Burkert 8793 - Page 83

83
Start-Up
25.2.2.1. Effects and dependencies of the settings of PV-INPUT on
PV-SCALE
The settings in the PV-SCALE menu have different effects, depending on the signal type selected in
PV-INPUT.
Even the selection options for the units of the process actual value (in PVmin) depend on the signal
type selected in PV-INPUT.
See following "Table 40"
Settings in the
submenu of
PV-SCALE
Description of the effect Dependency on the signal type selected in
PV-INPUT
4 - 20 mA PT 100 Frequency
PVmin
Selectable unit of the process
actual value for the physical
variables.
Flow rate, temperature,
pressure, length, volume.
(as well as ratio as % and
no unit)
Temperature Flow-rate
Adjustment range:
0 ... 9999
(Temperature -200 ... 800)
-200 ... 800 0 ... 9999
PVmin
PVmax
Specification of the reference range
for the dead band of the process
controller
(P.CONTROL → PID.PARAMETER
→ DBND).
Yes Yes Yes
Specification of the reference range
for the analog feedback (option).
See Chapter "26.2.14. OUTPUT –
Configuring the outputs (option)".
Yes Yes Yes
Sensor calibration:
Yes
see "Figure 37"
No No
K factor
Sensor calibration: No No
Yes
see
"Figure 38"
Adjustment range: – – 0 ... 9999
Table 40: Effects of the settings in PV-SCALE depending on the signal type selected in PV-INPUT
Example of a sensor calibration for signal type 4 - 20 mA:
Scaling value
[l/min]
Input
signal [mA]
Process set-point
value
Process actual value
4
0
10
20
PVmin
SPmin
PVmax
SPmax
Scaling:
Process actual value from the transmitter:
4 ... 20 mA corresponds to 0 ... 10 l/min
Process set-point value from PLC:
4 ... 20 mA corresponds to 0 ... 8 l/min
Figure 37: Example of a sensor calibration for signal type 4 - 20 mA
english
Type 8792, 8793