Manual

92 Rockwell Automation Publication 1426-UM001F-EN-P - November 2013
Chapter 5 Power Quality Monitoring
These bitfields reports the short-term or long-term status of harmonics of order
18
…33.
0 = PASS
1 = FAIL
• Bit0 - 18th_Harmonic_PASS_FAIL
• Bit1 - 19th_Harmonic_PASS_FAIL
• …
• Bit15 - 33rd_Harmonic_PASS_FAIL
• ShortTerm_34th_To_40th_Harmonic_Status
• LongTerm_34th_To_40th_Harmonic_Status
These bitfields reports the short-term or long-term status of harmonics of order
34 through 40.
0 = PASS
1 = FAIL
• Bit0 - 34th_Harmonic_PASS_FAIL
• Bit1 - 35th_Harmonic_PASS_FAIL
• …
• Bit6 - 40th_Harmonic_PASS_FAIL
• Bit 7 … Bit 15 - Reserved, always = 0
IEEE-519 Short Term and
Long Term Harmonic Results
The six data tables listed below provide an indication of individual current
harmonic distortion and TDD (Total Demand Distortion). If the user has
selected voltage as the output parameter the tables list voltage distortions and
THD (Total Harmonic Distortion).
• PowerQuality.IEEE519_CH1_ShortTerm_Results
• PowerQuality.IEEE519_CH2_ShortTerm_Results
• PowerQuality.IEEE519_CH3_ShortTerm_Results
• PowerQuality.IEEE519_CH1_LongTerm_Results
• PowerQuality.IEEE519_CH2_LongTerm_Results
• PowerQuality.IEEE519_CH3_LongTerm_Results
Each table provides the following:
• Timestamp of the most recent results
• Fundamental magnitude
• Individual harmonic distortion as a percentage of the fundamental
magnitude
• Overall distortion
– With current selected as the compliance parameter (default), if the
IEEE519_MAX_Isc and IEEE519_MAX_IL parameter values are
non-zero, then TDD is returned. Otherwise, THD is returned.