VEGA VEGASON 71 - 2 … 75 - 2 - Manual (Page 33)

Measurement, Relay output
71 - 2 … 75 - 2 33
Using the VEGASON-measuring system in pump
stations allows several pumps to be used indepen-
dent of the level. Due to the different switching
commands there could be unequal pump running
times (and wear). With programming the mode "pump function" the
switch on period of the respective relay outputs is
monitored via the central electronics. An automatic
change-over (priority determination) ensures
equality of pump running periods. See the following
example with three pumps.
Priority determination by:
-
switching on the measuring system
- all relay outputs concerned in the pump function
switched off, i.e. with all pumps
- with time interval, the time interval is active if
within the time programmed in mode 63 all
pumps are not stopped.
In this case first all relay outputs are switched
off, the actual priority will be determined and the
pumps will be switched on again in new
sequence after 10 secs.
Factory preset of mode 0 - 63 with 9999 minutes
^ approx. 1 week to the max interval time.
Note:
Before changing this time, it should be checked
if the (10 secs.) switch off of all pumps will create
a problem.
P3 on
% m
100
80
60
40
20
0
P2 on
P1 on
P3 off
P2 off
P1 off
P1 on
P2 on
P3 on
P1 off
P2 off
P3 off
P3
P2
P1
2h
4h
6h
6h
4h
2h
h
distance acc. to sensor type
running periods
= 8 h
= 8 h
= 8 h
Two-point level switch with pump function switch