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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
ELR 9000 HP Series
3.10.10 Arbitrary function
The arbitrary (freely definable) function offers the user further scope. There are 99 sequence points available for
use on current I or voltage U, all of which have the same parameters but which can be differently configured so
that a complex function process can be built up. The 99 sequence points can run one after another in a sequence
point block, and this block can then be repeated up to 999 times or endlessly. From the 99 sequence points a block
can be freely defined to run from point x to point y. A sequence point or sequence point block acts only on 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 both, start frequency (fs) and end frequency (fe) are 0 Hz, the AC values
have no impact and only the DC part is effective. Each sequence point is allocated a time in which the AC/DC
curve from start to finish will be generated.
The following parameters can be configured for each sequence point in the arbitrary function (the table lists pa
-
rameters for current, for voltage it would be Us, Ue etc.)
Value
Range
Description
Is(AC)
0...50% Nominal value of I
Start amplitude of the sine wave part of the curve (AC)
Ie(AC)
0...50% Nominal value of I
End amplitude of the sine wave part of the curve (AC)
fs(1/T)
0 Hz...10000 Hz
Start frequency of the sine wave part of the curve (AC)
fe(1/T)
0 Hz...10000 Hz
End frequency of the sine wave part of the curve (AC)
Angle
0 °...359 °
Start angle of the sine wave part of the curve (AC)
Is(DC)
Is(AC)...(Nominal value - Is(AC)) of I Start value of the DC part of the curve
Ie(DC)
Ie(AC)...(Nominal value - Ie(AC)) of I End value of the DC part of the curve
Seq.time 0.1 ms...36000 s
Sequence point time
The sequence point time (seq. time) and the start and end frequency are related. The minimum
value for
Δ
f/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
Δ
f/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.
Also 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 inapplicable setting.
After the settings for the selected sequence points are accepted with SAVE, further sequence points can be con-
figured. 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
Description
Start seq.
1...End seq.
First sequence point in the block
End seq.
Start seq...99
Last sequence point in the block
Seq. Cycles
∞ or 1...999
Number of cycles to run the block.
Schematic diagram:
Applications and results:
St
ar
t(
D
C
)
t
A
St
art
(A
C)
Seq.time
En
d
(D
C
)
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 the time was 1 s and the frequency 1 Hz,
there would be exactly 1 sine wave. If the time was 0.5 s at the same
frequency, there would only be a half sine wave.
