Burkert Type 8630 - Manual (Page 60)

58 - 8630
O
PERATION AND CONTROLLER FUNCTIONS
TUNE-PWM - Readjust minimum PWM pulse-duty factor for driving the solenoid integrated in
the TOP Control Continuous
The AUTOTUNE function determines automatically the minimum PWM pulse-duty factor necessary for
driving the solenoid integrated in the TOP Control Continuous. If the frictional characteristics of the
positioning mechanism are unfavourable, these values may deviate from the optimum. By using
TUNE-
PWM, however, they can be readjusted to obtain the lowest possible speed in both directions.
TUNE-AIR - Adapt the opening to the closing time of the process valve
With spring-closing process valves, the opening speed may be varied within certain limits by changing
the supply pressure. The closing speed, however, is independent of the supply pressure and given by
the spring force and the nominal diameter of the venting valve. By using
TUNE-AIR, the opening time
may be adapted to the closing time. This results in symmetrical motion, which has a favourable effect on
the process control.
NOTE The function TUNE-PWM must be executed after AUTOTUNE!
NOTE The function TUNE-AIR must be executed after AUTOTUNE!
ATTENTION!
Avoid faulty adaptation of the controller by executing X.TUNE in all cases at the supply
pressure (pneumatic auxiliary energy) that will exist in later operation.
The function X.TUNE should preferably be executed without operating medium
pressure to avoid disturbing influences from flow forces.
END - Quitting the main menu and display of the software version
➔ ➔ ➔ ➔ ➔ To quit the main menu, select the item END with the arrow keys. To the right of the display the
software version is shown (END XX).If the MANUAL/AUTOMATIC key is pressed, EEPROM appears on
the display until the changes have been saved. After that, the device returns to the mode in which it
was before switching over to the main menu (MANUAL or AUTOMATIC).