P.co Scal - Burkert 8630 Operating Instructions Manual

P.CO SCAL

Scale limit for process control by selection of
A)
(example see below)
Scale limit selection example for the 4..20 mA input (Fig. 6.16):
Actual process value of the transmitter:
Process setpoint of the SPS:
Scale limit
[l/min]
NOTE The entry of large scale values increases the precision of the display.
The amplification (KP) of the process controller relates to scale values set.
With P.CO SETP / SETP INT (desired value pre-set via the arrow key), no scaling of the desired value über SP und
SP
Top Control Positioner
4..20 mA match 0..10 l/min
4..20 mA match 0..8 l/min
Process
value
Process
setpoint
Input signal
[mA]
not possible. It can be entered directly in correspondence with the scaled process variable (PV , PV ).
"4 ..20 mA" (P.CO inp 4-20A)
Position of the decimal point for the process setpoint and
actual value
(Selectable value: 0..3)
Lower range value for process actual value
(process value);
value assigned to 4 mA.
Higher range value for process actual value
(process value);
value assigned to 20 mA.
Lower range value for process setpoint
(setpoint); assigned to the lower current/voltage value of
the external setpoint signal.
This setting is only activated if
P.CO SETP / SETP EXT is selected.
Higher range value for process setpoint
(setpoint); assigned to the higher current/voltage value of
the external setpoint signal.
This setting is only activated if
P.CO SETP / SETP EXT is selected.
Example for scale value entries
Variant 1
PV 0
PV 1.0
SP 0
SP 0.8
Fig 6.16: Example of scale limit for controller input
Variant 2 Variant 3
0 0
10.0 100.0
0 0
8.0 80.0
111