VEGA VEGAMET 391 With SIL qualification - Manual (Page 24)

24
7 Setup with the integrated display and adjustment unit
VEGAMET 391 • With SIL qualification
38704-EN-130228
•
Overfill protection: Relay is switched off when the max. level is
exceeded (safe currentless condition), relay is switched on again
when the level falls below the min. level (switch-on point < switch-
off point)
•
Dry run protection: Relay is switched off when the level falls
below the min. level (safe currentless condition), relay is switched
on again when the max. level is exceeded (switch-on point >
switch-off point)
•
Pump control: With several pumps having the same function, the
pumps will be alternately switch on and off according to the adjust-
able criteria
Additional modes such as "Switching window", "Flow" and "Tenden-
cy" can be only adjusted via PACTware and DTM.
Relay 2 can be alternatively configured as fail safe relay. The follow-
ing example shows the adjustment of an overfill protection. Further
information to pump control are available in chapter "Application
examples".
Select the requested mode and save with [OK]. By pushing [->], you
reach the next menu item.
1. Now enter the reference value to which the relay switching points
relate. By pushing [->], you reach the next menu item.
2. Now enter the switching points for switching the relay on and off.
In the following window the reaction of the relay in case of failure can
be determined. Here you can define whether, in case of failure, the
switching condition of the relay remains unchanged or the relay is
switched off.