring range
and the measuring unit of the actual value.
In the wiring diagram and the PFU 2000 EPROM default settings,
a 4-20 mA pressure measuring signal has been applied.
The necessary hardware configuration is described in section
6.2.1 PFU 2000 DIP Switch Settings.
3.2.13 PFU 2000 Analog Input 2 Configuration
The PFU 2000 analog/digital input 2 is only used for pre-pressure
measuring (only for control parameter "pressure with pre-pres-
sure measuring").
A digital signal (potential-free contact NC or NO) or the following
analog signals can be connected and evaluated: 0-10 V, 0-20 mA
or 4-20 mA.
The necessary hardware configuration is described in section
6.2.1 PFU 2000 DIP Switch Settings.
3.2.14 PFU 2000 Analog Input 3 Configuration
The PFU 2000 analog input 3 receives a setpoint influence signal
in accordance with the setting in "setp. influence" (display 202).
The necessary hardware configuration is described in section
6.2.1 PFU 2000 DIP Switch Settings.
The default function of the PFU 2000 analog input 3 without a
PMU 2000 is "extern" in % (linearly from 0% to 100%).
For further information, see section
3.2.5 Setpoint Influences.
17
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