5-7
IM 760201-01E
Power Measurement
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App
Index
Selecting the Number of Displayed Items
You can select the number of numeric data items that are displayed simultaneously from
the choices below.
• 4 Items
Four numeric data values are displayed in one column.
• 8 Items
Eight numeric data values are displayed in one column.
• 16 Items
Sixteen numeric data values are displayed in two columns.
• Matrix/All Items
A table of numeric data is displayed with measurement functions listed vertically
and symbols indicating elements and wiring units listed horizontally. The number of
displayed items varies depending on the number of elements that are installed in the
WT500. In the Matrix display, the displayed items (measurement functions) can be
changed. In the All Items display, the displayed items cannot be changed, so scroll
through the pages to change the displayed items.
• Single List
*
The numeric values of a single measurement function are displayed in two columns,
with a total of 42 items listed on a page.
• Dual List
*
The numeric values of two measurement functions are displayed in two separate
columns, with a total of 22 items in each column.
* This item only appears on models with the harmonic measurement option. For instructions on
how to change the displayed items in the Single List and Dual List displays, see chapter 6.
Note
• “-------” is displayed if a measurement function is not selected or if there is no numeric data.
• If Urms, Umn, Udc, Urmn, Uac, Irms, Imn, Idc, Irmn, or Iac exceeds 140% of the
measurement range, “-OL-” (for over range) is displayed.
• If the voltage or current exceeds 140% of the measurement range, “-OL-” (for over range) is
displayed for P.
• If the measured or computed result cannot be displayed using the specified decimal place or
unit, “-OF-” (for overflow) is displayed.
• If Urms, Uac, Irms, or Iac is less than or equal to 0.5% (when the crest factor is set to 3, less
than or equal to 1.0% if the crest factor is set to 6) or Umn, Urmn, Imn, or Irmn is less than
or equal to 2% of the measurement range (when the crest factor is set to 3, less than or
equal to 4% if the crest factor is set to 6), the values of Urms, Umn, Urmn, Irms, Imn, Irmn,
and the measurement functions that are determined using these measurement functions are
zero. The
λ
and
f
functions will return errors (“Error” is displayed).
• If the analysis window width (number of cycles of the fundamental signal) that is determined
by the fundamental frequency is shorter than the data update interval, harmonic data is not
measured, and “-------” (no data) is displayed. If this happens, decrease the data update
rate. For example, if the fundamental frequency is 10 Hz (100-ms cycle), the analysis
window width is 1 wave (see section 14.6 for details), and the data measurement interval
is 100 ms. In this case, the time required for harmonic measurement is approximately 150
ms or greater (data measurement in data processing time). To measure and display
harmonic data, set the data update rate to a value greater than or equal to 200 ms.
• If the measured frequency is outside the measurement range, the fU or fI function returns an
error (“Error” is displayed).
• If the power factor
λ
is greater than 1 and less than or equal to 2,
λ
returns 1.
f
returns
zero.
• If
λ
is greater than 2,
λ
and
f
return errors (“Error” is displayed).
• In the Matrix display, if you select a measurement function (
η
1,
η
2, or F1 to F8) that does
not require an element or wiring unit, the data for that function appears in the Element 1
column.
5.2 Displaying Numeric Data and Changing Displayed Items
Содержание WT500
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