Carlo Gavazzi WM3-96 - Manual (Page 39)

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Analogue outputs
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38 43
List of variables
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• MIN U.: 0,0%
• MAX U.: 100%
• MIN IN: C 0,000; the values entered with a negative sign
correspond to C, those entered with a positive sign corre-
spond to L;
• MAX IN: L 0,001; the values entered with a negative sign
correspond to C, those entered with a positive sign corre-
spond to L; we have chosen to limit “0,001” as minimum
value to be set for L , in order to avoid any undesired
oscillation of the outputs.
Example 4: it’s necessary to stabilize the value of the dis-
played variable “VL1-N”, that varies from 222.0V and 224.0V,
continuing to have an indication of 4 digits. The parameters of
the digital filter must be set as follows:
• DISPLAY: 4 digits
• RANGE: the variable may have variations within the average
amplitude value equal to
±
0.4% of the full scale of the
variable (
±
0.4/100*250V=
±
1V). The parameter “range” that
is the action range of the digital filter, will be set at a value
which is slightly higher than the percentage amplitude of the
fluctuation: e.g.: 0.5%.
• COEFFICIENT: if the new value acquired by the instrument
is within the action range of the filter, the new displayed value
is calculated by summing (algebraically) to the previous
value the variation divided by the filtering coefficient. As a
consequence, a higher value of this coefficient results in a
higher settling time, that means a higher stability. The best
result is generally obtained by setting the filtering coefficient
at a value equal to at least 10 times the value of the range
parameter. In the example: 0,5*10=5. To enhance the stabil-
ity, you may also increase the filtering coefficient (values
within 1 and 255 only).
Useful information