User Manual

Page 60
ELR 9000 Series
www.elektroautomatik.de
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EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
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Fax: +49 2162 / 16230
3.8.8 Trapezoidal function
The following parameters can be congured for a trapezoidal curve function:
Value Range Description
I(A), U(A) 0...(Nominal value - (Off)) of U, I A = Amplitude of the signal to be generated
I(Off), U(Off) 0...(Nominal value - (A)) of U, I Off = Offset, based on the foot of the trapezium
t1 0.1ms...36000s Time for the negative slope of the trapezoidal wave signal
t2 0.1ms...36000s Time for the top value of the trapezoidal wave signal
t3 0.1ms...36000s Time for the negative slope of the trapezoidal wave signal
t4 0.1ms...36000s Time for the base value (offset) of the trapezoidal wave signal
Schematic diagram: Application and result:
Offset
t
A
Amplitude
t1t2 t3 t4
Here a trapezoidal signal can be applied to a set value
of U or I. The slopes of the trapezium can be different
by setting different times for gain and decay.
The periodic duration and repeat frequency are the
result of four time elements. With suitable settings the
trapezium can be deformed to a triangular or rectangular
wave. It has, therefore, universal use.
3.8.9 DIN 40839 function
This function is based on the curve dened in DIN 40839 / EN ISO 7637 (test impulse 4), and is only applicable
to voltage. It shall replicate the progress of automobile battery voltage during engine starting. The curve is divided
into 5 sequences (see diagram below) which each have the same parameters. The standard values from the DIN
are set already as default values for the ve sequences.
The following parameters can be congured for the DIN40839 function:
Value Range Seq Description
Ustart 0...Nominal value of U 1-5 Start voltage of the ramp
Uend 0...Nominal value of U 1-5 End voltage of the ramp
Seq.time 0.1ms...36000s 1-5 Time of the ramp
Seq.cycles ∞ or 1...999 - Number of repetitions of the entire curve
Time t1 0.1ms...36000s - Time after cycle before repetition (cycle <> 1)
Schematic diagram: Application and result:
t
A
U start
1 2 3 4 5 t1
Sequences
The function is not suitable for standalone operation of
an electronic load, but optimal for an electronic load in
conjunction with a compatible power supply, e.g. from
the PS 9000 3U series, which is controlled by the load
via Share Bus (see power supply device manual and
„3.9.3. Two quadrant operation (2QO)“). The load acts
as a sink for the rapid fall of the output voltage of the
power supply enabling the output voltage progress to
follow the DIN curve.
The curve conforms to test impulse 4 of the DIN. With
suitable settings, other test impulses can be simulated.
If the curve in sequence 4 should be a sine wave, then
these 5 sequences have to be transferred to the arbitrary
generator.