Schneider Electric 4000 SETTING UP INDIVIDUAL HARMONIC CALCULATIONS

Appendix B—Using the Command Interface 6323 0-300-212

SettingUp IndividualHarmonic Calculations April 2001

190

Set up—Toset up incremental energy:

1. Write command code 9020 to register 8000.

2. In register 3230, write a start time (in minutes-from-midnight).

Forexample, 8:00 am is 480 minutes.

3. In register 3231, write an end time (in minutes-from-midnight).

4. Write the desired interval length, from 0–1440 minutes, to register3229.

If incrementalenergy will be controlled from a remote master, such asa

programmablecontroller, write 0 to the register.

5. Write 1 to register 8001.

6. Write command code 9021 to register 8000.

Start—Tostart a new incremental energyinterval from a remote master,

write command code 6910 toregister 8000.

The circuitmonitor can perform harmonic magnitude and angle calculations

foreach metered value and for each residualvalue. The harmonic magnitude

can be formattedas either a percentage of the fundamental (THD) or as a

percentageof the rms values (thd). The harmonic magnitude and angles are

stored in a setof registers:28,672–30,719. During the time that the circuit

monitoris refreshing harmonic data, the circuit monitor posts a valueof 0 in

register3245. When the set of harmonic registers is updated with new data,

thecircuit monitor posts a value of 1 in register 3245. The circuit monitor can

be configuredto hold the values in these registers for up to 60 metering

update cyclesonce the data processing is complete.

Thecircuit monitor has three operatingmodes for harmonic data processing:

disabled,magnitude only, and magnitude and angles. Becauseof the extra

processingtime necessary to perform these calculations,the factory default

operatingmode is magnitudes only.

Toconfigure the harmonic data processing, write to the registersdescribed

in Table B–3:

Tabl e B–3: Registers for Harmonic Calculations

RegNo. Value Description

3240 0, 1, 2

Harmonicprocessing;

0=disabled

1 =magnitudes only enabled

2 =magnitudes and angles enabled

3241 0, 1

Harmonic magnit ude formatting;

0 = % of fundamental (default)

1=%ofrms

3242 10–60seconds Harmonics RefreshInterval

Default= 30 seconds

3243 10–60seconds This regist er shows the time remaining be fore

thenext update (of harmonicdata).

3245 0,1

Thisregister indicateswhether harmonic data

processing is com plete:

0 =processing incomplete

1 =processing complete

SETTING UP INDIVIDUALHARMONIC CALCULATIONS