3.10.10 Arbitrary Function - Elektro-Automatik EL 9080-170 B Betriebsanleitung

3.10.10 Arbitrary function

The arbitrary i. e. freely definable function offers the user a wider scope. There are 99 sequence points available
for use on either current (I) or voltage (U) while having the same set of parameters which can be arbitrarily con-
figured, so that a complex function process can be built up. Any number of points can run one after another in a
block, freely defined from point x to y, and this block can then be repeated 1 to 999 times or endlessly. A point or
block can only be applied to current or voltage, thus a mix of assignment to current I or voltage U is not possible.
The arbitrary curve overlays a linear progression (DC) with a sine curve (AC), whose amplitude and frequency are
shaped between start and end values. If start frequency (fs) and end frequency (fe) are set to 0 Hz then the AC
values have no impact and only the DC part is effective. Each sequence point is allocated a sequence point time
in which the AC/DC curve will be generated from start to end values.
The following parameters can be configured for each sequence point in the arbitrary function:
Value Range
Is(AC) / Us(AC) 0...50% Nominal value of I or U
Ie(AC) / Ue(AC) 0...50% Nominal value of I or U
fs(1/T) 0 Hz...10000 Hz
fe(1/T) 0 Hz...10000 Hz
Angle 0°...359°
Is(DC) / Us(DC) Is(AC)...(rated value of I - Is(AC)) or
Us(AC)...(rated value of U - Us(AC))
Ie(DC) / Ue(DC) Ie(AC)...(rated value of I - Ie(AC)) or
Ue(AC)...(rated value of U - Ue(AC))
Seq.time 0.01 ms...36000 s
The sequence point time (seq. time) and the start and end frequency are related. The minimum
value for Δf/s is 9.3. Thus, for example, a setting of fs = 1 Hz, fe = 11 Hz and Seq.time = 5 s
would not be accepted as Δf/s is only 2. A seq. time of 1 s would be accepted, or, if the time
remains at 5 s, then fe = 51 Hz must be set.
The amplitude change between start and end is related to the sequence point time. A minimal
change over an extended time is not possible and in such a case the device will report an inap-
plicable setting.
After the settings for the selected sequence point are accepted with SAVE, further points can be configured. If the
button NEXT is touched a second settings screen appears in which global settings for all 99 points are displayed.
The following parameters can be set for the total run of an arbitrary function:
Value Range
Start seq. 1...Endseq.
End seq. Startseq. ... 99
Seq. Cycles ∞ or 1...999
Schematic diagram:
A
Seq.time
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Description
Start amplitude of the sine wave part (AC)
End amplitude of the sine wave part (AC)
Start frequency of the sine wave part (AC)
End frequency of the sine wave part (AC)
Start angle of the sine wave part (AC)
Start value of the DC part
End value of the DC part
Time of the sequence point
Description
First sequence point in the block
Last sequence point in the block
Number of cycles to run the block.
Applications and results:
Example 1
Focussing 1 cycle of 1 sequence point from 99
DC values for start and end are the same, also the AC amplitude.
With a frequency >0 a sine wave progression of the set value is
generated with a defined amplitude, frequency and Y shift (offset,
DC value at start and end)
The number of sine waves per cycle depend on the sequence point
time and the frequency. If time was 1 s and the frequency 1 Hz, there
would be exactly 1 sine wave. If the time were 0.5 s at the same
frequency, there would only be a half sine wave.
t
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Fax: +49 2162 / 16230
EL 9000 B Series
www.elektroautomatik.de
ea1974@elektroautomatik.de
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