CARLO GAVAZZI WM4-96 - PROGRAMMING Manual de usuario descargar pdf (Pagina 21)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

WM4-96

V1 R3

Page

NOTE:

According to the selected electrical system, the voltages can be Phase to Phase Voltage or Phase

to Neutral Voltages.

Negligible values when the selected system is without neutral.

All the variables of the previous table are contiguous. Note that using a single read command it is

possible to read at most 120 words.

The values of the harmonic and distortion variables are represented as short (2 byte long). The

decimal point must be set to “111.1” for distortion and angle variables (THD, THDo, THDe), and to

“111.11” for the harmonic variables (h).

The stored values have physical meaning only if the harmonic analysis of the relevant phase is

enabled (please refer to the user manual for FFT enable function, see also EEPROM map, address

200Ch).

Example 17: reading of the VL1 3

order harmonic

“Value” request frame (frame 8 byte):

01h

04h

02h

5Ch

00h

01h

CRC

“Value” answer frame (frame 7 byte):

01h

04h

02h

13h

0Dh

CRC

Variable value: 0D13h 3347 (decimal)

Value format: 111.11

VL1 3

order harmonic value 33.47% (the display shows 33.4%)

Example 18: reading of the phase 1 - 3

order relative angle

“Value” read request frame (frame 8 byte):

01h

04h

02h

68h

00h

01h

CRC

“Value” read answer frame (frame 7 byte):

01h

04h

02h

EFh

06h

CRC

Variable value: 06EFh 1775 (decimal)

Value format: 111.1

Phase 1–3

order relative angle:177.5° (the display shows 177°)

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

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