CARLO GAVAZZI EN61036 Manual de usuario descargar pdf (Pagina 20)

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CT and VT programming; Open collector Pulse

Digital Output Table

The CT is programmable from 1 to 5000, the VT is program-

mable from 1.0 to 199.9 and from 200 to 1999 (CT*VT ratio

limited to 5000). The CT must be programmed before the VT

because the programming of VT depends on the CT value: if

the CT is modified, then the VT value can automatically satisfy

the expression: CT*VT≤5000. If the CT or VT values are

modified, then the display resolution of the variables and of the

“pul” (pulses) parameter changes automatically according to

the table on the following page.

When the CT or VT value is modified, then the energy meters

Useful information

Serial address

What is Asy

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

the displayed value of the V

L1-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 ampli-

tude of which is equal to ±1.3% of the variable’s rated value,

calculated as follows:

(228-222)/2=

, 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 within the

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

lated 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.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 39 40

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CARLO GAVAZZI EN61036 Manual de usuario Pagina 20

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