Burkert Type 8611 - Manual (Page 52)

52
FunctionsoftheConfigurationLevel
Setting the PWM frequency in the menu:
Selection of
control variable
Continue with
selection of process
value input
see Figure 27
Manual entry of
PWM frequency*
)
* ) Value range for PWM frequency:
min. 150 Hz, max. 9999 Hz.
0000
.. .. .. ..
0725
2821
0000
FREE
MODE
setting the pWM frequency
0001
CODE
SCV
FREE
BACK
.
.
.
.
PWM frequency
Bürkert Type
Figure 32: SCV; Setting the PWM frequency for controlling proportional valves
Schematic representation:
Controller setting:
MODE = P, SCV, NORM
4 - 20 mA
P
8611
Controller
Set-point value
PWM
Figure 33: Pressure control using proportional valve
12.3.3. PCV - Quasi-continuous control using process valve
use: Using this function, it is possible to implement the control of a process valve without position feedback. This
is in particular interesting if the process valve cannot be designed with position feedback due to rough process
conditions (e.g. high temperature, high humidity, little space requirement).
english
Type 8611