Burkert Type 8693 - Manual (Page 137)

137
Start-up and operation of the
position controller Type 8693
+
←
PVmin 0.0
PVmin 0.0 bar
INPUT
OK
41)
Settings:
1. Specify the unit for the process actual
value
(bar, mbar, psi, %, mm, litre, l/s, l/min, l/h,
m³/min, m³/h, UG/s, UG/min, UG/h, IG/s,
IG/min, IG/h, °C, °F,
without unit)
2. Position the decimal point
3. Set the lower scaling value for the
process actual value; the value is assigned
to 4 mA
42)
PV SCALE
ENTER
EXIT
+
←
PVmax 100.0
PVmax 100.0 bar
INPUT
OK
41)
Set the upper scaling value for the
process actual value; the value is assigned
to 20 mA
42)
Figure 85: Operating structure P.CONTROL - PV-SCALE - 4-20mA
Scaling.example.of.the.4.–.20.mA.input
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
Scaling value
[l/min]
Input
signal [mA]
Process
set-point
value
Process actual value
4
0
10
20
Example of inputting scaling values
Variant 1 Variant 2 Variant 3
PVmin 0 0 0
PVmax 1.0 10.0 100.0
SPmin 0 0 0
SPmax 0.8 8.0 80.0
Figure 86: Scaling example
For SP INPUT internal (set-point value default via the arrow keys) the scaling of the set-point value via SPmin
and SPmax is not possible. The set-point value can be input directly according to the scaled process variable
(PVmin, PVmax ).
41)
If the sub-menu is left by pressing the selection key on the left (ESC), the value remains unchanged.
42)
This setting specifies the reference range for the dead band of the process controller as well as for the
analogue feedback of the process actual value (option).
english
Type 8692, 8693