Schneider Electric 4000 manual Setting UP Individual Harmonic Calculations, 190

Appendix B—Using the Command Interface	63230-300-212
Setting Up Individual Harmonic Calculations	April 2001

SETTING UP INDIVIDUAL HARMONIC CALCULATIONS

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
		Harmonic processing;
3240	0, 1, 2	0	= disabled
		1	= magnitudes only enabled
		2	= magnitudes and angles enabled
		Harmonic magnitude formatting;
3241	0, 1	0 = % of fundamental (default)
		1	= % of rms
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).
		This register indicates whether harmonic data
3245	0,1	processing is complete:
		0	= processing incomplete
		1	= processing complete

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