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In the RMS display, the available information is:
● The instantaneous frequency at the time indicated by the cursor.
● The minimum, mean, and maximum instantaneous values of the frequency over the entire capture.
● The RMS current and voltage in the half-cycle (or lobe) on which the cursor is positioned.
● The maximum half-cycle RMS current and voltage (over the entire capture).
A voltage must be present on the phase before the motor start-up for a stable and correct frequency control.
4.1.3 TRUE RMS CURRENT AND VOLTAGE
The RMS mode displays the record of the trend of the true half-cycle RMS current and voltage and the frequency trend
curve.
4.1.3.1 RMS DISPLAY SCREEN (3A)
Item Function
1
Instantaneous value cursor; change values with the cursor using the ◄ and ► buttons
2
Scale of values
- Maximum half-period RMS value of the Inrush current capture
3
- Indicator of number attributed to the displayed curve
- Value of the measured current
Selection of curves to be displayed:
- 3V: displays the 3 voltages during the Inrush current capture
4
- 3A: displays the 3 phase currents during the Inrush current capture
- L1, L2, L3: display the current and voltage in phases 1, 2, and 3, respectively
- Hz: displays the evolution of the network frequency vs time
- t: relative time position of the cursor
5
(t = 0 corresponds to the start of the Inrush capture)
- Values at the position of the cursor. In the example shown in Figure 4-8, A1, A2, and A3 are the RMS values of currents 1, 2, and 3.
: Zoom Out - Zooms out on the graph at the current cursor position
6
: Zoom In - Zooms in on the graph at the current cursor position
Power Quality Analyzer PowerPad
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®
III Model 8435
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Figure 4-8
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