VEGA VEGAFLEX 62 Profibus PA - Manual (Page 28)

6.4 Setup steps
After VEGAFLEX 62 is connected to voltage supply or after voltage
recurrence, the instrument carries out a self-check for approx. 30
seconds. The following steps are carried out:
l Internal check of the electronics
l Indication of the instrument type, the firmware as well as the
sensor TAGs (sensor designation)
l Status byte goes briefly to fault value
Then the current measured value will be displayed and the
corresponding digital output signal will be outputted to the cable.
1)
Before starting the actual parameter adjustment of a Profibus PA
sensor, the address setting must first be carried out. You will find a
detailed description in the operating instructions manual of the
indicating and adjustment module or in the online help of PACTware or
DTM.
As VEGAFLEX 62 is a distance measuring instrument, the distance
from the sensor to the product surface is measured. To have the real
product level displayed, an allocation of the measured distance to the
percentage height must be made. To carry out this adjustment, the
distance is entered with full and empty vessel. If these values are not
known, an adjustment with the distance values, e.g. 10 % and 90 % is
also possible. Starting point for these distance specifications is always
the seal surface of the thread or flange. With these settings, the real
level is calculated. Furthermore the operating range of the sensor is
limited from maximum to the required range.
The real product level during this adjustment is not important, because
the min./max. adjustment is always carried out without changing the
product level. These settings can be made ahead of time without the
instrument having to be installed.
In the main menu item "Basic adjustment", the individual submenu
items should be selected one after the other and provided with the
correct parameter values.
Caution:
If there is a separation of different liquids in the vessel, e.g. by
condensation, VEGAFLEX 62 will always detect the medium with the
higher dielectric figure (ε
r
).
Keep in mind that interfaces can cause faulty measurements.
If you want to measure the total height of both liquids reliably, please
contact our service department or use an instrument specially
designed for interface measurement.
1) The values correspond to the actual measured level as well as to the set-
tings already carried out, e.g. default setting.
Switch on phase
Address setting
Parameter adjustment
28 VEGAFLEX 62 • Profibus PA
6 Set up with the indicating and adjustment module PLICSCOM
31839
-EN
-100426