Burkert 8692 - PV-SCALE - 1 - Scaling of the Process Controller for Signal Type 4 - 20 Ma (PV-INPUT 4 - 20 Ma)

101
Type 8692, 8693
english
Start-up, operation
process controller Type 8693
-1-
PV-SCALE - 1 - Scaling of the process controller for signal
type 4 – 20 mA (PV-INPUT 4 - 20 mA)
With the PV-SCALE function for signal type 4 – 20 mA the following settings are specified:
The unit of the process actual value.•
The position of the decimal point.•
The values for the lower and upper process actual value are assigned to the respective current value of the unit signal.•
If the settings for the unit of the process actual value or the position of the decimal point are input or changed, this
setting applies to all scaling values (PVmin, PVmax, SPmin, SPmax).
+
←
PVmin 0.0
PVmin 0.0 bar
INPUT
OK
*
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**
PV SCALE
ENTER
EXIT
+
←
PVmax 100.0
PVmax 100.0 bar
INPUT
OK
*
Set the upper scaling value
for the process actual value;
the value is assigned to
20 mA**
Fig. 10: 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
00 0
PVmax
1.0 10.0 100.0
SPmin
00 0
SPmax
0.8 8.0 80.0
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 ).
* If the sub-menu is left by pressing the selection key on the left (ESC), the value remains unchanged.
** 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).