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PowerLogic™ PM5100 series user guide Chapter 9—Power quality
© 2014 Schneider Electric All Rights Reserved 69
The vertical axis of the harmonics graph indicates the harmonic’s magnitude as a
percentage of the fundamental harmonic, and is scaled based on the largest
harmonic displayed. At the top of each vertical bar is a marker that shows the
maximum value of the harmonic. If the harmonic is greater than the fundamental
harmonic, this marker is triangular-shaped to show that the value is out of range.
Viewing TDD
1. Navigate to Harm > TDD. The Total demand distortion information displays.
NOTE: Your meter’s Modbus map includes registers for harmonics data for
integration into your power or energy management system.
2. Press to return to the main display screens.
Related topics
• See “Front panel display and meter setup” on page 29 for front panel menu
navigation details.
• Search PM5100 Modbus register list at www.schneider-electric.com to download
the Modbus map.
Viewing THD/thd using the front panel
You can view THD/thd data using the front panel.
1. Navigate to THD. On the THD/thd Select screen, press THD to display values that
use the calculation method based on the fundamental harmonic, or thd to display
values that use the calculation method based on the RMS value of all harmonics in
that phase (including the fundamental).
2. Press the current or voltage THD or thd values you want to view. The total harmonic
distortion percentage values are displayed.
3. Press to return to the main display screens.
NOTE: Your meter’s Modbus map includes registers for total harmonic distortion data
for integration into your power or energy management system.
Example: 7th to 15th harmonics for line-to-neutral voltage
Phase A
Phase B
Phase C
Power Quality display screen
IEEE mode IEC mode Description
TDD TDD Total demand distortion
THD (or thd) display screens
IEEE mode IEC mode Description
Amps I Total harmonic distortion data for per phase and neutral currents.
V L-L U Total harmonic distortion data line-to-line voltage.
V L-N V Total harmonic distortion data line-to-neutral voltage.