Reading individual harmonic values – Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, Firmware rev. 3.0 or LATER User Manual

Page 173

Publication 1404-UM001F-EN-P - November 2009

173

Advanced Features Chapter 8

•

TIF: Telephone influence factor. Range 0.0…999.9*10

•

K-factor: Range 0.0…999.9*10

•

IEEE-519 TDD: Total demand distortion. Range 0.0…999.9*10

•

IEEE-519 Pass/fail: -1 = unknown, 0 = fail, 1 = pass

•

FFT iteration: each new FFT calculation (used in the previous
four parameters) increments by one from 0…32,767 and rolls
back to 0

A data client may determine the relative freshness of data by
comparing the THD & crest iteration or FFT iteration parameters in
repeated reads of this table.

Reading Individual Harmonic Values

The M6 and M8 models provide several data tables containing
individual harmonic results. Individual harmonic value data is not
available via Modbus communication. Write to the

Harmonic Analysis

Configuration/Read-back Select

table to select the Read-back mode,

data type (magnitude or distortion per cent) and/or channel number
of harmonic data. A data client reads the tables listed below in
indexed Read-back mode to obtain individual harmonic data. In
Auto-increment mode, read the

Harmonic Results; THD, Crest Factor,

and More

table to index the channel.

•

Harmonic Results; Odd Harmonics 1…21

Table (M6 and M8)

•

Harmonic Results; Odd Harmonics 23…41

Table (M6 and M8)

•

Harmonic Results; Even Harmonics 2…20

Table (M6 and M8)