TELEDYNE OLDHAM SIMTRONICS OLCT 80 d, User Manual

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OLCT 80
GAS TRANSMITTER
USER MANUAL
NPO80GB
Revision F.1
69
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.
7.1 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).
7.2 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.
7.3 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).