Schneider Electric PM810, PM870, PM820, PM850 manual Setting Up Individual Harmonic Calculations

PowerLogicTM Series 800 Power Meter	63230-500-225A2
Appendix C—Using the Command Interface	3/2011

Setting Up Individual Harmonic Calculations

The PM810 with a PM810LOG can perform up to the 31st harmonic magnitude and angle calculations for each metered value and for each residual value. The Power Meter can perform harmonic magnitude and angle calculations for each metered value and for each residual value. The harmonic magnitude for current and voltage can be formatted as either a percentage of the fundamental (THD), as a percentage of the rms values (thd), or rms. The harmonic magnitude and angles are stored in a set of registers: 13,200–14,608. During the time that the power meter is refreshing harmonic data, the power meter posts a value of 0 in register 3246. When the set of harmonic registers is updated with new data, the power meter posts a value of 1 in register 3246. The power meter can be configured to hold the values in these registers for up to 60 metering update cycles once the data processing is complete.

The power meter 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 C–4:

Table C–4: 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 for voltage;
3241	0, 1, 2	0	= % of fundamental (default)
		1	= % of rms
		2	= rms
		Harmonic magnitude formatting for current;
3242	0, 1, 2	0	= % of fundamental (default)
		1	= % of rms
		2	= rms
3243	10–60 seconds	This register shows the harmonics refresh interval
		(default is 30 seconds).
3244	0–60 seconds	This register shows the time remaining before the
		next harmonic data update.
		This register indicates whether harmonic data
3245	0,1	processing is complete:
		0	= processing incomplete
		1	= processing complete

Refer to “Register List Access” on page 79 for instructions on accessing the complete register list.

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