Burkert Type 8630 - Manual (Page 113)

8630 - 111
O
PERATING THE PROCESS CONTROLLER
Program sequence
•
The control valve is closed.
•
After 10 sec settling time, the admission pressure at the controller unit (FMR) is registered.
NOTE Scaling of the x-axis of the leakage characteristic is based upon this pressure value. The
upper limit is this value times a factor of 0.85
Up to 21 reference points are determined.
Example: at an admission pressure of 2.0 bar, the characteristic curve is obtained from 0 to
1.7 bar in 85 mbar steps.
•
The control valve is slowly opened in a ramp time of 60 sec.
•
Parallel to this, the conveyance pressure (pressure at the outlet side of the FMR) is monitored.
For each reference point of the characteristic, the conveyance pressure and the air flow are registered.
•
Reading in is complete when after 60 sec the contol valve is fully open, or the conveyance pressure
previously reaches the uper limit of the scaling.
•
Air leakage compensation is now activated. The process value is now obtained from the difference
between the measured air flow and the air leak rate calculated from the characteristic:
Q
conv. pipe
= Q
FMR
- Q
air leak
* Reference points are displayed alternately as conveyance
pressure in mbar and air flow or conveyance speed in m
3 /h or
m/s respectively.
Start automatic
determination of
the leakage
characteristic
Deactivate leakage characteristic
Activate leakage characteristic
*Show the
leakage
charateristic
display.
Release
Deactivation of the characteristic curve
The leakage characteristic that has been read-in can be deactivated using the function LEAK D'ACT in the
P.CO LEAK menu.