CARLO GAVAZZI WM23-96 - PROGRAMMING Manuel d'utilisateur télécharger pdf (Page 20)

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Useful Information

Mounting

Reset min and max values

tiples are automatically selected by the instrument accord-

ing to the selected VT and CT values;

• HiE: (maximum electrical scale) 100.0 K; the K and M

multiples are automatically selected by the instrument

according to the selected VT and CT values;

• LoA: (minimum electrical scale of the analogue output)

20.0% for 4mA, the calculation to be carried out is: (mini-

mum output value/ full scale output value)*100 =

(4mA/20mA)*100 = 20%

• HiA: (maximum electrical scale of the analogue output)

100.0% for 20mA, the calculation to be carried out is: (max-

imum output value / full scale output value)*100 =

(20mA/20mA)*100 =100%

Example 2 “Use of digital filter”: it’s necessary to stabilize

the displayed value of the VL1-N variable that varies

between 222V and 228V. The parameters of the digital filter

are to be set as follows:

• rnG: the variable varies within the average value, the

amplitude of which is equal to ±1.3% of the variable’s rated

value, calculated as follows:

(228-222)/2=±3V, then ±3*100/231V=±1.3% where 231V

is the phase-neutral rated value of a 400V input range). The

“range” parameter, that corresponds to the action range of

the digital filter, is set at a value which is slightly higher than

the percentage amplitude of the fluctuation: e.g. 2%.

• CoE: if the new value acquired by the instrument is with-

in the filter’s action range, then the new displayed value is

calculated by summing algebraically to the previous value

the variation divided by the filtering coefficient. As a conse-

quence, a value which is higher than this coefficient implies

a longer settling time and therefore improves the stability.

The latter can also be improved by increasing the filtering

coefficient: the admitted values are within 1 and 16. Enter the

value in consecutive attempts until you reach the desired

stability.

Gross Automation (877) 268-3700 · www.carlogavazzisales.com · [email protected]

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CARLO GAVAZZI WM23-96 - PROGRAMMING Manuel d'utilisateur Page 20