71
Typ EP 501
Start-Up
23.2.2.1. 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
.
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 "24.2.14. OUTPUT –
Configuring the outputs (option)".
Yes
Yes
Yes
Sensor calibration:
Yes
see "Figure 28"
No
No
K factor
Sensor calibration:
No
No
Yes
see
"Figure 29"
Adjustment range:
–
–
0 ... 9999
Table 31:
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 28:
Example of a sensor calibration for signal type 4 - 20 mA
english
