Setup Steps - VEGA VEGAMET 381 Betriebsanleitung

[+/-] key:
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Change value of the parameters
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By pushing the [+/-] key, you change the individual
parameters of the selected function. In this phase,
the processed parameter is flashing. By briefly
pushing the two keys simultaneously, you save
your settings. "Save" is briefly displayed.

6.2 Setup steps

Setup
Setup comprises mainly the adjustment
of the measurement loop. A scaling of the
measured value for the LC display and the
adaptation of the relay switching points are further
settings. Additional setup steps would be, if
necessary, setting an integration time (damping) to
steady the measured value or modifying the current
output characteristics.
To clearly denote the measuring unit, the supplied
labels can be inserted in the cover. In case several
VEGAMET 381 are used, each measurement loop
should be clearly labelled.
Switch-on phase
After being switched on, VEGAMET 381 first of all
carries out a short self-check. The following steps
are carried out:
Internal check of the electronics
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Indication of the firmware version
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The output signal jumps briefly to the set fault
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value
Then the actual measured value is displayed and
the corresponding current is transmitted to the
current output.
Measured value indication
The measured value indication shows the digital
indication value and also an analogue bargraph.
Here, it is absolutely necessary that the function
switch is set to position [ 0] ("OPERATE").
Function switch
The following functions can be selected via the
rotary switch:
0: Measured value display and simulation
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1: Relay 1 switching point ON
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2: Relay 1 switching point OFF
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3: Relay 2 switching point ON
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VEGAMET 381
Setup with the integrated indicating and adjustment unit
2: Relay 2 switching point OFF
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5: Decimal point position of the scaling
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6: Scaling for 100 %
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7: Scaling for 0 %
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8: Switch over current output 0/4 ... 20 mA
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9: Damping of the measured value (integration
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time)
A: Offset correction
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B: Min. adjustment in percent through change
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of the level
C: Max. adjustment in percent through change
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of the level
D: Min. adjustment in mA without changing the
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level
E: Max. adjustment in mA without changing the
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level
F: Changeover current input active/passive
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Current input active/passive
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In active mode, VEGAMET 381 provides the
power for the connected sensor. Power supply
and measurement data are transmitted over
the same two-wire cable. This mode is
provided for connection of measuring trans-
ducers without separate operating voltage
(sensor in two-wire version).
In passive mode, the sensors are not powered,
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only the measurement value is transmitted.
This mode is provided for connection of
transmitters with their own separate operating
voltage (sensors in four-wire version).
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Set the function switch to position [F] and
select the suitable mode with the [+/-] keys.
Save your settings by pushing both keys
simultaneously.
Offset correction
When a pressure transmitter is used, an offset
correction should be carried out first. These
instruments are factory-set in a certain position. If
the pressure transmitter is now mounted in a
different position, its measuring range is shifted
slightly. The zero point is readjusted by carrying out
the offset correction in uncovered (unpressurised)
condition. The complete measuring range will be
shifted by the deviating amount.
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Make sure that the pressure transmitter is
completely unpressurised, uncovered (unim-
mersed) and mounted in its final position.
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