VEGA VEGADIS 371 Ex - Manual (Page 13)

VEGADIS 371 Ex 13
Set-up
Stage 2
Activation of the pump changeover function
It is the task of a pump changeover function, in case of
several pumps with the same function, to switch on the
pump with the shortest working time and to switch off
the pump with the longest working time.
This avoids overstress of the pumps and the lifetime of
the pumps is increased considerably. This increases
the reliability of the complete system and avoids
failures.
This means that all relays where a pump changeover
function is activated, are no more fixed coordinated to
a certain switch point but are switched on or off
dependent on the working time. VEGADIS 371 Ex
selects for switch on the relay with the shortest
working time and for switch off the relay with the
longest working time.
Example (see fig. 4.3)
Two emptying pumps should empty a vessel when a
certain level is reached. The first pump should switch
on at 80 % filling.
When the level increases, a second pump should be
switched on at 90 %.
Both pumps should be switched off again at 10 %
filling.
€ Enter the values of the concerned relays in stage 1
as follows:
1
Relay 1 on = 80,0
2 Relay 1 off = 10,0
3 Relay 2 on = 90,0
4 Relay 2 off = 10,0
€ Set the rotating switch to position 0
(Operate).
€ Change to the menu stage 2, where you push the
plus and the minus key together for approx. 3
seconds. The "VEGA“-logo flashes on the display.
€ Set the rotating switch to position 1 (pump
changeover function relay 1)
€ Set the indication with one of the two keys to "on“.
€ Set the rotating switch to position 3 (pump
changeover function relay 2)
€ Set the indication with one of the two keys to "on“.
€ Set the rotating switch to position 0
(Operate) and push the plus and minus key together
for approx. 3 seconds. The "VEGA“-logo no more
flashes. The pump changeover function is now
90%
80%
0%
On2
On1
Off1
Off2
Füllhöhe
On
Off
On
Off
t [h]
10 30 20 20 5 15
Fig. 4.3
Relay 1
Relay 2
Level