Harmonic Analysis Page; Waveform Page; Energy Meters Page; Hour Counters Page - LOVATO ELECTRIC DMG800 Manuel D'application

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H RMONIC N LYSIS P GE
– The DMG800 provides the harmonic analysis up to the 31st order of the following measurements:
• phase-to-phase voltages
• phase-to-neutral voltages
• currents
– For each of these measurements, there is a display page that graphically represents the harmonic content (spectrum) through a bar graph.
– Every column is related to one harmonic order, even and odd. The first column shows the total harmonic distortion (THD).
– Every histogram bar is then divided into three parts, one each phase L1,L2, L3.
– The value of the harmonic content is expressed as a percentage with respect to the fundamental (system frequency).
– It is possible to show the harmonic content in numeric format, pressing
The lower part of the screen will display a little arrow that points to the selected column, and the relative percentage value of the three phases. Press
once more to leave numeric mode.
– The vertical scale of the graph is automatically selected among four full-scale values, depending on the column with the highest value.
1 - Numeric values of the selected order
ENERGY METERS P GE
– This page graphically views the waveform of the voltage and current signals read by the DMG800.
– It is possible to see one phase at a time, selecting it with
– The vertical scale (amplitude) is automatically scaled in order to fit the waveform on the screen in the best possible way.
– The horizontal axis (time) shows two consecutive periods referred to the fundamental frequency.
– The graph is automatically updated about every 1s.
ENERGY METERS P GE
– The Energy meters page shows the following meters simultaneously:
• active energy, Imported and exported
• reactive energy, imported and exported (inductive / capacitive)
• apparent energy.
– The main page shows the total meters. Pressing key
– To clear energy meters, it is necessary to access the commands menu.
1 - Total / Partial indication
HOUR COUNTERS P GE
– The Hour counters page shows the following meters simultaneously:
• total hour meter (counts the power-on time of the device)
• partial hour meter (counts how long a programmable condition has been true)
– To clear hour counters, it is necessary to access the commands menu.
– The hour counter page can be completely hidden if the general hour counter enable has been set to OFF (see hour counter menu).
TREND GR PH P GE
– The trend graph page allows to show the changes in the time domain of one measurement selectable among the following:
• average equivalent voltage
• average total active power
• average total reactive power
• average total apparent power.
– The default measurement is the verage total active power. To change the measurement, enter the dedicated menu parameter in the Trend sub-menu.
– It is possible to see, on the graph, the history of the last 96 values of the integrated measurement, each correspondent to a integration time interval.
– The default time interval is equal to 15 minutes, so the graph depth in time is equal to 24h.
– With the default factory setting, the trend graph shows the active power demand variation of the last day.
– The consumption data is lost when auxiliary power is removed from the DMG device or when the settings in the setup menu are changed.
– When the maximum storing capacity is exceeded, the newest data will overwrites the oldest, so that the most recent data is always shown.
– The vertical full-scale is calculated automatically, depending on the measurement selected and the highest value recorded in the setup menu.
1 - Time scale.
Indicates the time in the past to which
the measurements are referred.
2 - Vertical scale.
Can be autoranging or fixed by the user.
3 - Measurement viewed on graph
button to activate the cursor and then selecting the required order through s t.
key.
, the display moves to sub-page with partial meters (clearable by the user).
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