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Chapter 7
| Pre-installation Hardware
Configuration
These steps only need to be followed if one or both of the 4-20 mA
inputs (ANA1/ANA2 sensor inputs) is used.
This procedure must be performed by qualified, licensed
personnel. Since transmitters are factory configured, there is no
need to adjust these settings unless the configuration changes.
Since solder joints need to be created, this procedure must be
performed in a workshop with a non-explosive atmosphere.
The OLCT 80 must be disconnected from power during the
soldering procedure.
Purpose
This procedure is used to configure the connections on the printed circuit board
for 2 auxiliary inputs (In1 and/or In2) depending on the type of sensor to be
connected (4-20 mA with 2, 3 or 4 wires).
Access the internal printed circuit board
Remove the display circuit board as follows:
■
Open the housing in a non-hazardous zone.
■
Remove the 4 screws used to secure the display circuit board. Remove the
circuit board. The flat connection cable and the lower printed circuit board
can remain in place.
■
The lower printed circuit board is now accessible.
Locate the solder pads
There are 3 solder pads (Figure 35) for each auxiliary input:
■
In 1 input: pads PPS1, PPS2 and PPS7 (A and B in the figure).
■
In 2 input: pads PPS3, PPS4 and PPS8 (A and B in the figure).
7 – Pre-installation Hardware Configuration
73
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