Burkert Type 8630 - Manual (Page 112)

110 - 8630
O
PERATING THE PROCESS CONTROLLER
P.CO LEAK Leakage characteristic for flow rate control (Flow
rate control option)
The program function P.CO LEAK enables air leakage compensation, which increases the accuracy of the
flow rate control.
Background: during transport of pourable solids, there arises at a cellular wheel sliuce an air leakage
dependent on the pressure. The air flow through the controller unit is the sum of this leakage and the air
flow of the conveying pipe.
QFMR = Q
air leak
+ Q
conv. pipe
To achieve an air leakage compensation, an air leakage characteristic must be read-in once with the
conveying pipe closed.
Reading-in of the leakage characteristic
Boundary conditions
For exact measurement of the leakage, the system should be started up in the normal mode.
However, the following exceptions apply:
•
The conveying pipe must be closed off behind the components causing the leak.
•
The material to be transported is omitted.
ATTENTION!
•
In the case of pneumatic conveying of pourable solids with a rotary valve, the
following must be observed:
•
The conveying pipe must be closed off behind the rotary valve.
•
The rotary valve must be empty and run at the nominal rpm..
•
Measures for sealing the system (e. g. blocking air that enters from above into the
rotary valve) must be connected.
•
The compressor must be switched on.
Measurement and reading-in of the leakage characteristic
Select program to initiate automatic recording of leakage characteristic using
P.CONTRL P.CO LEAK P.CO MEAS menu
Press and hold the button for 5 seconds.
The leakage characteristic is now automatically captured and read-in.
NOTE Press both buttons simultaneously to interrupt the determination of the characteristic
and select LEAK BRK.
Display Description
TUNE 5
TUNE 4
Countdown from 5 to 0 to the start of leakage determination
:
TUNE 0
LEAK IN
Display of the momentarily running phase of leakage determination
LEAK PO (progress is indicated by a rotating beam at the left hand edge of the display)
LEAK OPN
LEAK PAR
LEAK END
Display flashes. Leakage determination successfully completed
L.ERR X Display on occurrence of an error (display on the right: error number, see
chapter Maintenance and Troubleshooting in the controller manual)