Setting Up The Primary Value (Pv); Selecting The Value; Selecting The Primary Value Unit; Unlinking The Primary Value From The Empty/Full Values - ABB LWT300 series User Manual

Setting up the primary value (PV)

The primary value is the value that you want to measure with your LWT instrument. It is configured from
the PV Setup menu under the Device Setup menu.
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Figure 29 The Device Setup menu

Selecting the value

The primary value is the only value directly linked to the 4 – 20 mA current loop. It impacts other
parameters used by the instrument. The default primary value is Level.
To select the primary value:
1 Select Device Setup > PV Setup > Set PV (4-20mA).
2 Press Edit.
3 Highlight the primary value that you want to measure and press OK.

Selecting the primary value unit

Once you have selected the primary value, you need to select the unit in which this value will be
measured. The default primary value unit is m (meters).
To set the primary value unit:
1 Select Device Setup > PV Setup > PV Unit.
2 Press Edit.
3 Highlight the primary value unit that you want to use and press OK.

Unlinking the primary value from the empty/full values

By definition, the 4 mA value is assigned to the empty level and the 20 mA value is assigned to the full
level (as set first in the Easy Setup menu). Once you have set the primary values and their associated
unit, you can choose to unlink the primary values from the empty/zero (4 mA) and full/span (20 mA)
values. The default value is Linked.
To unlink the primary value from the 4 – 20 mA values:
1 Select Device Setup > PV Setup > Link 4-20mA to Z/S.
2 Press Edit.
3 Highlight Unlinked and press OK.
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Configuring the instrument