SMAR IF302, Operation, Maintenance & Instruction Manual

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IF302 - Operation and Maintenance Instruction Manual
3.2
Primary Value Status
The status of the Primary Value can follow the NAMUR NE 43 as showed bellow:
3.80 mA < input < 20.5 mA GOOD
input = 3.80 mA or input = 20.5 UNCERTAIN
input <= 3.6 mA or input >= 21.0 mA BAD
To disable this feature, just write a number different from 4 or 20 in the Transducer xd_scale
parameter.
Current Trim
The
IF302
provides the capability of making a trim in the input channels, if necessary.
A trim is necessary if the indicator reading of the transducer block output differs from the actual
physical output. The reason may be:

The user's current meter differs from the factory standard.

The converter had its original characterization shifted by over-load or by long term drift.
The user can check the calibration of the transducer output by measuring the actual current in the
input and compare it with the device’s indication (of course an appropriate meter shall be used). If a
mismatch is detected, a trim can be done.
Trim can be done in two points:
Lower Trim
: Is used to trim the output at the lower range.
Upper Trim
: Is used to trim the output at the upper range.
These two points define the linear characteristic of the output. Trim in one point is independent from
the other.
There are at least two ways of doing the trim: using local adjustment or using
SYSCON
(the System
Configurator from
SMAR
).
When doing the trim, make sure you are using an appropriate meter (with the necessary accuracy).
Via SYSCON
The channel number of the AI block is related to the transducer’s terminal block number. Channel
number 1,2,3 corresponds bi-univocally to the terminal block with the same number. Therefore, all
the user has to do is to select combinations: (1,1), (2,2), (3,3), for (CHANNEL, TERMINAL
NUMBER).