VEGA VEGADIS 371 Ex - Manual (Page 11)

VEGADIS 371 Ex 11
4.2 Adjustment
Stage 1
When switching on the voltage supply, the LED of the
relays shortterm light and the display indicates for
approx. 4 seconds the software version of VEGADIS
371.
The figures in brackets relate to the figure under 4.1
Indicating and adjustment elements.
Course
• Choose the requested mode with the rotating switch
(7).
• Push one of the two keys (3 or 4). The digital
indication (8) begins to flash.
• Push one of the two keys to change the value of the
digital indication appropriately. When the rotating
switch (7) is set to "OPERATE“, the keys (3 and 4)
are without function.
• You can save the adjusted value by changing the
position of the rotating switch (7).
Example
- an upright cylindrical (linear) tank with a content of
2700 l.
- the max. volume is 2650 l, the min. volume 50 l.
- the level sensor in the vessel is a pressure
transmitter (passive), providing a standardized
4 … 20 mA-signal.
- for further processing you need an additional
4 … 20 mA-output signal.
- the full and empty adjustment had been carried out
correctly. The sensor delivers the following values:
Max. volume (display max.)
20 mA = 2650 l
Min. volume (display min.)
4 mA = 50 l
- relay 1 should switch on an emptying pump at a
volume of 90 % and switch off the pump at a volume
of 10 %.
First choose the parameters of your application:
Slide switch
• loosen the cover on the rear of VEGADIS 371 with a
screwdriver. Under this cover there is a slide switch
(1) by which you can adjust the kind of input:
I
active
= active current input (I
a
)
I
passive
= passive current input (I
p
)
U = voltage measurement (U)
For the given example choose I
a
(active current
input).
Current output
• Set the rotating switch (7) to position A. With the
keys (3 and 4) you can choose between measured
value output 4 … 20 mA or 0 … 20 mA.
For the given example choose 4 - 20.
The display indications have the following meaning:
0 - 20 = 0 … 20 mA; 4 - 20 = 4 … 20 mA
VEGADIS 371 requires for the scaling of the indication
the adjustment of the volumes for 4 mA and 20 mA.
The vessel must not be filled or emptied. Proceed as
follows to adjust the two values:
Decimal point
VEGADIS 371 requires for this example the
adjustment of the values for 4 mA and 20 mA (0 % and
100 %). As the range of the example tank is from 50 l
to 2650 l, you require all four positions of the digital
indication.
• Set the rotating switch (7) to position D (Decimal
Point).
• By pushing the keys (3 and 4) you move the
decimal point.
Scaled indication at 0 %
• Set the rotating switch (7) to position B (Display
min.).
• Push the plus key (3) to increase the indicating
value or the min. key (4) to reduce the indicating
value (0,1 %-steps).
• When you keep the key pushed, the digital
indication (8) changes the indicating value quicker.
For the given example adjust the digital indication
(8) to the value 50.
Scaled indication at 100 %
• Set the rotating switch (7) to position C (Display
max.).
• Push the plus key (3) to increase the indicating
value or the minus key (4) to reduce the indicating
value (0,1 %-steps).
• For the given example set the digital indication (8) to
the value 2650.
Relay
• Set the rotating switch (7) to position 1 (relay 1 on).
When the selected relay is not mounted, four
dashes appear on the digital indication. With the
keys (3 and 4) you can modify the value of the
indication. For the given example set the digital
indication (8) to the value 90,0 (90,0 %). Hence the
internal relay 1 switches on when this value is
reached.
Set-up