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Appendix B—Using the Command Interface 63230-300-212
Setting Up Individual Harmonic Calculations April 2001
© 2001 Schneider Electric All Rights Reserved
190
Set up—To set up incremental energy:
1. Write command code 9020 to register 8000.
2. In register 3230, write a start time (in minutes-from-midnight).
For example, 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 register 3229.
If incremental energy will be controlled from a remote master, such as a
programmable controller, write 0 to the register.
5. Write 1 to register 8001.
6. Write command code 9021 to register 8000.
Start—To start a new incremental energy interval from a remote master,
write command code 6910 to register 8000.
The circuit monitor can perform harmonic magnitude and angle calculations
for each metered value and for each residual value. The harmonic magnitude
can be formatted as either a percentage of the fundamental (THD) or as a
percentage of the rms values (thd). The harmonic magnitude and angles are
stored in a set of registers: 28,672–30,719. During the time that the circuit
monitor is refreshing harmonic data, the circuit monitor posts a value of 0 in
register 3245. When the set of harmonic registers is updated with new data,
the circuit monitor posts a value of 1 in register 3245. The circuit monitor can
be configured to hold the values in these registers for up to 60 metering
update cycles once the data processing is complete.
The circuit monitor has three operating modes for harmonic data processing:
disabled, magnitude only, and magnitude and angles. Because of the extra
processing time necessary to perform these calculations, the factory default
operating mode is magnitudes only.
To configure the harmonic data processing, write to the registers described
in Table B– 3:
Table B– 3: Registers for Harmonic Calculations
Reg No. Value Description
3240 0, 1, 2
Harmonic processing;
0=disabled
1 = magnitudes only enabled
2 = magnitudes and angles enabled
3241 0, 1
Harmonic magnitude formatting;
0 = % of fundamental (default)
1=%ofrms
3242 10–60 seconds
Harmonics Refresh Interval
Default = 30 seconds
3243 10–60 seconds
This register shows the time remaining before
the next update (of harmonic data).
3245 0,1
This register indicates whether harmonic data
processing is complete:
0 = processing incomplete
1 = processing complete
SETTING UP INDIVIDUAL
HARMONIC CALCULATIONS