VEGA VEGAMET 381 Ex - Manual (Page 27)

27
6 Setup with the integrated display and adjustment unit
VEGAMET 381 Ex • 4 … 20 mA signal conditioning instrument
30418-01-131025
should switch on and off again. Furthermore you
have to distinguish between the relay modes
overfill and dry run protection. You switch over
by exchanging the ON/OFF values of the relay.
•
Overflow 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)
→
To adjust the on and off switching points of
relay 1, set the function switch to position
[1] or [2], enter the switching points for ON
or OFF and save your settings. If necessary,
proceed in the same way with relay 2 (posi-
tion [3] or [4]).
2
1
3
off (on)
on (off)
o n
o n
o f f
o f f
t
L E D
Abb. 17: Relay modes
1 Filling height
2 Mode overfill protection
3 Mode dry run protection
Scaling
Scaling means converting the measured value
into a certain parameter and unit. The indication
can then show the volume in litres e.g., instead
of the percentage value. Indication values from
-9999 to +9999 are possible.
1. First of all, determine the max. indicating
range and the number of decimal places
after the decimal point -- max. four decimal
places can be displayed. Select position [
5 ] of the function switch, place the decimal
point in the required position and save your
settings.
2. Now select position [6] or [7] on the function
switch, enter the requested values for
100 % or 0 % and save your settings.
Damping
To suppress fluctuations in the measured value
display, e.g. caused by an agitated product sur-
face, an integration time can be set. This time
can be between 0 and 250 seconds. Remember
that the reaction time of the entire measurement
will then be longer and the sensor will react
to measured value changes with a delay. In
general, a period of a few seconds is sufficient
to smooth the measured value display.
→
Now select position [9] on the function
switch, enter the requested value and save
your settings
Current output 0/4 … 20 mA
The characteristics of the current output can be
switched over from 4 … 20 mA to 0 … 20 mA.
→
Now select position [8] on the function
switch, adjust the requested characteristics
curve and save your settings
Simulation
To check if the settings ofVEGAMET 381 Ex are
correct, the simulation mode can be used. Any
individual measured value can be simulated
and e.g. the correct behaviour of the relays and
the connected instruments can be checked.
Switching over between the functions "OPERA-
TE" and "Simulation" is done by pushing the [+/-
] keys for at least 3 seconds. In the simulation
mode, the set value flashes on the display. The
simulation can be switched off by pushing both
keys again for approx. 3 seconds. If no key is
pushed, the display switches automatically over
to "OPERATE" after approx. 60 minutes and the
simulation is terminated.
→
To start simulation, push the [ +/-] keys si-
multaneously until the displayed value starts
flashing (approx. 3 seconds). By pushing
either of the [ +/-] keys, you can set the
requested simulation value and carry out
your check.