SMAR FI303, Руководство по эксплуатации, техническому обслуживанию и инструкциям

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FI303 - Operation and Maintenance Instruction Manual
3.12
Using Feedback page, the user can monitore and check all values related between the analog block
and the transducer block:
Figure 3.10 - FI303 Simatic PDM - OnLine Configuration feedback for AO.
Current Trim
The
FI303
provides the capability of making a trim in the output 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
output and compare it with the device’s indication (of course an appropriate meter should 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 two ways of doing the trim: using local adjustment or using
a Configuration Tool (For
example, Simatic PDM from Siemens). When doing the trim, make sure you are using an
appropriate meter (with the necessary accuracy).
Information about
the real condition
of transducer and
analog output
block.
Check back
and alarm
condition.